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90 chevy 2500 won't hold idle

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New User

Dec 25, 2010, 5:48 PM

Post #1 of 4 (2327 views)
90 chevy 2500 won't hold idle Sign In

Truck otherwise runs great, just wont idle when it warms up. has 145000 miles any help would be appreciated!

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Dec 27, 2010, 8:31 PM

Post #2 of 4 (2309 views)
Re: 90 chevy 2500 won't hold idle Sign In

Vacuum leaks or in need of professional injection cleaning or a host of possibilities. Telling us what engine would help,


New User

Jan 3, 2011, 5:11 PM

Post #3 of 4 (2283 views)
Re: 90 chevy 2500 won't hold idle Sign In

sorry, 5.7 L. 4x4 throttle body fuel injectio,n. Just changed the IAC did not help, now I'm being told it may be the throttle control sensor, don't want to keep guessing these sensors are getting expensive,it has 146,000 miles,not worth alot.

Hammer Time
Ultimate Carjunky / Moderator
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Jan 3, 2011, 5:43 PM

Post #4 of 4 (2278 views)
Re: 90 chevy 2500 won't hold idle Sign In

There are a few different things that go wrong with these. First, you should have given the throttle body a good cleaning before changing the IAC. Get some carb cleaner and an old toothbrush and scrub the back side of the throttle plate and the inside bore of the throttle body.

Some other things that go wrong are the base gaskets for the throttle body can go and in some cases the throttle body itself leaks internally. Sometimes they leak vacuum and sometimes the leak EGR into the intake.


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