CHECK ENGINE LIGHT

renomn1 · Jan 15, 2009

Hi. I have an 01 xj stock with a k&n fipk, !00,000 miles. The check engine light comes on after its been driven for an hour or so with codes saying random multiple cylinder misfire, cylinder 3 misfire, and cylinder 1 misfire. once it also said cylinder 2 and 4 as well as 1 and 3. I've had the codes erased several times when I've tried to solve the problem. I bought the jeep at 88000 miles and changed the plugs. after that the codes started popping up, I checked the plugs, the gap, it was good but there was corrosion on the plugs from the cheap di electric grease that I used so I went and bought some Permatex and cleaned everything. SOMEBODY HELP PLEASE?1

GrimmJeeper · Jan 15, 2009

01 is coil on plug ignition right? maybe you have a coil or two going out.

renomn1 · Jan 15, 2009

yup it is, and the coils are on a strip that looks like you can't seperate just one coil from the strip, and I hope not!

kdailey4315 · Jan 15, 2009

What kind of plugs are you using?

hubs97xj · Jan 15, 2009

Heat soak? Wasn't it the later models that had issues with misfires due to the injectors getting hot? I'm pretty sure the TSB is around here somewhere- might look at that.

renomn1 · Jan 15, 2009

champion copper plugs, and thers a heat shield between the intake and injectors and its below zero

hubs97xj · Jan 15, 2009

I was referring to the heat the engine generates, not the temps outside.

birchlakeXJ · Jan 16, 2009

Random misfires can also be indicative of a vacuum leak. Intake manifold, throttle body, check all CCV plumbing. Vacuum testing if you get stuck may be helpful here.

renomn1 · Jan 16, 2009

i'll check, thanks

winterbeater · Jan 16, 2009

hubs97xj said:
Heat soak? Wasn't it the later models that had issues with misfires due to the injectors getting hot? I'm pretty sure the TSB is around here somewhere- might look at that.

It's not injector heat soak when it's zero outside. That is a problem of low speed running when hot outside or more commonly, restarting when hot after a few minutes.

winterbeater · Jan 16, 2009

Have you worked the coil rail to wire harness connector back and forth (plugged and uplugged it) to make sure that connection is not going bad?

renomn1 · Jan 16, 2009

winterbeater said:
Have you worked the coil rail to wire harness connector back and forth (plugged and uplugged it) to make sure that connection is not going bad?

yeah, every time i've tried to solve the problem

renomn1 · Jan 16, 2009

i'll try again though

renomn1 · Mar 7, 2009

i also had a code pop for the tps prior to this but it went away and i had no problems until this

birchlakeXJ · Mar 7, 2009

Test your throttle position sensor and also look for a vacuum leak. A "moderate to major" leak can create random misfires.

winterbeater · Mar 7, 2009

I just wonder if this could be the old CKS (crank position sensor) issue. Or it could be the CPS (cam position sensor) timing. It's all covered in this thread.
http://www.naxja.org/forum/showthread.php?t=979567&highlight=Crank+Position+Sensor

MMIXJ · Mar 21, 2009

birchlakeXJ said:
Test your throttle position sensor and also look for a vacuum leak. A "moderate to major" leak can create random misfires.

hmmm...
see this thread (please):
http://naxja.org/forum/showthread.php?t=989357

i never was able to find the source for my EVAP "moderate to major leak" check engine light problem; sounds like they (misfire) could be related?

winterbeater · Mar 21, 2009

Did you check your evap hoses? Sometimes they come off underneath. I had one car where it hung underneath and got cracked too.

CHECK ENGINE LIGHT

renomn1

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GrimmJeeper

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renomn1

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kdailey4315

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