Delayed start problem
Guest
Posts: n/a
Re: Delayed start problem
On Sep 26, 10:21 am, nrs <neale...@yahoo.com> wrote:
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
I took it to the dealership today for diagnostic check just to make
sure but at this point I'll most likely have to buy a computer.
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
I took it to the dealership today for diagnostic check just to make
sure but at this point I'll most likely have to buy a computer.
Guest
Posts: n/a
Re: Delayed start problem
On Sep 26, 10:21 am, nrs <neale...@yahoo.com> wrote:
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
I took it to the dealership today for diagnostic check just to make
sure but at this point I'll most likely have to buy a computer.
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
I took it to the dealership today for diagnostic check just to make
sure but at this point I'll most likely have to buy a computer.
Guest
Posts: n/a
Re: Delayed start problem
On Sep 26, 10:21 am, nrs <neale...@yahoo.com> wrote:
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
I took it to the dealership today for diagnostic check just to make
sure but at this point I'll most likely have to buy a computer.
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
I took it to the dealership today for diagnostic check just to make
sure but at this point I'll most likely have to buy a computer.
Guest
Posts: n/a
Re: Delayed start problem
On Oct 1, 10:17 pm, "Earle Horton" <el_anglo_burg...@usa.com> wrote:
> "nrs" <neale...@yahoo.com> wrote in message
>
> news:1191283935.387886.127120@19g2000hsx.googlegro ups.com...
>
>
>
> > On 1 oct, 12:22, Mike Romain <roma...@sympatico.ca> wrote:
> > > nrs wrote:
> > > > On Oct 1, 10:03 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >> nrs wrote:
> > > >>> On Sep 27, 11:02 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >>>> nrs wrote:
> > > >>>>> My '95 2.5 AX5 YJ has a strange problem, usually in the morning
> when
> > > >>>>> it is cool. When the key is turned to run, the check engine light
> > > >>>>> does not turn on right away. There is a delay of a few seconds
> and
> > > >>>>> then the relays in the power distribution box under the hood start
> to
> > > >>>>> click rapidly. Once this happens, the fuel pump runs for a short
> > > >>>>> while and the jeep can be started. It seems like the computer is
> not
> > > >>>>> aware right away that the ignition has been turned to run. If I
> > > >>>>> immediately turn the key to run again (after first returning it to
> > > >>>>> lock) the check engine and fuel pump turn on normally. After
> letting
> > > >>>>> the jeep sit turned off for about 5-10 minutes, the problem will
> > > >>>>> return. Later in the day when it is hot, this almost never happens
> but
> > > >>>>> it does once in a long while, usually after sitting turned off for
> at
> > > >>>>> least a few hours. What could be causing this? What could cause
> it to
> > > >>>>> work fine on the second try?
> > > >>>>> Thanks
> > > >>>> One more thought for you.
> > > >>>> There is a recall on your emergency brake lever and the ground for
> the
> > > >>>> fuel pump bolts onto the frame of this lever on your 95 YJ. There
> have
> > > >>>> been posted 'fuel pump' and 'ECM' 'failures' right after this job
> is
> > > >>>> done if the wire doesn't get hooked back up. Maybe your ground
> there is
> > > >>>> bad?
> > > >>>> Mike
> > > >>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > >>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> > > >>>> Canadian Off Road Trips Photos: Non members can still view!
> > > >>>> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> > > >>>> (More Off Road album links at bottom of the view page)- Hide quoted
> text -
> > > >>>> - Show quoted text -
> > > >>> The FSM says that not all '95 YJs have this ground wire. Mine
> doesn't
> > > >>> seem to have it (but it still worked fine for a long time before
> this
> > > >>> problem started).
> > > >> One more idea for you I just remembered.
>
> > > >> I have had a bad fuse connection cause a 'no red dash light means no
> > > >> start' issue on several vehicles over the years. It was corrosion on
> > > >> the fuse's legs and their socket causing it.
>
> > > >> Mike- Hide quoted text -
>
> > > >> - Show quoted text -
>
> > > > Mike,
>
> > > > How likely do you think it is that this could be due to a bad PCM?
> > > > Can computer faults be made worse by cool weather?
>
> > > > Thanks
>
> > > I live in the rust belt in Canada.
>
> > > Rusty connections are 'very' temperature dependent and one always finds
> > > out the battery connections need cleaning after the first cold snap,
> > > never before.
>
> > > Have you check the computer's plug for a green pin or green socket? A
> > > green stain means a corroded connection.
>
> > > The oxidized fuse leg is also very common up here. My wife and I were
> > > just comparing notes on that and I think we have had 4 vehicles in the
> > > last 20 years that had that 'no start and no lights' issue including our
> > > Cherokee. On one Volvo 240 is was the fuel pump fuse, the others were
> > > low power ones like for the ignition module.
>
> > > Mike- Ocultar texto de la cita -
>
> > > - Mostrar texto de la cita -
>
> > Although I live in Monterrey, Mexico my jeep comes from Pennsylvania
> > so it has seen it's share of snow and rust!
