High Idle and Shut off

Tiny
GAROAM22
  • MEMBER
  • 1998 BUICK SKYLARK
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 200,032 MILES
When I start my car the engine idles high and revs until it dies out, the tailpipe is not attached and I already checked the vacuum lines
Monday, May 16th, 2011 AT 6:37 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The idle is controlled by metering small amounts of air into the system. You either a mechanical issue with the throttle plate dirty or getting stuck, a defective IAC (idle air control) or it has a vacuum leak elsewhere in the system.
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Monday, May 16th, 2011 AT 6:51 PM

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