idles fast at times

1991 CHEVROLET SILVERADO
175,000 MILES
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PEANUTS54
  • MEMBER
  • 12 POSTS
I have replaced the throttle position sensor and the idle air control valve. Could it be the water temp sensor?
Sep 15, 2011 at 4:48 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
The temp sensor tells the computer how to adjust air / fuel mixture. It could, but it is unlikely. Have you checked for vacuum leaks? If not, I recommend it.
Sep 15, 2011 at 6:08 PM
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PEANUTS54
  • MEMBER
  • 12 POSTS
Yes, all vacuum lines have been replaced! Thought that prior to replacing the idle air control valve. Seems to do it more after it has been running for an hour or more.
Sep 15, 2011 at 6:29 PM
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