> > I checked the PCM connector this morning and nothing looked green. I
> > still need to re-check the fuses although I did take out and replace
> > every one. I sure hope it isn't the PCM. Thanks
>
> Power to fuel pump? That's just something I thought of. From the manual I
> have, it looks hard to get to. There's a check valve or something, where
> the fuel rail pressure can leak down too. It would at least be interesting
> to put a pressure gauge on the fuel system and see what it does when all
> this is going on. We're looking for something that deteriorates with time.
> Once an AC mechanic told me that O-rings can shrink and leak refrigerant in
> the cold, then be OK at normal temperature. He was pulling my leg, just too
> stupid and lazy to expose the rear AC unit, but it bears some thinking.
>
> Cheers,
>
> Earle- Hide quoted text -
>
> - Show quoted text -
It also crossed my mind that maybe the fuel pump or something else in
the system was loading the electrical system, causing the delay
somehow but I think that would probably blow a fuse first which it has
not done.
> "nrs" <neale...@yahoo.com> wrote in message
>
> news:1191283935.387886.127120@19g2000hsx.googlegro ups.com...
>
>
>
> > On 1 oct, 12:22, Mike Romain <roma...@sympatico.ca> wrote:
> > > nrs wrote:
> > > > On Oct 1, 10:03 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >> nrs wrote:
> > > >>> On Sep 27, 11:02 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >>>> nrs wrote:
> > > >>>>> My '95 2.5 AX5 YJ has a strange problem, usually in the morning
> when
> > > >>>>> it is cool. When the key is turned to run, the check engine light
> > > >>>>> does not turn on right away. There is a delay of a few seconds
> and
> > > >>>>> then the relays in the power distribution box under the hood start
> to
> > > >>>>> click rapidly. Once this happens, the fuel pump runs for a short
> > > >>>>> while and the jeep can be started. It seems like the computer is
> not
> > > >>>>> aware right away that the ignition has been turned to run. If I
> > > >>>>> immediately turn the key to run again (after first returning it to
> > > >>>>> lock) the check engine and fuel pump turn on normally. After
> letting
> > > >>>>> the jeep sit turned off for about 5-10 minutes, the problem will
> > > >>>>> return. Later in the day when it is hot, this almost never happens
> but
> > > >>>>> it does once in a long while, usually after sitting turned off for
> at
> > > >>>>> least a few hours. What could be causing this? What could cause
> it to
> > > >>>>> work fine on the second try?
> > > >>>>> Thanks
> > > >>>> One more thought for you.
> > > >>>> There is a recall on your emergency brake lever and the ground for
> the
> > > >>>> fuel pump bolts onto the frame of this lever on your 95 YJ. There
> have
> > > >>>> been posted 'fuel pump' and 'ECM' 'failures' right after this job
> is
> > > >>>> done if the wire doesn't get hooked back up. Maybe your ground
> there is
> > > >>>> bad?
> > > >>>> Mike
> > > >>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > >>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> > > >>>> Canadian Off Road Trips Photos: Non members can still view!
> > > >>>> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> > > >>>> (More Off Road album links at bottom of the view page)- Hide quoted
> text -
> > > >>>> - Show quoted text -
> > > >>> The FSM says that not all '95 YJs have this ground wire. Mine
> doesn't
> > > >>> seem to have it (but it still worked fine for a long time before
> this
> > > >>> problem started).
> > > >> One more idea for you I just remembered.
>
> > > >> I have had a bad fuse connection cause a 'no red dash light means no
> > > >> start' issue on several vehicles over the years. It was corrosion on
> > > >> the fuse's legs and their socket causing it.
>
> > > >> Mike- Hide quoted text -
>
> > > >> - Show quoted text -
>
> > > > Mike,
>
> > > > How likely do you think it is that this could be due to a bad PCM?
> > > > Can computer faults be made worse by cool weather?
>
> > > > Thanks
>
> > > I live in the rust belt in Canada.
>
> > > Rusty connections are 'very' temperature dependent and one always finds
> > > out the battery connections need cleaning after the first cold snap,
> > > never before.
>
> > > Have you check the computer's plug for a green pin or green socket? A
> > > green stain means a corroded connection.
>
> > > The oxidized fuse leg is also very common up here. My wife and I were
> > > just comparing notes on that and I think we have had 4 vehicles in the
> > > last 20 years that had that 'no start and no lights' issue including our
> > > Cherokee. On one Volvo 240 is was the fuel pump fuse, the others were
> > > low power ones like for the ignition module.
>
> > > Mike- Ocultar texto de la cita -
>
> > > - Mostrar texto de la cita -
>
> > Although I live in Monterrey, Mexico my jeep comes from Pennsylvania
> > so it has seen it's share of snow and rust!
> > I checked the PCM connector this morning and nothing looked green. I
> > still need to re-check the fuses although I did take out and replace
> > every one. I sure hope it isn't the PCM. Thanks
>
> Power to fuel pump? That's just something I thought of. From the manual I
> have, it looks hard to get to. There's a check valve or something, where
> the fuel rail pressure can leak down too. It would at least be interesting
> to put a pressure gauge on the fuel system and see what it does when all
> this is going on. We're looking for something that deteriorates with time.
> Once an AC mechanic told me that O-rings can shrink and leak refrigerant in
> the cold, then be OK at normal temperature. He was pulling my leg, just too
> stupid and lazy to expose the rear AC unit, but it bears some thinking.
