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Idle flucuation

Tiny
RALPH001
  • MEMBER
  • 1995 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 4WD
  • MANUAL
  • 200,000 MILES
When engine is at idle it fluctuates between 600 and 800 rpm, going up and down. Use to be steady at 600.
Tuesday, January 24th, 2017 AT 3:52 AM

3 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,024 POSTS
Clean the throttle body and around the throttle blade. Clean the IAC (idle air control) passages out as well. Do not be surprised if yours is dirty like this.

Throttle body cleaning.
https://www.youtube.com/watch?v=Xnm9HWSzJ2E

Refer to the picture for the IAC passage.
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Tuesday, January 24th, 2017 AT 5:06 AM
Tiny
RALPH001
  • MEMBER
  • 2 POSTS
Thank you Steve W.
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Tuesday, January 24th, 2017 AT 5:37 AM
Tiny
STEVE W.
  • MECHANIC
  • 13,024 POSTS
No problem, reply back once you get it cleaned. It should do the trick (95% of the time) but it could be something else as well.
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Tuesday, January 24th, 2017 AT 6:57 AM

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