Idle Problem - JeepForum.com

 
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post #1 of 6 Old 09-16-2003, 09:04 PM Thread Starter
Trainer
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Idle Problem

Need some help here...

I have an eratic idle problem, sometimes my Jeep will just decide to idle up to approx. 1500 or 1600 rpm. If I shut off the engine the idle drops back to normal, but if I dont it stays there...

No engine lights or anything abnormal.

Any suggestions???

Thanks
JP


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post #2 of 6 Old 09-17-2003, 05:20 AM
BamaJeeper
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Check the self diagnostic codes. Sounds like it could be AIS (Automatic Idle Speed) controller.

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post #3 of 6 Old 09-17-2003, 10:25 PM
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Yes check the codes. That can be caused by a air idle solonoid or throttle position sensor...usually.

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post #4 of 6 Old 09-18-2003, 01:50 PM
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the IAC usually doesnt fail, its usually one of the sensors that gives input to the ECM that controls the IAC. MAP, TPS, ECT are gonna be the main ones. A vacuum leak is also a slight possibility. However, like previously stated, my money is on TPS
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post #5 of 6 Old 09-19-2003, 05:25 PM Thread Starter
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Checked today, no codes...
how do I find out if its the TPS???

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post #6 of 6 Old 09-19-2003, 11:14 PM
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The common problem with the AIS is that carbon will build up on the cone and cone seat causing erratic idle problems.

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