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Old 06-08-2010, 08:33 PM   #1
Join Date: Jun 2010
Posts: 2
High Idle In Park

Hi, I am working on a 1999 Jeep Wrangler, 4.0L, Auto.
The Jeep idles fine about 99% of the time except, very rarely, when I put the transmission in park, the idle will raise to about 1500. I know that the idle is supposed to raise some when you go from drive to park, but not this much. Its hard to know whats causing it because it happens so seldom. What could be causing the high idle, that only malfunctions occassionaly? Thanks for any help. Oh, and it does it with the A/C turned off, so its not compensating for the compressor load.

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Old 06-08-2010, 10:38 PM   #2
For_4x4's Avatar
Join Date: May 2010
Posts: 61
I had a very similar problem with my old 97 turned out to be throttle position sensor.

02' TJ Sport, 4.0 I-6, NV3550, D44 rear
2'' Rubicon Express, 32x11.50 Cooper STT
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Old 06-11-2010, 11:05 PM   #3
Join Date: Jun 2010
Posts: 2
Well, two days ago, i removed the throttle body and cleaned it and the idle air control valve. The problem hasnt happened since, so ive got my fingers crossed.
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