Auto Repair - Roadshow forum

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1996 JEEP Cherokee HESITATES when HOT!!!

by rodstiffington / September 7, 2008 4:54 AM PDT

No CODES, no nothing, just an intermittent hesitation when temps are over 85-degrees with A/C on. Problem started shortly after ECM had a Factory Software Upgrade performed. Sometimes when going up hills with slight pressure on the gas pedal, the engine will hesitate (like a bump), or when idling the engine will sound as if the plugs are fouled. When you press the pedal down further, the power comes back strong with no hesitation???!!!! 171K miles with no other issues. This Jeep has been great for 9 years! Any help would be appreciated.

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by mdworshak / October 29, 2008 7:41 AM PDT

did you figuare out the issue, my car has almost the same issues. Once the car runs for 15-20 minutes it starts to hesistate around 2000 RPMs and once you shut it off it runs fine again for a while.

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Jeep Cherokee "Missing" when warm
by rodstiffington / October 29, 2008 10:36 PM PDT
In reply to: Update

I believe it's the ECM. There is no other logical reason. It's as thought the car starts "missing" after a while, and I can only conclude the the signals from the ECM are not correct, and I've found that the ECM is the culprit for dozens of problems (including this one). I'm going to buy a rebuilt ECM from Autozone, or another parts store. They're 50% less than going with another source, and you can return the part at the store if it doesn't work. Good luck!

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need help, is the problem resolved
by charles113 / August 3, 2009 5:13 AM PDT

Did you resolve the missing problem. I have an identical issue with my 1998 Cherokee. No trouble light, just stumbling up a gradual hill or with extra load of Kayaks.

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need help
by dale404 / March 12, 2011 11:55 AM PST

what fixed the missing up hill or under a load?

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96 Jeep Cherokee ECM replacement
by kavonk / October 21, 2009 9:53 PM PDT
In reply to: Update

I need to know where the ECM is on my 96 Jeep Cherokee, in order to replace it and can I do it myself? It's a $20 part. Code: PO118

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