Jeep Cherokee hard starting, part II
03-09-2006, 06:51 PM
#11
Guest
Posts: n/a
Re: Jeep Cherokee hard starting, part II
Then again, could be electrical. Your battery in good shape?
Sounds like the starter is taking all the fire away from the ignition.
Soon as you release the key, it has enough spark to run maybe?
I dunno...
Bud wrote:
....when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! A...
Sounds like the starter is taking all the fire away from the ignition.
Soon as you release the key, it has enough spark to run maybe?
I dunno...
Bud wrote:
....when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! A...
03-09-2006, 06:51 PM
#12
Guest
Posts: n/a
Re: Jeep Cherokee hard starting, part II
Then again, could be electrical. Your battery in good shape?
Sounds like the starter is taking all the fire away from the ignition.
Soon as you release the key, it has enough spark to run maybe?
I dunno...
Bud wrote:
....when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! A...
Sounds like the starter is taking all the fire away from the ignition.
Soon as you release the key, it has enough spark to run maybe?
I dunno...
Bud wrote:
....when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! A...
03-09-2006, 06:51 PM
#13
Guest
Posts: n/a
Re: Jeep Cherokee hard starting, part II
Then again, could be electrical. Your battery in good shape?
Sounds like the starter is taking all the fire away from the ignition.
Soon as you release the key, it has enough spark to run maybe?
I dunno...
Bud wrote:
....when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! A...
Sounds like the starter is taking all the fire away from the ignition.
Soon as you release the key, it has enough spark to run maybe?
I dunno...
Bud wrote:
....when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! A...
03-10-2006, 12:22 AM
#14
Guest
Posts: n/a
Re: Jeep Cherokee hard starting, part II
Clay wrote:
> I can't cay about Jeep fuel injection in particular but generally,
> pressing the gas while cranking is a good way to blow the airbox off.
> What you describe is typical behavior for older fuel injection systems.
> The fuel pressure in the rail is bleeding down when the car sits. The
> first time you crank it, it takes forever to fire because there's no
> pressure in the system.
> If you crank it a couple turns, stop, then crank a couple turns more,
> you'll find it lites without any pressing the gas. The first time it
> spins, it builds pressure, then the next time, it goes.
> You can experiment on how many times it needs to go round before it has
> enough pressure to lite and once you get it figured out it'll be the
> same every time.
> May need to stop and start 3 or 4 times to get it to go... My
> girlfriends 91 Cherokee does anyway. Usually it hits on the third 1½
> seconds of cranking.
> Continuous cranking won't do it though.
I haven't been able to go out every day, and my Jeep will sit for 3
or 4 days. When I go out to start it, I turn the key on, wait 2 seconds,
turn it off, then on, wait two seconds, then off, then go for the start.
This recharges the fuel rail and it starts right up. If I don't, it won't.
This only happens when it sits for a few days.
It does run better with my new fuel pump. The old one crapped on me at 72,000.
> I can't cay about Jeep fuel injection in particular but generally,
> pressing the gas while cranking is a good way to blow the airbox off.
> What you describe is typical behavior for older fuel injection systems.
> The fuel pressure in the rail is bleeding down when the car sits. The
> first time you crank it, it takes forever to fire because there's no
> pressure in the system.
> If you crank it a couple turns, stop, then crank a couple turns more,
> you'll find it lites without any pressing the gas. The first time it
> spins, it builds pressure, then the next time, it goes.
> You can experiment on how many times it needs to go round before it has
> enough pressure to lite and once you get it figured out it'll be the
> same every time.
> May need to stop and start 3 or 4 times to get it to go... My
> girlfriends 91 Cherokee does anyway. Usually it hits on the third 1½
> seconds of cranking.
> Continuous cranking won't do it though.
I haven't been able to go out every day, and my Jeep will sit for 3
or 4 days. When I go out to start it, I turn the key on, wait 2 seconds,
turn it off, then on, wait two seconds, then off, then go for the start.
This recharges the fuel rail and it starts right up. If I don't, it won't.
This only happens when it sits for a few days.
It does run better with my new fuel pump. The old one crapped on me at 72,000.
