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Old 09-28-2015, 09:27 AM
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Grand cherokee stalling

Okay so I have a 2000 grand Cherokee limited with a 4.0 engine in it. I bought it from someone who hadn't changed the oil in two years so I knew there was definitely going to be some fixing to do. I bought a whole new motor and put it in, but when it warms up to 210 and even a little while after it initially gets to 210, it starts misfiring. I managed to get it to an auto zone nearby to test it and it came up with a sixth cylinder misfire. I've got new gas, put gas cleaner in it, checked fuel pressure, got new spark plugs, pcm, I've changed my throttle position sensorposition and idle air control valve, checked the catylic converter, changed the coul pack and I completely redid the head and my engine looked great while I had everything apart. And it is STILL misfiring. When I accelerate it runs perfect. But when I'm in idle it is everything in the Jeep to not shut itself off. I'm at a dead end here, and I'm running out of options. Has anyone else expierenced this problem? How did you fix it?

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Old 09-28-2015, 02:29 PM
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Re: Grand cherokee stalling

Did you check the fuel trim ? STFT should normally be +-5% in idle. When its below -10 all the time, something is wrong.
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Old 09-28-2015, 03:49 PM
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Re: Grand cherokee stalling

How would I go about checking the fuel trim? Wouldn't buying a new pcm fix that problem?
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Old 09-28-2015, 07:25 PM
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Re: Grand cherokee stalling

The fuel trim must be checked using a scanner with live data. The primary input for the fuel trim to the PCM are the O2 sensors. A vacuum leak in the inlet or leak in the exhaust can negatively influence the fuel trim.
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Old 10-09-2015, 01:29 PM
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Re: Grand cherokee stalling

Since you rebuilt the engine or put a new one in; redid heads, I would definitely do a compression check on that cylinder if you haven't already. Hopefully that is not your issue after all the time you've invested into this.

Barring that it sounds like your problem is between the PCM and the Spark Plug. If you pull the plug out and run it, does it spark? Spark tester would be the safest thing to use when testing this and not leaving on the top of your engine somewhere.

If you cycle your key on, off, on, off, on. Is there a code that shows up on your odometer? Sometimes you may get codes here that may not show up on a Generic ODB2 reader. Since this thread is a little oldish, did you get the problem resolved? And if you did what did it turn out to be?
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