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My 1998 jeep cherokee classic has a high idle speed when in neutral and park what could the problem be

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  • Jeep Master
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Hi.

If idle is very hight , then it is often because of a faulty idle air control valve.The IAC valve is fixed to the back the throttle body by two torx screws. Disconnect the round shaped connector before removing the screws.

Before replacing the valve ensure that there is no vacuum leaks. Big vacuum leak can be spotted because of the hissing sound coming from the leak. To find small vacuum leak you will need an had tool gauge placed between vacuum lines(eg.Actron Vacuum Gauge).

In some case MAF and AIT sensor faults can also cause idling problem by determining an incorrect amount of air to be used in the mixture. In this case you often get a lean mixture code on the OBDII scanner.

The most common cause for erratically high idle is vacuum leaks and IAC valve problems.

Regards.

Ginko.

Posted on May 09, 2010

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