03-10-2006, 12:22 AM
#15
Guest
Posts: n/a
Re: Jeep Cherokee hard starting, part II
Clay wrote:
> I can't cay about Jeep fuel injection in particular but generally,
> pressing the gas while cranking is a good way to blow the airbox off.
> What you describe is typical behavior for older fuel injection systems.
> The fuel pressure in the rail is bleeding down when the car sits. The
> first time you crank it, it takes forever to fire because there's no
> pressure in the system.
> If you crank it a couple turns, stop, then crank a couple turns more,
> you'll find it lites without any pressing the gas. The first time it
> spins, it builds pressure, then the next time, it goes.
> You can experiment on how many times it needs to go round before it has
> enough pressure to lite and once you get it figured out it'll be the
> same every time.
> May need to stop and start 3 or 4 times to get it to go... My
> girlfriends 91 Cherokee does anyway. Usually it hits on the third 1½
> seconds of cranking.
> Continuous cranking won't do it though.
I haven't been able to go out every day, and my Jeep will sit for 3
or 4 days. When I go out to start it, I turn the key on, wait 2 seconds,
turn it off, then on, wait two seconds, then off, then go for the start.
This recharges the fuel rail and it starts right up. If I don't, it won't.
This only happens when it sits for a few days.
It does run better with my new fuel pump. The old one crapped on me at 72,000.
> I can't cay about Jeep fuel injection in particular but generally,
> pressing the gas while cranking is a good way to blow the airbox off.
> What you describe is typical behavior for older fuel injection systems.
> The fuel pressure in the rail is bleeding down when the car sits. The
> first time you crank it, it takes forever to fire because there's no
> pressure in the system.
> If you crank it a couple turns, stop, then crank a couple turns more,
> you'll find it lites without any pressing the gas. The first time it
> spins, it builds pressure, then the next time, it goes.
> You can experiment on how many times it needs to go round before it has
> enough pressure to lite and once you get it figured out it'll be the
> same every time.
> May need to stop and start 3 or 4 times to get it to go... My
> girlfriends 91 Cherokee does anyway. Usually it hits on the third 1½
> seconds of cranking.
> Continuous cranking won't do it though.
I haven't been able to go out every day, and my Jeep will sit for 3
or 4 days. When I go out to start it, I turn the key on, wait 2 seconds,
turn it off, then on, wait two seconds, then off, then go for the start.
This recharges the fuel rail and it starts right up. If I don't, it won't.
This only happens when it sits for a few days.
It does run better with my new fuel pump. The old one crapped on me at 72,000.
03-10-2006, 12:22 AM
#16
Guest
Posts: n/a
Re: Jeep Cherokee hard starting, part II
Clay wrote:
> I can't cay about Jeep fuel injection in particular but generally,
> pressing the gas while cranking is a good way to blow the airbox off.
> What you describe is typical behavior for older fuel injection systems.
> The fuel pressure in the rail is bleeding down when the car sits. The
> first time you crank it, it takes forever to fire because there's no
> pressure in the system.
> If you crank it a couple turns, stop, then crank a couple turns more,
> you'll find it lites without any pressing the gas. The first time it
> spins, it builds pressure, then the next time, it goes.
> You can experiment on how many times it needs to go round before it has
> enough pressure to lite and once you get it figured out it'll be the
> same every time.
> May need to stop and start 3 or 4 times to get it to go... My
> girlfriends 91 Cherokee does anyway. Usually it hits on the third 1½
> seconds of cranking.
> Continuous cranking won't do it though.
I haven't been able to go out every day, and my Jeep will sit for 3
or 4 days. When I go out to start it, I turn the key on, wait 2 seconds,
turn it off, then on, wait two seconds, then off, then go for the start.
This recharges the fuel rail and it starts right up. If I don't, it won't.
This only happens when it sits for a few days.
It does run better with my new fuel pump. The old one crapped on me at 72,000.
> I can't cay about Jeep fuel injection in particular but generally,
> pressing the gas while cranking is a good way to blow the airbox off.
> What you describe is typical behavior for older fuel injection systems.
