Idles fast at times

Tiny
PEANUTS54
  • MEMBER
  • 1991 CHEVROLET SILVERADO
  • 175,000 MILES
I have replaced the throttle position sensor and the idle air control valve. Could it be the water temp sensor?
Thursday, September 15th, 2011 AT 11:48 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 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.
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Friday, September 16th, 2011 AT 1:08 AM
Tiny
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.
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Friday, September 16th, 2011 AT 1:29 AM

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