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XJ Ask the Question Thread
Newbie
Join Date: Jan 2013
Location: Illinois
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Year: 1997
Model: Cherokee
Engine: 4.0L I6
No power at coil
Hey guys spent the past 4 days trying to troubleshoot this problem with no success. Jeep started in morning then turned it off to work on new stereo I'm putting in. In the process of re-wiring the new stereo I shorted out the Pink and Red/White wires which proceeded to kill my dome lights, cigarette lighter etc. Replaced that fuse, lights come on all seems fine go to start the car and now have no spark. I have traced the problem back to no power coming into the coil. Replaced CPS, checked grounds, checked throttle position sensor, checked power at computer plugs, everything seems inline except no power to coil. So wondering if anyone has some ideas of items to check?
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Join Date: Jul 2009
Location: New Jersey
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Year: 2000
Model: Cherokee
Engine: l6 HO
Hey guys spent the past 4 days trying to troubleshoot this problem with no success. Jeep started in morning then turned it off to work on new stereo I'm putting in. In the process of re-wiring the new stereo I shorted out the Pink and Red/White wires which proceeded to kill my dome lights, cigarette lighter etc. Replaced that fuse, lights come on all seems fine go to start the car and now have no spark. I have traced the problem back to no power coming into the coil. Replaced CPS, checked grounds, checked throttle position sensor, checked power at computer plugs, everything seems inline except no power to coil. So wondering if anyone has some ideas of items to check?
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Location: Illinois
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Year: 1997
Model: Cherokee
Engine: 4.0L I6
'97 and yeah i have checked every single fuse under the hood and by the passengers feet, also have swapped all relays so i know all relays are good.
CF Veteran
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Year: 2000
Model: Cherokee
Engine: l6 HO
I used to have a diagram with location of all the fusible links but I can't find it at the moment on my phone. Maybe someone can chime in with it before I find it.
CF Veteran
Join Date: Mar 2012
Location: Quebec
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Year: 1996
Model: Cherokee
Engine: 4.0L
I made a thread a while ago, but instead of bumping, I'll ask my question here.
My 96 cherokee has some trouble. when im driving, sometimes (it happens mostly when it's very cold outside) the cherokee will have trouble giving proper gas. even if I put the pedal to the floor, you can see the rpm go up and down, like if it was stopping giving it gas, and then giving some again. if I put it in 2nd or 3rd gear and make it rev alot, at one point the issue will stop but will start again 10 minutes later or when I restart the car.
no check engine light, no error codes. so I bring it to the garage and the guy told me he found out I needed a new o2 sensor.
so I was wondering, could this problem be caused by a faulty/old o2 sensor or is there something else? (we thought maybe a clogged cat or something like that, but I don't know if the guy checked that)
thanks!
My 96 cherokee has some trouble. when im driving, sometimes (it happens mostly when it's very cold outside) the cherokee will have trouble giving proper gas. even if I put the pedal to the floor, you can see the rpm go up and down, like if it was stopping giving it gas, and then giving some again. if I put it in 2nd or 3rd gear and make it rev alot, at one point the issue will stop but will start again 10 minutes later or when I restart the car.
no check engine light, no error codes. so I bring it to the garage and the guy told me he found out I needed a new o2 sensor.
so I was wondering, could this problem be caused by a faulty/old o2 sensor or is there something else? (we thought maybe a clogged cat or something like that, but I don't know if the guy checked that)
thanks!
Moderator of Jeeps
Join Date: Jul 2011
Location: Frederick, MD from Cleveland, OH
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Year: 1993 YJ Wrangler
Engine: 4.0 I6
I made a thread a while ago, but instead of bumping, I'll ask my question here.
My 96 cherokee has some trouble. when im driving, sometimes (it happens mostly when it's very cold outside) the cherokee will have trouble giving proper gas. even if I put the pedal to the floor, you can see the rpm go up and down, like if it was stopping giving it gas, and then giving some again. if I put it in 2nd or 3rd gear and make it rev alot, at one point the issue will stop but will start again 10 minutes later or when I restart the car.
no check engine light, no error codes. so I bring it to the garage and the guy told me he found out I needed a new o2 sensor.
so I was wondering, could this problem be caused by a faulty/old o2 sensor or is there something else? (we thought maybe a clogged cat or something like that, but I don't know if the guy checked that)
thanks!
