That crap in the fuel rail had to come from somewhere so until you
find the source anything else is wasted effort. If the rail was full
of crud, think what the fuel filter must look like. And anything that
extreme would likely even plug the sock filter on the pump intake
*inside the fuel tank) and/or the pump itself. Closest I can come to
what you describe was a diesel tank that grew a fungus of some sort
but I've never seen that with gasoline.

Sure you don't have some neighbohood teens with too much time on their
hands?

On Sat, 25 Mar 2006 01:00:57 UTC "jeepr" <YJJPS@nospam@yahoo.ca>
wrote:

> Just reg gas from Canadian Tire no ethenol., but they have been flushed
> twice,
> what is a noid light and what is the test procedure
> Thanks for the reply JD.
>
>
> Matt
> 0|||||||0
> Tact is the ability to describe others as they see themselves
> "JD Adams" <JDAdams@Softcom.Net> wrote in message
> news:1143245234.995431.15120@i40g2000cwc.googlegro ups.com...
> > 1a. Took off fuel rail; full of crap, install fuel rail and do
> > injection
> > flush.
> > Worked great for about 3 weeks symptoms reappear.
> >
> > Sounds like you still have an injector problem. Try hooking up a noid
> > light to each one while the engine is cold. If that passes muster,
> > they may all have to be pulled for further testing and cleaning.
> >
> > What sort of 'crap' are we talking about here? Corrosion maybe? What
> > type/brand of fuel were you running? Ethanol content?
> >
>
>


--
Will Honea

 

That crap in the fuel rail had to come from somewhere so until you
find the source anything else is wasted effort. If the rail was full
of crud, think what the fuel filter must look like. And anything that
extreme would likely even plug the sock filter on the pump intake
*inside the fuel tank) and/or the pump itself. Closest I can come to
what you describe was a diesel tank that grew a fungus of some sort
but I've never seen that with gasoline.

Sure you don't have some neighbohood teens with too much time on their
hands?

On Sat, 25 Mar 2006 01:00:57 UTC "jeepr" <YJJPS@nospam@yahoo.ca>
wrote:

> Just reg gas from Canadian Tire no ethenol., but they have been flushed
> twice,
> what is a noid light and what is the test procedure
> Thanks for the reply JD.
>
>
> Matt
> 0|||||||0
> Tact is the ability to describe others as they see themselves
> "JD Adams" <JDAdams@Softcom.Net> wrote in message
> news:1143245234.995431.15120@i40g2000cwc.googlegro ups.com...
> > 1a. Took off fuel rail; full of crap, install fuel rail and do
> > injection
> > flush.
> > Worked great for about 3 weeks symptoms reappear.
> >
> > Sounds like you still have an injector problem. Try hooking up a noid
> > light to each one while the engine is cold. If that passes muster,
> > they may all have to be pulled for further testing and cleaning.
> >
> > What sort of 'crap' are we talking about here? Corrosion maybe? What
> > type/brand of fuel were you running? Ethanol content?
> >
>
>


--
Will Honea

 

That crap in the fuel rail had to come from somewhere so until you
find the source anything else is wasted effort. If the rail was full
of crud, think what the fuel filter must look like. And anything that
extreme would likely even plug the sock filter on the pump intake
*inside the fuel tank) and/or the pump itself. Closest I can come to
what you describe was a diesel tank that grew a fungus of some sort
but I've never seen that with gasoline.

Sure you don't have some neighbohood teens with too much time on their
hands?

On Sat, 25 Mar 2006 01:00:57 UTC "jeepr" <YJJPS@nospam@yahoo.ca>
wrote:

> Just reg gas from Canadian Tire no ethenol., but they have been flushed
> twice,
> what is a noid light and what is the test procedure
> Thanks for the reply JD.
>
>
> Matt
> 0|||||||0
> Tact is the ability to describe others as they see themselves
> "JD Adams" <JDAdams@Softcom.Net> wrote in message
> news:1143245234.995431.15120@i40g2000cwc.googlegro ups.com...
> > 1a. Took off fuel rail; full of crap, install fuel rail and do
> > injection
> > flush.
> > Worked great for about 3 weeks symptoms reappear.
> >
> > Sounds like you still have an injector problem. Try hooking up a noid
> > light to each one while the engine is cold. If that passes muster,
> > they may all have to be pulled for further testing and cleaning.
> >
> > What sort of 'crap' are we talking about here? Corrosion maybe? What
> > type/brand of fuel were you running? Ethanol content?
> >
>
>


--
Will Honea

 

Hi Will,
On my thunderbird, I neglected to change my gas filter until after
it had burnt out the fuel pump at a hundred and fifty thousand miles.
The filter had this hairy something that grew six inches up the line
towards the engine. Fortunately the '98 Grand Cherokee is made to be
replace: http://www.----------.com/WJfuelpresure.pdf Probably every
thirty thousand miles if it's like a Ford or GM.
God Bless America, Bill O|||||||O
mailto:--------------------

Will Honea wrote:
>
> That crap in the fuel rail had to come from somewhere so until you
> find the source anything else is wasted effort. If the rail was full
> of crud, think what the fuel filter must look like. And anything that
> extreme would likely even plug the sock filter on the pump intake
> *inside the fuel tank) and/or the pump itself. Closest I can come to
> what you describe was a diesel tank that grew a fungus of some sort
> but I've never seen that with gasoline.
>
> Sure you don't have some neighbohood teens with too much time on their
> hands?

