Question about Jeep Grand Cherokee

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I have a 04 Grand Cherokee 4.0 six. CE light comes on sometimes runs very rough. Rebooting the ignition sometimes helps. All environmentals seem to be a non-factor(ambient temp, moisture level, etc.)I am fairly sure it is a pcm issue. What aftermarket pcm's will replace the stock unit and do they completely replace what is stock? I have found some aftermarket chips online but I am not sure if they will solve my prob. Any help will be most appreciated.

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  • darryljr23 Apr 24, 2009

    Fault points to cylinder 3. Either fuel injector(I replaced, condition still exists), spark plug, injector wire, plug wire or pcm. I change plugs about 4000 mi before the problem first appeared. It was very intermittent at first but lately it has been happening more often. At times it will run fine for a week or more. CE light will go out.

  • chryslerguy May 11, 2010

    What is the stored fault code associated with the check engine light?

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Unplug and look very closely at the #3 injector wiring. It runs very close to a bracket on the throttle body and has been known to "rub through" and short to ground on the bracket. If that is the case just re-insulate the wire with electrical tape and route it away from the bracket. The rub spot will be very faint as it only takes one strand of wire to short the circuit in an intermittent condition. I hope this helps.

Posted on Apr 25, 2009

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http://www.jeepz.com/forum/engine/16923-six-cylinder-4-0-liter-jeep-engine-specs.html

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1 Answer

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