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Why does my Chevy Astro idle high?

Tiny
HELPLESSASTRO
  • MEMBER
  • 1998 CHEVROLET AVALANCHE
  • 135,000 MILES
I replaced intake manifold gasket and did not remove throtle body from manifold. Put new gasket on plug every thing back in and now idles like I got my foot on the pedal all the way down. Please someone help.
Sunday, November 13th, 2011 AT 1:23 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
Have you checked the idle air control valve? Also, check to make sure the TB doesn't have a vacuum leak.
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Sunday, November 13th, 2011 AT 2:00 AM
Tiny
HELPLESSASTRO
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  • 3 POSTS
Where is the IAC located and how do I check it.
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Sunday, November 13th, 2011 AT 3:46 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,164 POSTS
It is located on the throttle body. Remove it and you will see a pintil valve at the end of it. That valve is what allows air to enter the engine when the throttle plate is closed so the engine can run. If adjusts in and out to maintain idle based on info from the computer. Once it is out, have a helper turn the key on and off. It should move. If it doesn't, it's bad. Also, make sure there is no carbon build up on it.
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Sunday, November 13th, 2011 AT 3:51 AM
Tiny
JJIMENEZ8891
  • MEMBER
  • 29 POSTS
Agreed also make sure that the gasket to intake sealed correctly so that you dont have a leak their either.
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Sunday, November 13th, 2011 AT 4:13 AM
Tiny
HELPLESSASTRO
  • MEMBER
  • 3 POSTS
IAC works and is clean throttle stays open how do I get it to close.
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Sunday, November 13th, 2011 AT 8:10 PM

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