>
> Cheers,
>
> Earle- Hide quoted text -
>
> - Show quoted text -
It also crossed my mind that maybe the fuel pump or something else in
the system was loading the electrical system, causing the delay
somehow but I think that would probably blow a fuse first which it has
not done.
Guest
Posts: n/a
Re: Delayed start problem
On Oct 1, 10:17 pm, "Earle Horton" <el_anglo_burg...@usa.com> wrote:
> "nrs" <neale...@yahoo.com> wrote in message
>
> news:1191283935.387886.127120@19g2000hsx.googlegro ups.com...
>
>
>
> > On 1 oct, 12:22, Mike Romain <roma...@sympatico.ca> wrote:
> > > nrs wrote:
> > > > On Oct 1, 10:03 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >> nrs wrote:
> > > >>> On Sep 27, 11:02 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >>>> nrs wrote:
> > > >>>>> My '95 2.5 AX5 YJ has a strange problem, usually in the morning
> when
> > > >>>>> it is cool. When the key is turned to run, the check engine light
> > > >>>>> does not turn on right away. There is a delay of a few seconds
> and
> > > >>>>> then the relays in the power distribution box under the hood start
> to
> > > >>>>> click rapidly. Once this happens, the fuel pump runs for a short
> > > >>>>> while and the jeep can be started. It seems like the computer is
> not
> > > >>>>> aware right away that the ignition has been turned to run. If I
> > > >>>>> immediately turn the key to run again (after first returning it to
> > > >>>>> lock) the check engine and fuel pump turn on normally. After
> letting
> > > >>>>> the jeep sit turned off for about 5-10 minutes, the problem will
> > > >>>>> return. Later in the day when it is hot, this almost never happens
> but
> > > >>>>> it does once in a long while, usually after sitting turned off for
> at
> > > >>>>> least a few hours. What could be causing this? What could cause
> it to
> > > >>>>> work fine on the second try?
> > > >>>>> Thanks
> > > >>>> One more thought for you.
> > > >>>> There is a recall on your emergency brake lever and the ground for
> the
> > > >>>> fuel pump bolts onto the frame of this lever on your 95 YJ. There
> have
> > > >>>> been posted 'fuel pump' and 'ECM' 'failures' right after this job
> is
> > > >>>> done if the wire doesn't get hooked back up. Maybe your ground
> there is
> > > >>>> bad?
> > > >>>> Mike
> > > >>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > >>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> > > >>>> Canadian Off Road Trips Photos: Non members can still view!
> > > >>>> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> > > >>>> (More Off Road album links at bottom of the view page)- Hide quoted
> text -
> > > >>>> - Show quoted text -
> > > >>> The FSM says that not all '95 YJs have this ground wire. Mine
> doesn't
> > > >>> seem to have it (but it still worked fine for a long time before
> this
> > > >>> problem started).
> > > >> One more idea for you I just remembered.
>
> > > >> I have had a bad fuse connection cause a 'no red dash light means no
> > > >> start' issue on several vehicles over the years. It was corrosion on
> > > >> the fuse's legs and their socket causing it.
>
> > > >> Mike- Hide quoted text -
>
> > > >> - Show quoted text -
>
> > > > Mike,
>
> > > > How likely do you think it is that this could be due to a bad PCM?
> > > > Can computer faults be made worse by cool weather?
>
> > > > Thanks
>
> > > I live in the rust belt in Canada.
>
> > > Rusty connections are 'very' temperature dependent and one always finds
> > > out the battery connections need cleaning after the first cold snap,
> > > never before.
>
> > > Have you check the computer's plug for a green pin or green socket? A
> > > green stain means a corroded connection.
>
> > > The oxidized fuse leg is also very common up here. My wife and I were
> > > just comparing notes on that and I think we have had 4 vehicles in the
> > > last 20 years that had that 'no start and no lights' issue including our
> > > Cherokee. On one Volvo 240 is was the fuel pump fuse, the others were
> > > low power ones like for the ignition module.
>
> > > Mike- Ocultar texto de la cita -
>
> > > - Mostrar texto de la cita -
>
> > Although I live in Monterrey, Mexico my jeep comes from Pennsylvania
> > so it has seen it's share of snow and rust!
> > I checked the PCM connector this morning and nothing looked green. I
> > still need to re-check the fuses although I did take out and replace
> > every one. I sure hope it isn't the PCM. Thanks
>
> Power to fuel pump? That's just something I thought of. From the manual I
> have, it looks hard to get to. There's a check valve or something, where
> the fuel rail pressure can leak down too. It would at least be interesting
> to put a pressure gauge on the fuel system and see what it does when all
> this is going on. We're looking for something that deteriorates with time.
> Once an AC mechanic told me that O-rings can shrink and leak refrigerant in
> the cold, then be OK at normal temperature. He was pulling my leg, just too
> stupid and lazy to expose the rear AC unit, but it bears some thinking.
>
> Cheers,
>
> Earle- Hide quoted text -
>
> - Show quoted text -
It also crossed my mind that maybe the fuel pump or something else in
the system was loading the electrical system, causing the delay
somehow but I think that would probably blow a fuse first which it has
not done.