 

Hi Will,
On my thunderbird, I neglected to change my gas filter until after
it had burnt out the fuel pump at a hundred and fifty thousand miles.
The filter had this hairy something that grew six inches up the line
towards the engine. Fortunately the '98 Grand Cherokee is made to be
replace: http://www.----------.com/WJfuelpresure.pdf Probably every
thirty thousand miles if it's like a Ford or GM.
God Bless America, Bill O|||||||O
mailto:--------------------

Will Honea wrote:
>
> That crap in the fuel rail had to come from somewhere so until you
> find the source anything else is wasted effort. If the rail was full
> of crud, think what the fuel filter must look like. And anything that
> extreme would likely even plug the sock filter on the pump intake
> *inside the fuel tank) and/or the pump itself. Closest I can come to
> what you describe was a diesel tank that grew a fungus of some sort
> but I've never seen that with gasoline.
>
> Sure you don't have some neighbohood teens with too much time on their
> hands?

 

Hi Will,
On my thunderbird, I neglected to change my gas filter until after
it had burnt out the fuel pump at a hundred and fifty thousand miles.
The filter had this hairy something that grew six inches up the line
towards the engine. Fortunately the '98 Grand Cherokee is made to be
replace: http://www.----------.com/WJfuelpresure.pdf Probably every
thirty thousand miles if it's like a Ford or GM.
God Bless America, Bill O|||||||O
mailto:--------------------

Will Honea wrote:
>
> That crap in the fuel rail had to come from somewhere so until you
> find the source anything else is wasted effort. If the rail was full
> of crud, think what the fuel filter must look like. And anything that
> extreme would likely even plug the sock filter on the pump intake
> *inside the fuel tank) and/or the pump itself. Closest I can come to
> what you describe was a diesel tank that grew a fungus of some sort
> but I've never seen that with gasoline.
>
> Sure you don't have some neighbohood teens with too much time on their
> hands?

 

Mike
it has all been done since the problem occurred.
Like I said the fuel tank has been cleaned. the fuel pump and filter
replaced, injector flush, decarb the valves and all those components
replaced and nothing has fixed the problem, nothing showing on the read outs
from all test boxes, and it only when cold' so can't be hoodlum's

--

Matt
0|||||||0
Tact is the ability to describe others as they see themselves
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:44249A4A.DA8617F8@sympatico.ca...
> Was the maintenance done because of the miss? If not how much was
> before and after?
>
> 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)
>
> jeepr wrote:
> >
> > 98 zj, 6 cyl. Runs rough after starting, when engine warm runs smooth.
> > No check engine light. Have done maintenance in following order
> > 1. New plugs, new wires,new rotor,new cap
> > 1a. Took off fuel rail; full of crap, install fuel rail and do injection
> > flush.
> > Worked great for about 3 weeks symptoms reappear.
> > 2. Drop fuel tank have steam cleaned, replace intank fuel pump, do a
> > injection flush from fuel tank forward.
> > Now have about $1200 invested in repairs and symptoms are still there.
> >
> > Have hooked up the dealer pilot computer to record conditions when
symptoms
> > occur with nil negative pick ups
> > Dealer has done there chemical carbon cleaning of intake valves, twice
> > dealer baroscopic the valves and there is no carbon on valves
> >
> > Have replaced the following with no positive results;
> > Crankshaft Position sensor
> > O2 sensors
> > Engine Coolant Sensor
> > The Main Computer
> >
> > No check engine light and runs rough when cold when first accelerating
as
> > the accelerator is push vehicle will smooth out and
> > accelerate, like its missing on some cylinders.
> > Does not latch any code.
> >
> > Matt
> > 0|||||||0
> > Tact is the ability to describe others as they see themselves

 

Mike
it has all been done since the problem occurred.
Like I said the fuel tank has been cleaned. the fuel pump and filter
replaced, injector flush, decarb the valves and all those components
replaced and nothing has fixed the problem, nothing showing on the read outs
from all test boxes, and it only when cold' so can't be hoodlum's

