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What can cause it to idle high?

Tiny
ANONYMOUS
  • MEMBER
  • 1989 DODGE VAN
  • 89,000 MILES
What can cause it to idle high?
Saturday, December 15th, 2012 AT 9:39 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Check for vacuum leaks and check the idle air control valve (IAC)
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Saturday, December 15th, 2012 AT 9:46 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,738 POSTS
Usually a vacuum leak. Check for loose, broken, or cracked hoses. Try pinching off the large main vacuum hoses. If the idle speed slows down, pinch off or unplug and block the smaller branch hoses until you narrow it down.
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Saturday, December 15th, 2012 AT 9:48 PM

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