97 Grand Runs like Crap HOLY CRAP - JeepForum.com

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post #1 of 4 Old 09-28-2011, 08:24 PM Thread Starter
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97 Grand Runs like Crap HOLY CRAP

Alright I bought a 97 Grand for my daughter who just had a baby and was allot bigger and better for her. It has the 4.0 and Automatic. I drove it to the hospital with no problems and the next day she said it runs horrible. So i told them to take it to check the codes cause she said the Check engine light was on. So they said....... Throttle position sensor, Crank Shaft Position Sensor, and Coil. So I replaced all of them..... the crank position sensor had a little greasy dirt build up on it......... think I may have a small rear seal leak since there is a drip on the bottom of the bell housing....... none the less..... The check engine light went out, and it ran pretty darn good..... the next day, they called and said it runs like crap, jerks then dies..... then its hard to start. Alrighty..... we cleaned the contacts to the computer with contact cleaner and brushes, then used some contact grease.......Then I zip tied the around the computer and cinched down the connectors..... It seemed to run really good for about 3 weeks then its back to running like Crap again...... no codes though....

So,,, thinking maybe the board has a problem or a bad or weak connection......... or????? anyone else had this issue?

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post #2 of 4 Old 09-28-2011, 08:55 PM
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1996 ZJ 
Join Date: Apr 2011
Location: Greenville
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my buddy had the same problem. is your on board computer. if you get that replaced that should fix your problem. is about 350?
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post #3 of 4 Old 09-28-2011, 09:34 PM
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The 96-98 JGC had bad PCM's used in them. The problems you describe, along with bad performance and hard starting are some of the symptoms. The ty-wraps cause the connections inside PCM to make better contact, but is only a temporary cure and usually comes back. Try tightening the connectors further and if the engine responds well, get a new PCM (re-man). Just be sure you get a warranty.
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post #4 of 4 Old 09-28-2011, 10:19 PM
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1997 ZJ 
Join Date: Dec 2006
Posts: 19,793
I wouldn't say they were bad as a blanket statement. A very small percentage go out like this and its common enough to be a standard diagnosis.
Usually the standard diagnosis procedure of a bad ecu/pcm is replacing parts with no positive effect.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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