Start engine and it idles real fast I have.

Tiny
ANONYMOUS
  • MEMBER
  • 1989 BUICK CENTURY
  • 129,000 MILES
Start engine and it idles real fast I have changed the IAC valve
Monday, October 22nd, 2012 AT 1:00 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Check for a vacuum leak in the hoses and intake manifold gaskets. When the engine is still cold, spray water on those parts while the engine is running. If you see the water get sucked in and the speed slows down for a few seconds, you found the leak.
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Monday, October 22nd, 2012 AT 1:10 AM

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