idle up and down

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Mar 26, 2005 | 09:53 PM

dsnell1004

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Instructor

Joined: Nov 2004

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From: swedesboro nj

idle up and down

sometimes the car idles high at times and other times it's right at 800 high idle around 1100. what could it be?

Mar 26, 2005 | 09:56 PM

Metamando

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Joined: Mar 2004

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From: Atlanta GA

Did U recently clean the throttle body? Mine is doing this too........

Mar 26, 2005 | 10:00 PM

mikey whipreck

Melting Slicks

Joined: Jun 2004

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First What year and what engine? There can be different cures for different years.

Did you try a search? This topic is covered pretty often, and there are numerous causes of an Idle Surge like you describe.
It seems the most common fix is cleaning or replacing the IAC valve...

Mar 26, 2005 | 10:04 PM

dsnell1004

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From: swedesboro nj

89 l98. what is the IAC valve?

Mar 27, 2005 | 01:06 AM

B84RADR

Burning Brakes

Joined: Apr 2002

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From: Spanish Fork Utah

Quote:

Originally Posted by dsnell1004

89 l98. what is the IAC valve?

Idle air control - by throttle body

Mar 27, 2005 | 11:41 AM

rick lambert

Le Mans Master

Joined: Oct 2003

Posts: 6,130

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From: seattle WA

Hope this site still works-it's great concerning Throttle body and IAC cleaning. http://www.dvcorvettes.com/clean_air_passage.htm

Gives you a very detailed-but easy to follow instructions with plenty illustrations, even a warning about making sure you use the right gasket.Seems most after market gaskets have 2-but only 1 will work properly.

Good luck

Mar 27, 2005 | 11:59 AM

dsnell1004

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From: swedesboro nj

rick, great info. thanks a mil

Mar 27, 2005 | 01:54 PM

TheCar

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Joined: Aug 2004

Posts: 109

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From: Just North of Boston Mass

I had the same problem. If you have high miles,Check to see if throttle plates are closing all the way with the engine running, if not the shaft bushings are worn and you will need to rebuild or replace the t-body. Sometimes they will close fine with the engine off but stick open slightly when running. You can get the t-body rebuilt with shaft bearings and bored out bigger at the same time.