'94 GC Laredo won't idle when warm - JeepForum.com

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post #1 of 2 Old 08-16-2012, 12:47 PM Thread Starter
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Join Date: Mar 2010
Location: utah
Posts: 50
'94 GC Laredo won't idle when warm

Just the past few days, my '94 GC Laredo with a 5.2 V-8 has been idling roughly when it's warmed up, the air conditioning is running and it's hot outside.

If I pull into a store parking lot and put the trans in Park and shut off the A/C, the idle will shoot up to exactly 1500 rpms for 3 or 4 seconds, then drop down suddenly and the engines tries to die. It normally idles and purrs like a spoiled kitten, because it is, from the new water pump and injectors to regular tune-ups and oil changes, clean air throttle bodies and butterflies, etc.

Fresh gas in the tank 3 times since it started doing this.

Again, it idles smoothly at 750 rpms until I drive it with the A/C on for a while, then it idles roughly when I stop at a stop sign or red light and tries to die. If I shut off the air while sitting there idling roughly, the idle shoots up to exactly 1500 rpms for 3 or 4 seconds, then tries to die.

The truck starts right back up if it does die. It's not stranding me anywhere, so I doubt it's anything serious.

Anyone have a quick check list of sensors, tips, hints before I tear into it blindly?


billie789 is offline  
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post #2 of 2 Old 08-16-2012, 12:54 PM
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1993 ZJ 
Join Date: Jul 2012
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Mine does the same thing when its hot. I was told that when the computer was replaced it was put in wrong and cracked. So when it heats up it does it.
inkspot88 is offline  

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