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1998 Chevy Venture High Idle

Tiny
BIGEARLY
  • MEMBER
  • 1998 CHEVROLET VENTURE
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
My van has a high idle after driving it. It happens a lot but not all the time. When it does I can shut it off and restart it and idles fine till the next time, I have no tac but it will travel 30 plus miles an hour with out touching the gas. Replaced the IAC motor and seem to act up more often. Engine light does not come on. I know light works cause it came on for a different problem. Thank you Ted
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Thursday, September 23rd, 2010 AT 2:22 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
You need to check a couple things. First check it thoroughly for any vacuum leaks and repair them. Then clean the throttle body. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle.
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Thursday, September 23rd, 2010 AT 2:41 PM

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