> "nrs" <neale...@yahoo.com> wrote in message
>
> news:1191283935.387886.127120@19g2000hsx.googlegro ups.com...
>
>
>
> > On 1 oct, 12:22, Mike Romain <roma...@sympatico.ca> wrote:
> > > nrs wrote:
> > > > On Oct 1, 10:03 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >> nrs wrote:
> > > >>> On Sep 27, 11:02 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >>>> nrs wrote:
> > > >>>>> My '95 2.5 AX5 YJ has a strange problem, usually in the morning
> when
> > > >>>>> it is cool. When the key is turned to run, the check engine light
> > > >>>>> does not turn on right away. There is a delay of a few seconds
> and
> > > >>>>> then the relays in the power distribution box under the hood start
> to
> > > >>>>> click rapidly. Once this happens, the fuel pump runs for a short
> > > >>>>> while and the jeep can be started. It seems like the computer is
> not
> > > >>>>> aware right away that the ignition has been turned to run. If I
> > > >>>>> immediately turn the key to run again (after first returning it to
> > > >>>>> lock) the check engine and fuel pump turn on normally. After
> letting
> > > >>>>> the jeep sit turned off for about 5-10 minutes, the problem will
> > > >>>>> return. Later in the day when it is hot, this almost never happens
> but
> > > >>>>> it does once in a long while, usually after sitting turned off for
> at
> > > >>>>> least a few hours. What could be causing this? What could cause
> it to
> > > >>>>> work fine on the second try?
> > > >>>>> Thanks
> > > >>>> One more thought for you.
> > > >>>> There is a recall on your emergency brake lever and the ground for
> the
> > > >>>> fuel pump bolts onto the frame of this lever on your 95 YJ. There
> have
> > > >>>> been posted 'fuel pump' and 'ECM' 'failures' right after this job
> is
> > > >>>> done if the wire doesn't get hooked back up. Maybe your ground
> there is
> > > >>>> bad?
> > > >>>> Mike
> > > >>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > >>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> > > >>>> Canadian Off Road Trips Photos: Non members can still view!
> > > >>>> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> > > >>>> (More Off Road album links at bottom of the view page)- Hide quoted
> text -
> > > >>>> - Show quoted text -
> > > >>> The FSM says that not all '95 YJs have this ground wire. Mine
> doesn't
> > > >>> seem to have it (but it still worked fine for a long time before
> this
> > > >>> problem started).
> > > >> One more idea for you I just remembered.
>
> > > >> I have had a bad fuse connection cause a 'no red dash light means no
> > > >> start' issue on several vehicles over the years. It was corrosion on
> > > >> the fuse's legs and their socket causing it.
>
> > > >> Mike- Hide quoted text -
>
> > > >> - Show quoted text -
>
> > > > Mike,
>
> > > > How likely do you think it is that this could be due to a bad PCM?
> > > > Can computer faults be made worse by cool weather?
>
> > > > Thanks
>
> > > I live in the rust belt in Canada.
>
> > > Rusty connections are 'very' temperature dependent and one always finds
> > > out the battery connections need cleaning after the first cold snap,
> > > never before.
>
> > > Have you check the computer's plug for a green pin or green socket? A
> > > green stain means a corroded connection.
>
> > > The oxidized fuse leg is also very common up here. My wife and I were
> > > just comparing notes on that and I think we have had 4 vehicles in the
> > > last 20 years that had that 'no start and no lights' issue including our
> > > Cherokee. On one Volvo 240 is was the fuel pump fuse, the others were
> > > low power ones like for the ignition module.
>
> > > Mike- Ocultar texto de la cita -
>
> > > - Mostrar texto de la cita -
>
> > Although I live in Monterrey, Mexico my jeep comes from Pennsylvania
> > so it has seen it's share of snow and rust!
> > I checked the PCM connector this morning and nothing looked green. I
> > still need to re-check the fuses although I did take out and replace
> > every one. I sure hope it isn't the PCM. Thanks
>
> Power to fuel pump? That's just something I thought of. From the manual I
> have, it looks hard to get to. There's a check valve or something, where
> the fuel rail pressure can leak down too. It would at least be interesting
> to put a pressure gauge on the fuel system and see what it does when all
> this is going on. We're looking for something that deteriorates with time.
> Once an AC mechanic told me that O-rings can shrink and leak refrigerant in
> the cold, then be OK at normal temperature. He was pulling my leg, just too
> stupid and lazy to expose the rear AC unit, but it bears some thinking.
>
> Cheers,
>
> Earle- Hide quoted text -
>
> - Show quoted text -
It also crossed my mind that maybe the fuel pump or something else in
the system was loading the electrical system, causing the delay
somehow but I think that would probably blow a fuse first which it has
not done.
Guest
Posts: n/a
Re: Delayed start problem
On Oct 1, 10:17 pm, "Earle Horton" <el_anglo_burg...@usa.com> wrote:
> "nrs" <neale...@yahoo.com> wrote in message
>
> news:1191283935.387886.127120@19g2000hsx.googlegro ups.com...