My 96 cherokee has some trouble. when im driving, sometimes (it happens mostly when it's very cold outside) the cherokee will have trouble giving proper gas. even if I put the pedal to the floor, you can see the rpm go up and down, like if it was stopping giving it gas, and then giving some again. if I put it in 2nd or 3rd gear and make it rev alot, at one point the issue will stop but will start again 10 minutes later or when I restart the car.
no check engine light, no error codes. so I bring it to the garage and the guy told me he found out I needed a new o2 sensor.
so I was wondering, could this problem be caused by a faulty/old o2 sensor or is there something else? (we thought maybe a clogged cat or something like that, but I don't know if the guy checked that)
thanks!
CF Veteran
Join Date: Mar 2012
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Year: 1996
Model: Cherokee
Engine: 4.0L
But the car is already in the garage and the guy is awaiting my word if I get the sensor changed or not. I guess I should still do that?
Senior Member
Join Date: Oct 2011
Location: new iberia
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Model: Cherokee
Ok so I was geting symptoms of haveing a bad NSS, for the last day are so, but on my ride home from work it seemed like to clear up. So I want for a nother lil run around my block once I let my jeep cool back down sence that's when symptoms are at the worst. Well about 2 min into driving it the brakes got hard brake lights came on than my jeep died. Now it doesn't start at all nothing. Checked all my fuses, taped my starter, did what I knew first to check for well I've got nothing.??? Anyone has a suggestion are can a bad NSS cause this to happen?
Junior Member
A bad NSS will not kill the engine.
You don't have driveability issues with a bad NSS.
A bad NSS will cause a No Crank situation and no reverse lights. That is all.
Sounds more like CPS than NSS to me.
You don't have driveability issues with a bad NSS.
A bad NSS will cause a No Crank situation and no reverse lights. That is all.
Sounds more like CPS than NSS to me.
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Join Date: Jul 2009
Location: New Jersey
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Year: 2000
Model: Cherokee
Engine: l6 HO
Herp Derp Jerp
Join Date: Nov 2011
Location: Parham, ON
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Ok so I was geting symptoms of haveing a bad NSS, for the last day are so, but on my ride home from work it seemed like to clear up. So I want for a nother lil run around my block once I let my jeep cool back down sence that's when symptoms are at the worst. Well about 2 min into driving it the brakes got hard brake lights came on than my jeep died. Now it doesn't start at all nothing. Checked all my fuses, taped my starter, did what I knew first to check for well I've got nothing.??? Anyone has a suggestion are can a bad NSS cause this to happen?
Herp Derp Jerp
Join Date: Nov 2011
Location: Parham, ON
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
I made a thread a while ago, but instead of bumping, I'll ask my question here.
My 96 cherokee has some trouble. when im driving, sometimes (it happens mostly when it's very cold outside) the cherokee will have trouble giving proper gas. even if I put the pedal to the floor, you can see the rpm go up and down, like if it was stopping giving it gas, and then giving some again. if I put it in 2nd or 3rd gear and make it rev alot, at one point the issue will stop but will start again 10 minutes later or when I restart the car.
no check engine light, no error codes. so I bring it to the garage and the guy told me he found out I needed a new o2 sensor.
so I was wondering, could this problem be caused by a faulty/old o2 sensor or is there something else? (we thought maybe a clogged cat or something like that, but I don't know if the guy checked that)
thanks!
My 96 cherokee has some trouble. when im driving, sometimes (it happens mostly when it's very cold outside) the cherokee will have trouble giving proper gas. even if I put the pedal to the floor, you can see the rpm go up and down, like if it was stopping giving it gas, and then giving some again. if I put it in 2nd or 3rd gear and make it rev alot, at one point the issue will stop but will start again 10 minutes later or when I restart the car.
no check engine light, no error codes. so I bring it to the garage and the guy told me he found out I needed a new o2 sensor.
so I was wondering, could this problem be caused by a faulty/old o2 sensor or is there something else? (we thought maybe a clogged cat or something like that, but I don't know if the guy checked that)
thanks!
Herp Derp Jerp
Join Date: Nov 2011
Location: Parham, ON
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Power brakes are vacuum boosted off the manifold, so if vacuum was lost they'd firm up after the reserve was depleted but I'm not sure if the brake light would illuminate... but if the booster hose came off you'd have a nice vacuum leak too, should send the RPM up a tad.
Isn't a loss of pressure in the lines what sets the brake light off?
Moderator of Jeeps
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Year: 1993 YJ Wrangler
Engine: 4.0 I6
Lights?
Power brakes are vacuum boosted off the manifold, so if vacuum was lost they'd firm up after the reserve was depleted but I'm not sure if the brake light would illuminate... but if the booster hose came off you'd have a nice vacuum leak too, should send the RPM up a tad.
Isn't a loss of pressure in the lines what sets the brake light off?