92 high idle

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Dec 1, 2012 | 08:32 AM

v8xploder

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Joined: Oct 2003

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From: Harrisburg, SD

92 high idle

just last night i pulled in the garage and put my 92 in park and the idle went up to about 1100.. i bliped the throttle and she came back down.. Checked for codes this morning and I only get 111. I popped on a vacuum gauge and it getting a steady 20in at idle. I dont hear a vacuum leak, I replaced all the vacuum lines with high temp silicon lines about 6 months ago.. IAC maybe? maybe clean the throttle body? Of course I go over a 2 years with no problems and the second i put the old girl up for sale she starts acting up on me. haha maybe she doesnt want to go!

Dec 1, 2012 | 10:10 AM

MadMatt65

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Joined: Jan 2010

Posts: 430

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From: Florida

Quote:

Originally Posted by v8xploder

I had a customer some years ago that had a similar problem...intermittent. He had a K&N filter also. Over time he had built up a "carbon" ridge behind one of the throttle body butterflys. When he had serviced his K&N filter he over oiled it and over time the oil collected on the carbon ridge. It was just enough to hold the butterfly open ever so slightly causing a high idle. I'm sure this was a fluke thing, but once we cleaned up his throttle body it was fine and the problem disappeared.
Maybe checking/cleaning the IAC will help also.
Hope this helps!