>
>
>
> > On 1 oct, 12:22, Mike Romain <roma...@sympatico.ca> wrote:
> > > nrs wrote:
> > > > On Oct 1, 10:03 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >> nrs wrote:
> > > >>> On Sep 27, 11:02 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >>>> nrs wrote:
> > > >>>>> My '95 2.5 AX5 YJ has a strange problem, usually in the morning
> when
> > > >>>>> it is cool. When the key is turned to run, the check engine light
> > > >>>>> does not turn on right away. There is a delay of a few seconds
> and
> > > >>>>> then the relays in the power distribution box under the hood start
> to
> > > >>>>> click rapidly. Once this happens, the fuel pump runs for a short
> > > >>>>> while and the jeep can be started. It seems like the computer is
> not
> > > >>>>> aware right away that the ignition has been turned to run. If I
> > > >>>>> immediately turn the key to run again (after first returning it to
> > > >>>>> lock) the check engine and fuel pump turn on normally. After
> letting
> > > >>>>> the jeep sit turned off for about 5-10 minutes, the problem will
> > > >>>>> return. Later in the day when it is hot, this almost never happens
> but
> > > >>>>> it does once in a long while, usually after sitting turned off for
> at
> > > >>>>> least a few hours. What could be causing this? What could cause
> it to
> > > >>>>> work fine on the second try?
> > > >>>>> Thanks
> > > >>>> One more thought for you.
> > > >>>> There is a recall on your emergency brake lever and the ground for
> the
> > > >>>> fuel pump bolts onto the frame of this lever on your 95 YJ. There
> have
> > > >>>> been posted 'fuel pump' and 'ECM' 'failures' right after this job
> is
> > > >>>> done if the wire doesn't get hooked back up. Maybe your ground
> there is
> > > >>>> bad?
> > > >>>> Mike
> > > >>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > >>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> > > >>>> Canadian Off Road Trips Photos: Non members can still view!
> > > >>>> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> > > >>>> (More Off Road album links at bottom of the view page)- Hide quoted
> text -
> > > >>>> - Show quoted text -
> > > >>> The FSM says that not all '95 YJs have this ground wire. Mine
> doesn't
> > > >>> seem to have it (but it still worked fine for a long time before
> this
> > > >>> problem started).
> > > >> One more idea for you I just remembered.
>
> > > >> I have had a bad fuse connection cause a 'no red dash light means no
> > > >> start' issue on several vehicles over the years. It was corrosion on
> > > >> the fuse's legs and their socket causing it.
>
> > > >> Mike- Hide quoted text -
>
> > > >> - Show quoted text -
>
> > > > Mike,
>
> > > > How likely do you think it is that this could be due to a bad PCM?
> > > > Can computer faults be made worse by cool weather?
>
> > > > Thanks
>
> > > I live in the rust belt in Canada.
>
> > > Rusty connections are 'very' temperature dependent and one always finds
> > > out the battery connections need cleaning after the first cold snap,
> > > never before.
>
> > > Have you check the computer's plug for a green pin or green socket? A
> > > green stain means a corroded connection.
>
> > > The oxidized fuse leg is also very common up here. My wife and I were
> > > just comparing notes on that and I think we have had 4 vehicles in the
> > > last 20 years that had that 'no start and no lights' issue including our
> > > Cherokee. On one Volvo 240 is was the fuel pump fuse, the others were
> > > low power ones like for the ignition module.
>
> > > Mike- Ocultar texto de la cita -
>
> > > - Mostrar texto de la cita -
>
> > Although I live in Monterrey, Mexico my jeep comes from Pennsylvania
> > so it has seen it's share of snow and rust!
> > I checked the PCM connector this morning and nothing looked green. I
> > still need to re-check the fuses although I did take out and replace
> > every one. I sure hope it isn't the PCM. Thanks
>
> Power to fuel pump? That's just something I thought of. From the manual I
> have, it looks hard to get to. There's a check valve or something, where
> the fuel rail pressure can leak down too. It would at least be interesting
> to put a pressure gauge on the fuel system and see what it does when all
> this is going on. We're looking for something that deteriorates with time.
> Once an AC mechanic told me that O-rings can shrink and leak refrigerant in
> the cold, then be OK at normal temperature. He was pulling my leg, just too
> stupid and lazy to expose the rear AC unit, but it bears some thinking.
>
> Cheers,
>
> Earle- Hide quoted text -
>
> - Show quoted text -
It also crossed my mind that maybe the fuel pump or something else in
the system was loading the electrical system, causing the delay
somehow but I think that would probably blow a fuse first which it has
not done.
> "nrs" <neale...@yahoo.com> wrote in message
>
> news:1191283935.387886.127120@19g2000hsx.googlegro ups.com...