> The fuel pressure in the rail is bleeding down when the car sits. The
> first time you crank it, it takes forever to fire because there's no
> pressure in the system.
> If you crank it a couple turns, stop, then crank a couple turns more,
> you'll find it lites without any pressing the gas. The first time it
> spins, it builds pressure, then the next time, it goes.
> You can experiment on how many times it needs to go round before it has
> enough pressure to lite and once you get it figured out it'll be the
> same every time.
> May need to stop and start 3 or 4 times to get it to go... My
> girlfriends 91 Cherokee does anyway. Usually it hits on the third 1½
> seconds of cranking.
> Continuous cranking won't do it though.
I haven't been able to go out every day, and my Jeep will sit for 3
or 4 days. When I go out to start it, I turn the key on, wait 2 seconds,
turn it off, then on, wait two seconds, then off, then go for the start.
This recharges the fuel rail and it starts right up. If I don't, it won't.
This only happens when it sits for a few days.
It does run better with my new fuel pump. The old one crapped on me at 72,000.
03-10-2006, 12:22 AM
#17
Guest
Posts: n/a
Re: Jeep Cherokee hard starting, part II
Clay wrote:
> I can't cay about Jeep fuel injection in particular but generally,
> pressing the gas while cranking is a good way to blow the airbox off.
> What you describe is typical behavior for older fuel injection systems.
> The fuel pressure in the rail is bleeding down when the car sits. The
> first time you crank it, it takes forever to fire because there's no
> pressure in the system.
> If you crank it a couple turns, stop, then crank a couple turns more,
> you'll find it lites without any pressing the gas. The first time it
> spins, it builds pressure, then the next time, it goes.
> You can experiment on how many times it needs to go round before it has
> enough pressure to lite and once you get it figured out it'll be the
> same every time.
> May need to stop and start 3 or 4 times to get it to go... My
> girlfriends 91 Cherokee does anyway. Usually it hits on the third 1½
> seconds of cranking.
> Continuous cranking won't do it though.
I haven't been able to go out every day, and my Jeep will sit for 3
or 4 days. When I go out to start it, I turn the key on, wait 2 seconds,
turn it off, then on, wait two seconds, then off, then go for the start.
This recharges the fuel rail and it starts right up. If I don't, it won't.
This only happens when it sits for a few days.
It does run better with my new fuel pump. The old one crapped on me at 72,000.
> I can't cay about Jeep fuel injection in particular but generally,
> pressing the gas while cranking is a good way to blow the airbox off.
> What you describe is typical behavior for older fuel injection systems.
> The fuel pressure in the rail is bleeding down when the car sits. The
> first time you crank it, it takes forever to fire because there's no
> pressure in the system.
> If you crank it a couple turns, stop, then crank a couple turns more,
> you'll find it lites without any pressing the gas. The first time it
> spins, it builds pressure, then the next time, it goes.
> You can experiment on how many times it needs to go round before it has
> enough pressure to lite and once you get it figured out it'll be the
> same every time.
> May need to stop and start 3 or 4 times to get it to go... My
> girlfriends 91 Cherokee does anyway. Usually it hits on the third 1½
> seconds of cranking.
> Continuous cranking won't do it though.
I haven't been able to go out every day, and my Jeep will sit for 3
or 4 days. When I go out to start it, I turn the key on, wait 2 seconds,
turn it off, then on, wait two seconds, then off, then go for the start.
This recharges the fuel rail and it starts right up. If I don't, it won't.
This only happens when it sits for a few days.
It does run better with my new fuel pump. The old one crapped on me at 72,000.
03-14-2006, 11:17 AM
#18
Guest
Posts: n/a
Re: Jeep Cherokee hard starting, part II
Not enough electricity getting where it is needed.
Surprisingly I will say you should check the body ground strap that runs
from the engine head to the firewall. I suspect it is rotted or the
connections are dirty on it. If it doesn't pass clean electricity, then
the engine control modules don't have enough power when the starter is
cranking.
If that strap is ok, then I would suspect a dirty connection on the
starter solenoid relay. There are a bunch of small wires there that
direct the power when the starter is working.
I would still be cleaning the TPS connection like I mentioned earlier.
