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Unread 12-09-2011, 06:25 PM   #1
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1995 ZJ 
Join Date: Mar 2011
Location: weed, ca
Posts: 10
rough idel

ok maybe someone can help me out..... i have a 95 jgc with a 5.2 and last year when i first got it, it didnt run... long story short i put a used pcm in it and it ran awesome, i just started messing with it again and its been sittin a while, but the reason i parked it is cause it started running like ****. i drove to town one day and it started heatin up on me, come to find out the water pump went out so i put a new one in and ever since its got a rough idel when it warms up. i put new plugs, wires, cap, and rotor and even retimed it again from tdc. i have tryed everything i can think of, but i dont know 318 very well and dont know anything about pcm's and what go along with them but i learn fast and i am outta ideas.... can anyone help please.

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Unread 12-09-2011, 07:13 PM   #2
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1993 ZJ 
Join Date: Nov 2011
Location: dahlonega, ga
Posts: 448
Check the Idle air control valve, the throttle position sensor, and give the throttle body a good cleaning. Can use an old toothbrush along with throttle body cleaner(not carb cleaner) to clean the cylinder of the tb.
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Unread 12-09-2011, 08:11 PM   #3
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1998 ZJ 
Join Date: Aug 2010
Location: Virginia
Posts: 3,736
When you did the wires did you route them correctly ? If they are routed wrong meaning touching eachother and crisscrossed it can cause idle issue and lots of other stuff
2013 6.2 V8 Camaro SS 3,000 miles :-)
1998 5.9 V8 Limited Platinum ZJ 151,xxx miles
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Unread 12-09-2011, 09:39 PM   #4
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1993 ZJ 
Join Date: Oct 2008
Location: Lima, Ohio
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Re-timed as in you attempted to adjust the timing? There's your problem.
Want to swap an NP242 or NP231 into your ZJ? Here's how:
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