idle speed on my 1996 GMC SIERRA pickup is very high , what can cause this?

1996 GMC SIERRA
100,000 MILES
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HIVES
  • MEMBER
  • 1 POST
Its a 5.7 engine and the idle speed is very high always and theres nothing sticking that I can see.
Nov 16, 2011 at 4:08 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
check the throttle body gasket. common failure that causes a high idle condition. Also check the EGR valve here is a video to show you how.

https://youtu.be/DqUCbbKdWf4

Check out the diagrams (Below). Please let us know what you find.

Cheers, Roy
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Nov 16, 2011 at 4:13 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
I had this problem It was the EGR valve.
Nov 16, 2011 at 4:14 PM
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