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1989 GMC Sierra fast idle after engine is warmed up

Tiny
SWORDFISH
  • MEMBER
  • 1989 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Engine turns over for about 10 seconds then finally starts seems to run ok and restart ok but won't come off fast idle engine is at operating temp, then gradually comes to a normal idle until I restart it and does it all over again checked linkage and for intake leaks, both seem ok. After engine is shut off for about 15 minutes it starts hard again.
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Thursday, February 25th, 2010 AT 5:26 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Clean out the idle air control valve and see what happens
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Friday, February 26th, 2010 AT 3:33 AM
Tiny
SWORDFISH
  • MEMBER
  • 5 POSTS
Etc sensor was bad, 10 dollars later it ran great
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Friday, March 12th, 2010 AT 1:37 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
TY for coming back with the fix
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Friday, March 12th, 2010 AT 2:33 PM

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