>
>
>
> > On 1 oct, 12:22, Mike Romain <roma...@sympatico.ca> wrote:
> > > nrs wrote:
> > > > On Oct 1, 10:03 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >> nrs wrote:
> > > >>> On Sep 27, 11:02 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >>>> nrs wrote:
> > > >>>>> My '95 2.5 AX5 YJ has a strange problem, usually in the morning
> when
> > > >>>>> it is cool. When the key is turned to run, the check engine light
> > > >>>>> does not turn on right away. There is a delay of a few seconds
> and
> > > >>>>> then the relays in the power distribution box under the hood start
> to
> > > >>>>> click rapidly. Once this happens, the fuel pump runs for a short
> > > >>>>> while and the jeep can be started. It seems like the computer is
> not
> > > >>>>> aware right away that the ignition has been turned to run. If I
> > > >>>>> immediately turn the key to run again (after first returning it to
> > > >>>>> lock) the check engine and fuel pump turn on normally. After
> letting
> > > >>>>> the jeep sit turned off for about 5-10 minutes, the problem will
> > > >>>>> return. Later in the day when it is hot, this almost never happens
> but
> > > >>>>> it does once in a long while, usually after sitting turned off for
> at
> > > >>>>> least a few hours. What could be causing this? What could cause
> it to
> > > >>>>> work fine on the second try?
> > > >>>>> Thanks
> > > >>>> One more thought for you.
> > > >>>> There is a recall on your emergency brake lever and the ground for
> the
> > > >>>> fuel pump bolts onto the frame of this lever on your 95 YJ. There
> have
> > > >>>> been posted 'fuel pump' and 'ECM' 'failures' right after this job
> is
> > > >>>> done if the wire doesn't get hooked back up. Maybe your ground
> there is
> > > >>>> bad?
> > > >>>> Mike
> > > >>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > >>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> > > >>>> Canadian Off Road Trips Photos: Non members can still view!
> > > >>>> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> > > >>>> (More Off Road album links at bottom of the view page)- Hide quoted
> text -
> > > >>>> - Show quoted text -
> > > >>> The FSM says that not all '95 YJs have this ground wire. Mine
> doesn't
> > > >>> seem to have it (but it still worked fine for a long time before
> this
> > > >>> problem started).
> > > >> One more idea for you I just remembered.
>
> > > >> I have had a bad fuse connection cause a 'no red dash light means no
> > > >> start' issue on several vehicles over the years. It was corrosion on
> > > >> the fuse's legs and their socket causing it.
>
> > > >> Mike- Hide quoted text -
>
> > > >> - Show quoted text -
>
> > > > Mike,
>
> > > > How likely do you think it is that this could be due to a bad PCM?
> > > > Can computer faults be made worse by cool weather?
>
> > > > Thanks
>
> > > I live in the rust belt in Canada.
>
> > > Rusty connections are 'very' temperature dependent and one always finds
> > > out the battery connections need cleaning after the first cold snap,
> > > never before.
>
> > > Have you check the computer's plug for a green pin or green socket? A
> > > green stain means a corroded connection.
>
> > > The oxidized fuse leg is also very common up here. My wife and I were
> > > just comparing notes on that and I think we have had 4 vehicles in the
> > > last 20 years that had that 'no start and no lights' issue including our
> > > Cherokee. On one Volvo 240 is was the fuel pump fuse, the others were
> > > low power ones like for the ignition module.
>
> > > Mike- Ocultar texto de la cita -
>
> > > - Mostrar texto de la cita -
>
> > Although I live in Monterrey, Mexico my jeep comes from Pennsylvania
> > so it has seen it's share of snow and rust!
> > I checked the PCM connector this morning and nothing looked green. I
> > still need to re-check the fuses although I did take out and replace
> > every one. I sure hope it isn't the PCM. Thanks
>
> Power to fuel pump? That's just something I thought of. From the manual I
> have, it looks hard to get to. There's a check valve or something, where
> the fuel rail pressure can leak down too. It would at least be interesting
> to put a pressure gauge on the fuel system and see what it does when all
> this is going on. We're looking for something that deteriorates with time.
> Once an AC mechanic told me that O-rings can shrink and leak refrigerant in
> the cold, then be OK at normal temperature. He was pulling my leg, just too
> stupid and lazy to expose the rear AC unit, but it bears some thinking.
>
> Cheers,
>
> Earle- Hide quoted text -
>
> - Show quoted text -
It also crossed my mind that maybe the fuel pump or something else in
the system was loading the electrical system, causing the delay
somehow but I think that would probably blow a fuse first which it has
not done.
Guest
Posts: n/a
Re: Delayed start problem
On Oct 1, 10:17 pm, "Earle Horton" <el_anglo_burg...@usa.com> wrote:
> "nrs" <neale...@yahoo.com> wrote in message
>
> news:1191283935.387886.127120@19g2000hsx.googlegro ups.com...
>
>
>
> > On 1 oct, 12:22, Mike Romain <roma...@sympatico.ca> wrote:
> > > nrs wrote:
> > > > On Oct 1, 10:03 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >> nrs wrote:
> > > >>> On Sep 27, 11:02 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >>>> nrs wrote:
> > > >>>>> My '95 2.5 AX5 YJ has a strange problem, usually in the morning
> when
> > > >>>>> it is cool. When the key is turned to run, the check engine light
> > > >>>>> does not turn on right away. There is a delay of a few seconds
> and
> > > >>>>> then the relays in the power distribution box under the hood start
> to
> > > >>>>> click rapidly. Once this happens, the fuel pump runs for a short
> > > >>>>> while and the jeep can be started. It seems like the computer is
> not
> > > >>>>> aware right away that the ignition has been turned to run. If I
> > > >>>>> immediately turn the key to run again (after first returning it to
> > > >>>>> lock) the check engine and fuel pump turn on normally. After
> letting
> > > >>>>> the jeep sit turned off for about 5-10 minutes, the problem will
> > > >>>>> return. Later in the day when it is hot, this almost never happens
> but
> > > >>>>> it does once in a long while, usually after sitting turned off for
> at
> > > >>>>> least a few hours. What could be causing this? What could cause
> it to
> > > >>>>> work fine on the second try?