--

Matt
0|||||||0
Tact is the ability to describe others as they see themselves
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:44249A4A.DA8617F8@sympatico.ca...
> Was the maintenance done because of the miss? If not how much was
> before and after?
>
> 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)
>
> jeepr wrote:
> >
> > 98 zj, 6 cyl. Runs rough after starting, when engine warm runs smooth.
> > No check engine light. Have done maintenance in following order
> > 1. New plugs, new wires,new rotor,new cap
> > 1a. Took off fuel rail; full of crap, install fuel rail and do injection
> > flush.
> > Worked great for about 3 weeks symptoms reappear.
> > 2. Drop fuel tank have steam cleaned, replace intank fuel pump, do a
> > injection flush from fuel tank forward.
> > Now have about $1200 invested in repairs and symptoms are still there.
> >
> > Have hooked up the dealer pilot computer to record conditions when
symptoms
> > occur with nil negative pick ups
> > Dealer has done there chemical carbon cleaning of intake valves, twice
> > dealer baroscopic the valves and there is no carbon on valves
> >
> > Have replaced the following with no positive results;
> > Crankshaft Position sensor
> > O2 sensors
> > Engine Coolant Sensor
> > The Main Computer
> >
> > No check engine light and runs rough when cold when first accelerating
as
> > the accelerator is push vehicle will smooth out and
> > accelerate, like its missing on some cylinders.
> > Does not latch any code.
> >
> > Matt
> > 0|||||||0
> > Tact is the ability to describe others as they see themselves

 

Mike
it has all been done since the problem occurred.
Like I said the fuel tank has been cleaned. the fuel pump and filter
replaced, injector flush, decarb the valves and all those components
replaced and nothing has fixed the problem, nothing showing on the read outs
from all test boxes, and it only when cold' so can't be hoodlum's

--

Matt
0|||||||0
Tact is the ability to describe others as they see themselves
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:44249A4A.DA8617F8@sympatico.ca...
> Was the maintenance done because of the miss? If not how much was
> before and after?
>
> 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)
>
> jeepr wrote:
> >
> > 98 zj, 6 cyl. Runs rough after starting, when engine warm runs smooth.
> > No check engine light. Have done maintenance in following order
> > 1. New plugs, new wires,new rotor,new cap
> > 1a. Took off fuel rail; full of crap, install fuel rail and do injection
> > flush.
> > Worked great for about 3 weeks symptoms reappear.
> > 2. Drop fuel tank have steam cleaned, replace intank fuel pump, do a
> > injection flush from fuel tank forward.
> > Now have about $1200 invested in repairs and symptoms are still there.
> >
> > Have hooked up the dealer pilot computer to record conditions when
symptoms
> > occur with nil negative pick ups
> > Dealer has done there chemical carbon cleaning of intake valves, twice
> > dealer baroscopic the valves and there is no carbon on valves
> >
> > Have replaced the following with no positive results;
> > Crankshaft Position sensor
> > O2 sensors
> > Engine Coolant Sensor
> > The Main Computer
> >
> > No check engine light and runs rough when cold when first accelerating
as
> > the accelerator is push vehicle will smooth out and
> > accelerate, like its missing on some cylinders.
> > Does not latch any code.
> >
> > Matt
> > 0|||||||0
> > Tact is the ability to describe others as they see themselves

 

So something is up with the cold start circuit. Hmm....

Ok, maybe two problems? Your first issue was with crap in the gas.
Maybe you caused the second issue? Just a wild assed guess, but there
are a bad run of distributor caps and rotors out on the market for the
4.0 engine. The rotors are too short which causes arcing and a cold
engine miss for a while, then a miss all the time.

Someone voiced the opinion the parts were made in two different
factories or countries and they don't mate up together properly.

Cold start misses can also be a bad or leaky plug wire. Even one just
not pushed on tight. New ones can be bad too. I check them by spray
misting them with water when it's dark out.

Mike

jeepr wrote:
>
> Mike
> it has all been done since the problem occurred.
> Like I said the fuel tank has been cleaned. the fuel pump and filter
> replaced, injector flush, decarb the valves and all those components
> replaced and nothing has fixed the problem, nothing showing on the read outs
> from all test boxes, and it only when cold' so can't be hoodlum's
>
> --
>
> Matt
> 0|||||||0
> Tact is the ability to describe others as they see themselves
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:44249A4A.DA8617F8@sympatico.ca...
> > Was the maintenance done because of the miss? If not how much was
> > before and after?
> >
> > 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)
> >
> > jeepr wrote:
> > >
> > > 98 zj, 6 cyl. Runs rough after starting, when engine warm runs smooth.
> > > No check engine light. Have done maintenance in following order
> > > 1. New plugs, new wires,new rotor,new cap
> > > 1a. Took off fuel rail; full of crap, install fuel rail and do injection
> > > flush.
> > > Worked great for about 3 weeks symptoms reappear.
> > > 2. Drop fuel tank have steam cleaned, replace intank fuel pump, do a
> > > injection flush from fuel tank forward.
> > > Now have about $1200 invested in repairs and symptoms are still there.
> > >
> > > Have hooked up the dealer pilot computer to record conditions when
> symptoms
> > > occur with nil negative pick ups
> > > Dealer has done there chemical carbon cleaning of intake valves, twice
> > > dealer baroscopic the valves and there is no carbon on valves
> > >
> > > Have replaced the following with no positive results;
> > > Crankshaft Position sensor
> > > O2 sensors
> > > Engine Coolant Sensor
> > > The Main Computer
> > >
> > > No check engine light and runs rough when cold when first accelerating
> as
> > > the accelerator is push vehicle will smooth out and
> > > accelerate, like its missing on some cylinders.
> > > Does not latch any code.
> > >
> > > Matt
> > > 0|||||||0
> > > Tact is the ability to describe others as they see themselves