1999 JCS Engine Misfires in Reverse
 

Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
drive.
ECM was replaced, same problem
Any ideas?

Re: 1999 JCS Engine Misfires in Reverse
 

What engine?

I would be looking for a harness that was too close to the exhaust or
was really tight I think. When you put it in reverse, the engine moves
which could cause a harness to hit the exhaust or be pulled on even,
especially if you had a weak engine mount.

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)

PhilsTV wrote:
>
> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
> drive.
> ECM was replaced, same problem
> Any ideas?

Re: 1999 JCS Engine Misfires in Reverse
 

What engine?

I would be looking for a harness that was too close to the exhaust or
was really tight I think. When you put it in reverse, the engine moves
which could cause a harness to hit the exhaust or be pulled on even,
especially if you had a weak engine mount.

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)

PhilsTV wrote:
>
> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
> drive.
> ECM was replaced, same problem
> Any ideas?

Re: 1999 JCS Engine Misfires in Reverse
 

What engine?

I would be looking for a harness that was too close to the exhaust or
was really tight I think. When you put it in reverse, the engine moves
which could cause a harness to hit the exhaust or be pulled on even,
especially if you had a weak engine mount.

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)

PhilsTV wrote:
>
> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
> drive.
> ECM was replaced, same problem
> Any ideas?

Re: 1999 JCS Engine Misfires in Reverse
 

Perhaps a leaking injector? You say it only leaks in reverse?


"PhilsTV" <philstv@yahoo.com> wrote in message
news:03272a38e42d69fec6a4da6e981bea04@localhost.ta lkaboutautos.com...
> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
> drive.
> ECM was replaced, same problem
> Any ideas?
>

Re: 1999 JCS Engine Misfires in Reverse
 

Perhaps a leaking injector? You say it only leaks in reverse?


"PhilsTV" <philstv@yahoo.com> wrote in message
news:03272a38e42d69fec6a4da6e981bea04@localhost.ta lkaboutautos.com...
> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
> drive.
> ECM was replaced, same problem
> Any ideas?
>

Re: 1999 JCS Engine Misfires in Reverse
 

Perhaps a leaking injector? You say it only leaks in reverse?


"PhilsTV" <philstv@yahoo.com> wrote in message
news:03272a38e42d69fec6a4da6e981bea04@localhost.ta lkaboutautos.com...
> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
> drive.
> ECM was replaced, same problem
> Any ideas?
>

Re: 1999 JCS Engine Misfires in Reverse
 

"PhilsTV" <philstv@yahoo.com> wrote in message
news:03272a38e42d69fec6a4da6e981bea04@localhost.ta lkaboutautos.com...
> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
> drive.
> ECM was replaced, same problem
> Any ideas?
>

The injectors have power applied all the time with the key on. The ECM
controls the ground to the injectors. Follow the ground wire from the #1
injector back to the ECM. Wire should be White/ Dk Blue. Look for the wiring
harness being pinched/chafed when vehicle is put into reverse. The ground
wire is most likely being shorted to ground which causes the injector to
stay open.

Re: 1999 JCS Engine Misfires in Reverse
 

"PhilsTV" <philstv@yahoo.com> wrote in message
news:03272a38e42d69fec6a4da6e981bea04@localhost.ta lkaboutautos.com...
> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
> drive.
> ECM was replaced, same problem
> Any ideas?
>

The injectors have power applied all the time with the key on. The ECM
controls the ground to the injectors. Follow the ground wire from the #1
injector back to the ECM. Wire should be White/ Dk Blue. Look for the wiring
harness being pinched/chafed when vehicle is put into reverse. The ground
wire is most likely being shorted to ground which causes the injector to
stay open.

Re: 1999 JCS Engine Misfires in Reverse
 

"PhilsTV" <philstv@yahoo.com> wrote in message
news:03272a38e42d69fec6a4da6e981bea04@localhost.ta lkaboutautos.com...
> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
> drive.
> ECM was replaced, same problem
> Any ideas?
>

The injectors have power applied all the time with the key on. The ECM
controls the ground to the injectors. Follow the ground wire from the #1
injector back to the ECM. Wire should be White/ Dk Blue. Look for the wiring
harness being pinched/chafed when vehicle is put into reverse. The ground
wire is most likely being shorted to ground which causes the injector to
stay open.

Re: 1999 JCS Engine Misfires in Reverse
 

It's a 99 Jeep Cherokee Sport so probably the 4.0

Calr

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4514117D.AF446224@sympatico.ca...
> What engine?
>
> I would be looking for a harness that was too close to the exhaust or
> was really tight I think. When you put it in reverse, the engine moves
> which could cause a harness to hit the exhaust or be pulled on even,
> especially if you had a weak engine mount.
>
> 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)
>
> PhilsTV wrote:
>>
>> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
>> drive.
>> ECM was replaced, same problem
>> Any ideas?

Re: 1999 JCS Engine Misfires in Reverse
 

It's a 99 Jeep Cherokee Sport so probably the 4.0

Calr

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4514117D.AF446224@sympatico.ca...
> What engine?
>
> I would be looking for a harness that was too close to the exhaust or
> was really tight I think. When you put it in reverse, the engine moves
> which could cause a harness to hit the exhaust or be pulled on even,
> especially if you had a weak engine mount.
>
> 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)
>
> PhilsTV wrote:
>>
>> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
>> drive.
>> ECM was replaced, same problem
>> Any ideas?

Re: 1999 JCS Engine Misfires in Reverse
 

It's a 99 Jeep Cherokee Sport so probably the 4.0

Calr

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4514117D.AF446224@sympatico.ca...
> What engine?
>
> I would be looking for a harness that was too close to the exhaust or
> was really tight I think. When you put it in reverse, the engine moves
> which could cause a harness to hit the exhaust or be pulled on even,
> especially if you had a weak engine mount.
>
> 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)
>
> PhilsTV wrote:
>>
>> Cylinder #1 floods when it's put in reverse. Hesitates occasionally in
>> drive.
>> ECM was replaced, same problem
>> Any ideas?

Re: 1999 JCS Engine Misfires in Reverse
 

The engine is a 4.0

Re: 1999 JCS Engine Misfires in Reverse
 

The engine is a 4.0

Re: 1999 JCS Engine Misfires in Reverse
 

The engine is a 4.0

Re: 1999 JCS Engine Misfires in Reverse
 

The mechanic that replaced the ECM, replaced the White/Blue wire from the
socket to the injector back the the socket for the ECM and all is well so
far. It's been two weeks and seems to work great.

Thanks for your help.

Phil

Re: 1999 JCS Engine Misfires in Reverse
 

The mechanic that replaced the ECM, replaced the White/Blue wire from the
socket to the injector back the the socket for the ECM and all is well so
far. It's been two weeks and seems to work great.

Thanks for your help.

Phil

Re: 1999 JCS Engine Misfires in Reverse
 

The mechanic that replaced the ECM, replaced the White/Blue wire from the
socket to the injector back the the socket for the ECM and all is well so
far. It's been two weeks and seems to work great.

Thanks for your help.

Phil