> > > >>>>> Thanks
> > > >>>> One more thought for you.
> > > >>>> There is a recall on your emergency brake lever and the ground for
> the
> > > >>>> fuel pump bolts onto the frame of this lever on your 95 YJ. There
> have
> > > >>>> been posted 'fuel pump' and 'ECM' 'failures' right after this job
> is
> > > >>>> done if the wire doesn't get hooked back up. Maybe your ground
> there is
> > > >>>> bad?
> > > >>>> Mike
> > > >>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > >>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> > > >>>> Canadian Off Road Trips Photos: Non members can still view!
> > > >>>> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> > > >>>> (More Off Road album links at bottom of the view page)- Hide quoted
> text -
> > > >>>> - Show quoted text -
> > > >>> The FSM says that not all '95 YJs have this ground wire. Mine
> doesn't
> > > >>> seem to have it (but it still worked fine for a long time before
> this
> > > >>> problem started).
> > > >> One more idea for you I just remembered.
>
> > > >> I have had a bad fuse connection cause a 'no red dash light means no
> > > >> start' issue on several vehicles over the years. It was corrosion on
> > > >> the fuse's legs and their socket causing it.
>
> > > >> Mike- Hide quoted text -
>
> > > >> - Show quoted text -
>
> > > > Mike,
>
> > > > How likely do you think it is that this could be due to a bad PCM?
> > > > Can computer faults be made worse by cool weather?
>
> > > > Thanks
>
> > > I live in the rust belt in Canada.
>
> > > Rusty connections are 'very' temperature dependent and one always finds
> > > out the battery connections need cleaning after the first cold snap,
> > > never before.
>
> > > Have you check the computer's plug for a green pin or green socket? A
> > > green stain means a corroded connection.
>
> > > The oxidized fuse leg is also very common up here. My wife and I were
> > > just comparing notes on that and I think we have had 4 vehicles in the
> > > last 20 years that had that 'no start and no lights' issue including our
> > > Cherokee. On one Volvo 240 is was the fuel pump fuse, the others were
> > > low power ones like for the ignition module.
>
> > > Mike- Ocultar texto de la cita -
>
> > > - Mostrar texto de la cita -
>
> > Although I live in Monterrey, Mexico my jeep comes from Pennsylvania
> > so it has seen it's share of snow and rust!
> > I checked the PCM connector this morning and nothing looked green. I
> > still need to re-check the fuses although I did take out and replace
> > every one. I sure hope it isn't the PCM. Thanks
>
> Power to fuel pump? That's just something I thought of. From the manual I
> have, it looks hard to get to. There's a check valve or something, where
> the fuel rail pressure can leak down too. It would at least be interesting
> to put a pressure gauge on the fuel system and see what it does when all
> this is going on. We're looking for something that deteriorates with time.
> Once an AC mechanic told me that O-rings can shrink and leak refrigerant in
> the cold, then be OK at normal temperature. He was pulling my leg, just too
> stupid and lazy to expose the rear AC unit, but it bears some thinking.
>
> Cheers,
>
> Earle- Hide quoted text -
>
> - Show quoted text -
It also crossed my mind that maybe the fuel pump or something else in
the system was loading the electrical system, causing the delay
somehow but I think that would probably blow a fuse first which it has
not done.
> "nrs" <neale...@yahoo.com> wrote in message
>
> news:1191283935.387886.127120@19g2000hsx.googlegro ups.com...
>
>
>
> > On 1 oct, 12:22, Mike Romain <roma...@sympatico.ca> wrote:
> > > nrs wrote:
> > > > On Oct 1, 10:03 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >> nrs wrote:
> > > >>> On Sep 27, 11:02 am, Mike Romain <roma...@sympatico.ca> wrote:
> > > >>>> nrs wrote:
> > > >>>>> My '95 2.5 AX5 YJ has a strange problem, usually in the morning
> when
> > > >>>>> it is cool. When the key is turned to run, the check engine light
> > > >>>>> does not turn on right away. There is a delay of a few seconds
> and
> > > >>>>> then the relays in the power distribution box under the hood start
> to
> > > >>>>> click rapidly. Once this happens, the fuel pump runs for a short
> > > >>>>> while and the jeep can be started. It seems like the computer is
> not
> > > >>>>> aware right away that the ignition has been turned to run. If I
> > > >>>>> immediately turn the key to run again (after first returning it to
> > > >>>>> lock) the check engine and fuel pump turn on normally. After
> letting
> > > >>>>> the jeep sit turned off for about 5-10 minutes, the problem will
> > > >>>>> return. Later in the day when it is hot, this almost never happens
> but
> > > >>>>> it does once in a long while, usually after sitting turned off for
> at
> > > >>>>> least a few hours. What could be causing this? What could cause
> it to
> > > >>>>> work fine on the second try?