It causes one of your symptoms. That connection can be cleaned with
WD40 even...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Bud wrote:
>
> Hi all -
>
> I have a 1991 Jeep Cherokee Laredo with the in-line 6 and
> auto-transmission. I have been fighting a hard start problem, which I
> posted on this forum about a month ago. My suspicions at that point
> were the fuel pump or the crankshaft position sensor. I've noticed
> lately some different behavior, and wanted to see what folks thought of
> these symptoms. Here goes. If I just sit and crank it, it takes
> forever to eventually catch and start. What I've developed is a way to
> almost always get it to start. I floor the gas, start to crank it, but
> after about 3 seconds or so, I stop cranking it by turning the key to
> the ON position from START. While I do this, I keep the gas floored.
> Almost always, when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! At first I thought this was a
> fluke, but the method has been consistent for about the last dozen
> starts or so. I'm at a loss here, can anyone offer anything?
>
> Thanks,
> Bud
Surprisingly I will say you should check the body ground strap that runs
from the engine head to the firewall. I suspect it is rotted or the
connections are dirty on it. If it doesn't pass clean electricity, then
the engine control modules don't have enough power when the starter is
cranking.
If that strap is ok, then I would suspect a dirty connection on the
starter solenoid relay. There are a bunch of small wires there that
direct the power when the starter is working.
I would still be cleaning the TPS connection like I mentioned earlier.
It causes one of your symptoms. That connection can be cleaned with
WD40 even...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Bud wrote:
>
> Hi all -
>
> I have a 1991 Jeep Cherokee Laredo with the in-line 6 and
> auto-transmission. I have been fighting a hard start problem, which I
> posted on this forum about a month ago. My suspicions at that point
> were the fuel pump or the crankshaft position sensor. I've noticed
> lately some different behavior, and wanted to see what folks thought of
> these symptoms. Here goes. If I just sit and crank it, it takes
> forever to eventually catch and start. What I've developed is a way to
> almost always get it to start. I floor the gas, start to crank it, but
> after about 3 seconds or so, I stop cranking it by turning the key to
> the ON position from START. While I do this, I keep the gas floored.
> Almost always, when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! At first I thought this was a
> fluke, but the method has been consistent for about the last dozen
> starts or so. I'm at a loss here, can anyone offer anything?
>
> Thanks,
> Bud
03-14-2006, 11:17 AM
#19
Guest
Posts: n/a
Re: Jeep Cherokee hard starting, part II
Not enough electricity getting where it is needed.
Surprisingly I will say you should check the body ground strap that runs
from the engine head to the firewall. I suspect it is rotted or the
connections are dirty on it. If it doesn't pass clean electricity, then
the engine control modules don't have enough power when the starter is
cranking.
If that strap is ok, then I would suspect a dirty connection on the
starter solenoid relay. There are a bunch of small wires there that
direct the power when the starter is working.
I would still be cleaning the TPS connection like I mentioned earlier.
It causes one of your symptoms. That connection can be cleaned with
WD40 even...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Bud wrote:
>
> Hi all -
>
> I have a 1991 Jeep Cherokee Laredo with the in-line 6 and
> auto-transmission. I have been fighting a hard start problem, which I
> posted on this forum about a month ago. My suspicions at that point
> were the fuel pump or the crankshaft position sensor. I've noticed
> lately some different behavior, and wanted to see what folks thought of
> these symptoms. Here goes. If I just sit and crank it, it takes
> forever to eventually catch and start. What I've developed is a way to
> almost always get it to start. I floor the gas, start to crank it, but
> after about 3 seconds or so, I stop cranking it by turning the key to
> the ON position from START. While I do this, I keep the gas floored.
> Almost always, when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! At first I thought this was a
> fluke, but the method has been consistent for about the last dozen
> starts or so. I'm at a loss here, can anyone offer anything?
>
> Thanks,
> Bud
Surprisingly I will say you should check the body ground strap that runs
from the engine head to the firewall. I suspect it is rotted or the
connections are dirty on it. If it doesn't pass clean electricity, then
the engine control modules don't have enough power when the starter is
cranking.
