CPS or oil????

[Jj231]

I have a 2006 Liberty with the 3.7 and 155k miles. I had the CPS code (p306 I think?)go off and changed the sensor twice. The first time was a generic sensor and second was a mopar unit. Neither one fixed the problem. The engine cuts out under hard acceleration and sometimes randomly dies. The jeep starts fine cold but seems to take a lot of cranking when starting warm.
The strange thing is that it seems to run good for about 100 miles after an oil change. Then it goes right back to the way it was. Is this possibly an issue with oil junk/sludge ******** with the CPS? And if so, what should I do?

 

[LibertyTC]

Welcome to the forums. Check Your code #.
P0306 Cylinder #6 Misfire See this link: https://www.jeepkj.com/threads/generic-chrysler-diagnostic-trouble-code-list.39860/
Spark Plugs been changed ? They should be changed out every 35-40k.

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[Jj231]

Welcome to the forums. Check Your code #.
P0306 Cylinder #6 Misfire See this link: https://www.jeepkj.com/threads/generic-chrysler-diagnostic-trouble-code-list.39860/
Spark Plugs been changed ? They should be changed out every 35-40k.

You must be registered for see images attach

Welcome to the forums. Check Your code #.
P0306 Cylinder #6 Misfire See this link: https://www.jeepkj.com/threads/generic-chrysler-diagnostic-trouble-code-list.39860/
Spark Plugs been changed ? They should be changed out every 35-40k.

You must be registered for see images attach

Ahhh it’s been a while now. I put plugs, wires and Coil packs on the vehicle when I got it. I guess it has been 60-70k miles now. I will check the code again today. It may of actually been p0340.

It’s just strange that clean oil seems to fix the problem for a short minute. Hmm

 

[jimbobwa]

It's probably p0340 (cam sensor) that's why the oil change fixes it temporarily.

 

[jimbobwa]

It's probably p0340 (cam sensor) that's why the oil change fixes it temporarily.

And have you checked it for sludge build up or anything like that yet ??

 

[Jj231]

No, I haven’t checked for sludge buildup

 

[Jj231]

So update, I have changed the Cam position sensor twice. Both times it fixes the problem for about a week or two. Then it fails again. Yes, these are autozone sensors since the mopar wasn’t available, but I think I have something else going on here.

 

[uss2defiant]

Change both CPS and CKP.