Cranked my 1998 xj this morning, and it was idling high.


When first cranked it was pushing 2000 rpm. After it warmed up, it is idling a 1500 rpm in park, and when it is in gear, it idles at 1000 rpm. The only thing I've done to it recently is I had new exhaust put on Dec. 23 (flowmaster series 40).

Any help would definitely be appreciated. The jeep has 95000 miles on it. Only mods are the exhaust and a 3 inch lift.

Thanks

 

Sounds like you may have a vacuum leak. Check all your vacuum lines first.

 

Take your foot off the gas

 

A vacuum leak is certainly suspect.

As well as a sticky idle air control (located on throttle body)

1. Search for vacuum leak

2. If nothing with #1, clean the idle air control and throttle body.

 

He said it idles lower after it warms up so im not sure of a bad iac. Possibly the step counter in the iac is bad causing the computer to think it is fully seated when its not.