post #1 of Old 05-06-2008, 07:40 AM Thread Starter
Jubei
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Join Date: Mar 2006
Posts: 47
1997 Jeep GC Laredo will not stay running unless I give it gas.

1997 Grand Cherokee Laredo 4.0L, has about 150k miles. Do note this problem started occuring during the first start of the day, the previous day it drove fine with no problems. Here are the symptoms, it will turn over however unless I put the pedal to the floor and hold down the gas will it start. At that point I can adjust the gas pedal to make it idle at any rpm but my foot has to remain on the pedal. The moment I take my foot off the gas it immediately goes dead. It doesnt hesitate before going dead or anything it just goes dead. I dont have a CHECK ENGINE light, nor was the vehicle giving me any symptoms prior to this happening. The only current issue that I've had prior to this was a leaking radiator that Im forced to service every other day.

I've did some research and there are quite a few things that I can see that would MAYBE cause this problem however because its not hesitating or stalling while actually driving I'm hoping I can narrow things down a bit. One thing that has come to mind is could it be a Anti-theft malfunction. Any help is appreciated thank you.

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post #2 of Old 05-06-2008, 11:30 AM
gearhead1186
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something similair happened to my 5.2. Changed the TPS sensor and it was all gravy.
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post #3 of Old 05-06-2008, 12:30 PM
mghutton
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1996 ZJ 
 
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Location: St. Marys, Georgia
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Could also be a IAC (Idle Air Control) motor. Its an electric motor on the throttle body that controls the engine at idle. The plunger can get clogged or stuck and not allow the air to get into the engine while at idle. I had a similar problem on mine and took it off and cleaned it with Carb and Choke cleaner and has worked fine for 4 years now.
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post #4 of Old 05-06-2008, 01:16 PM
gearhead1186
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ditto. i actually changed both the TPS and IAC valve.
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post #5 of Old 05-06-2008, 01:38 PM
jonzj
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1996 ZJ 
 
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Location: Wetumpka, AL
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Mine did that after I disconnected my battery to do some electrical work. You might have to clean the throttle body out with a toothbrush and some carb cleaner.
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