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Old March 22nd, 2017, 21:47
cherokeefan_1 cherokeefan_1 is offline
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Join Date: Jul 2008
Location: Portland(for now)
Posts: 277
Re: Idle speed going through the ROOF on warming up : 97 XJ 4.0 HO

The IAC is allowing more air in and the computer is on a rich fuel mixture due to cold engine this higher revs. Pull the throttle body, clean with carb cleaner, reinstall. Fixed my issue with the same problem. You could also try using amsoil powerfoam or whatever but I'd rather all that gunk not go through my engine.
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