If that strap is ok, then I would suspect a dirty connection on the
starter solenoid relay. There are a bunch of small wires there that
direct the power when the starter is working.
I would still be cleaning the TPS connection like I mentioned earlier.
It causes one of your symptoms. That connection can be cleaned with
WD40 even...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Bud wrote:
>
> Hi all -
>
> I have a 1991 Jeep Cherokee Laredo with the in-line 6 and
> auto-transmission. I have been fighting a hard start problem, which I
> posted on this forum about a month ago. My suspicions at that point
> were the fuel pump or the crankshaft position sensor. I've noticed
> lately some different behavior, and wanted to see what folks thought of
> these symptoms. Here goes. If I just sit and crank it, it takes
> forever to eventually catch and start. What I've developed is a way to
> almost always get it to start. I floor the gas, start to crank it, but
> after about 3 seconds or so, I stop cranking it by turning the key to
> the ON position from START. While I do this, I keep the gas floored.
> Almost always, when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! At first I thought this was a
> fluke, but the method has been consistent for about the last dozen
> starts or so. I'm at a loss here, can anyone offer anything?
>
> Thanks,
> Bud
03-14-2006, 11:17 AM
#20
Guest
Posts: n/a
Re: Jeep Cherokee hard starting, part II
Not enough electricity getting where it is needed.
Surprisingly I will say you should check the body ground strap that runs
from the engine head to the firewall. I suspect it is rotted or the
connections are dirty on it. If it doesn't pass clean electricity, then
the engine control modules don't have enough power when the starter is
cranking.
If that strap is ok, then I would suspect a dirty connection on the
starter solenoid relay. There are a bunch of small wires there that
direct the power when the starter is working.
I would still be cleaning the TPS connection like I mentioned earlier.
It causes one of your symptoms. That connection can be cleaned with
WD40 even...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Bud wrote:
>
> Hi all -
>
> I have a 1991 Jeep Cherokee Laredo with the in-line 6 and
> auto-transmission. I have been fighting a hard start problem, which I
> posted on this forum about a month ago. My suspicions at that point
> were the fuel pump or the crankshaft position sensor. I've noticed
> lately some different behavior, and wanted to see what folks thought of
> these symptoms. Here goes. If I just sit and crank it, it takes
> forever to eventually catch and start. What I've developed is a way to
> almost always get it to start. I floor the gas, start to crank it, but
> after about 3 seconds or so, I stop cranking it by turning the key to
> the ON position from START. While I do this, I keep the gas floored.
> Almost always, when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! At first I thought this was a
> fluke, but the method has been consistent for about the last dozen
> starts or so. I'm at a loss here, can anyone offer anything?
>
> Thanks,
> Bud
Surprisingly I will say you should check the body ground strap that runs
from the engine head to the firewall. I suspect it is rotted or the
connections are dirty on it. If it doesn't pass clean electricity, then
the engine control modules don't have enough power when the starter is
cranking.
If that strap is ok, then I would suspect a dirty connection on the
starter solenoid relay. There are a bunch of small wires there that
direct the power when the starter is working.
I would still be cleaning the TPS connection like I mentioned earlier.
It causes one of your symptoms. That connection can be cleaned with
WD40 even...
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)
Bud wrote:
>
> Hi all -
>
> I have a 1991 Jeep Cherokee Laredo with the in-line 6 and
> auto-transmission. I have been fighting a hard start problem, which I
> posted on this forum about a month ago. My suspicions at that point
> were the fuel pump or the crankshaft position sensor. I've noticed
> lately some different behavior, and wanted to see what folks thought of
> these symptoms. Here goes. If I just sit and crank it, it takes
> forever to eventually catch and start. What I've developed is a way to
> almost always get it to start. I floor the gas, start to crank it, but
> after about 3 seconds or so, I stop cranking it by turning the key to
> the ON position from START. While I do this, I keep the gas floored.
> Almost always, when I stop cranking and turn the key from START to ON,
> *then* it catches and starts running!! At first I thought this was a
> fluke, but the method has been consistent for about the last dozen
> starts or so. I'm at a loss here, can anyone offer anything?
>
> Thanks,
> Bud