> > > >>>>> Thanks
> > > >>>> One more thought for you.
> > > >>>> There is a recall on your emergency brake lever and the ground for
> the
> > > >>>> fuel pump bolts onto the frame of this lever on your 95 YJ. There
> have
> > > >>>> been posted 'fuel pump' and 'ECM' 'failures' right after this job
> is
> > > >>>> done if the wire doesn't get hooked back up. Maybe your ground
> there is
> > > >>>> bad?
> > > >>>> Mike
> > > >>>> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > >>>> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> > > >>>> Canadian Off Road Trips Photos: Non members can still view!
> > > >>>> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> > > >>>> (More Off Road album links at bottom of the view page)- Hide quoted
> text -
> > > >>>> - Show quoted text -
> > > >>> The FSM says that not all '95 YJs have this ground wire. Mine
> doesn't
> > > >>> seem to have it (but it still worked fine for a long time before
> this
> > > >>> problem started).
> > > >> One more idea for you I just remembered.
>
> > > >> I have had a bad fuse connection cause a 'no red dash light means no
> > > >> start' issue on several vehicles over the years. It was corrosion on
> > > >> the fuse's legs and their socket causing it.
>
> > > >> Mike- Hide quoted text -
>
> > > >> - Show quoted text -
>
> > > > Mike,
>
> > > > How likely do you think it is that this could be due to a bad PCM?
> > > > Can computer faults be made worse by cool weather?
>
> > > > Thanks
>
> > > I live in the rust belt in Canada.
>
> > > Rusty connections are 'very' temperature dependent and one always finds
> > > out the battery connections need cleaning after the first cold snap,
> > > never before.
>
> > > Have you check the computer's plug for a green pin or green socket? A
> > > green stain means a corroded connection.
>
> > > The oxidized fuse leg is also very common up here. My wife and I were
> > > just comparing notes on that and I think we have had 4 vehicles in the
> > > last 20 years that had that 'no start and no lights' issue including our
> > > Cherokee. On one Volvo 240 is was the fuel pump fuse, the others were
> > > low power ones like for the ignition module.
>
> > > Mike- Ocultar texto de la cita -
>
> > > - Mostrar texto de la cita -
>
> > Although I live in Monterrey, Mexico my jeep comes from Pennsylvania
> > so it has seen it's share of snow and rust!
> > I checked the PCM connector this morning and nothing looked green. I
> > still need to re-check the fuses although I did take out and replace
> > every one. I sure hope it isn't the PCM. Thanks
>
> Power to fuel pump? That's just something I thought of. From the manual I
> have, it looks hard to get to. There's a check valve or something, where
> the fuel rail pressure can leak down too. It would at least be interesting
> to put a pressure gauge on the fuel system and see what it does when all
> this is going on. We're looking for something that deteriorates with time.
> Once an AC mechanic told me that O-rings can shrink and leak refrigerant in
> the cold, then be OK at normal temperature. He was pulling my leg, just too
> stupid and lazy to expose the rear AC unit, but it bears some thinking.
>
> Cheers,
>
> Earle- Hide quoted text -
>
> - Show quoted text -
It also crossed my mind that maybe the fuel pump or something else in
the system was loading the electrical system, causing the delay
somehow but I think that would probably blow a fuse first which it has
not done.
Guest
Posts: n/a
Re: Delayed start problem
On Sep 26, 10:21 am, nrs <neale...@yahoo.com> wrote:
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
The dealership confirmed it is the PCM. I'll be looking for a cheap
used PCM now. Thanks for all your help.
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
The dealership confirmed it is the PCM. I'll be looking for a cheap
used PCM now. Thanks for all your help.
Guest
Posts: n/a
Re: Delayed start problem
On Sep 26, 10:21 am, nrs <neale...@yahoo.com> wrote:
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
The dealership confirmed it is the PCM. I'll be looking for a cheap
used PCM now. Thanks for all your help.
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
The dealership confirmed it is the PCM. I'll be looking for a cheap
used PCM now. Thanks for all your help.
Guest
Posts: n/a
Re: Delayed start problem
On Sep 26, 10:21 am, nrs <neale...@yahoo.com> wrote:
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
The dealership confirmed it is the PCM. I'll be looking for a cheap
used PCM now. Thanks for all your help.
> My '95 2.5 AX5 YJ has a strange problem, usually in the morning when
> it is cool. When the key is turned to run, the check engine light
> does not turn on right away. There is a delay of a few seconds and
> then the relays in the power distribution box under the hood start to
> click rapidly. Once this happens, the fuel pump runs for a short
> while and the jeep can be started. It seems like the computer is not
> aware right away that the ignition has been turned to run. If I
> immediately turn the key to run again (after first returning it to
> lock) the check engine and fuel pump turn on normally. After letting
> the jeep sit turned off for about 5-10 minutes, the problem will
> return. Later in the day when it is hot, this almost never happens but
> it does once in a long while, usually after sitting turned off for at
> least a few hours. What could be causing this? What could cause it to
> work fine on the second try?
>
> Thanks
The dealership confirmed it is the PCM. I'll be looking for a cheap
used PCM now. Thanks for all your help.