YUKON

  • Tiny
  • yukon99
  • 1999 GMC Yukon
  • V8
  • 4WD
  • automatic
  • 115,345 miles

My 99 yukon is idling rough about 500 rpm?
i think is not timed right

Saturday, February 19th, 2011 AT 2:25 AM

7 Answers

  • Tiny
  • JDL
  • Expert
  • 16,290 posts

Does it run ok at highway speed? Clean the throttle-body and check the iac. Any applicable trouble codes? If you have the spider fuel system, they are noted for problems. The fuel poppets may need cleaning?

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Saturday, February 19th, 2011 AT 7:25 PM
  • Tiny
  • yukon99
  • Member

Yes it runs great like a dream. Just that is idling rough at a stop,
when the rpm is up by 700 is fine.
Whats the iac located?

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Sunday, February 20th, 2011 AT 1:17 AM
  • Tiny
  • JDL
  • Expert
  • 16,290 posts

The location is in the picture below.

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Sunday, February 20th, 2011 AT 4:09 PM
  • Tiny
  • yukon99
  • Member

Ok i'll check it. Oh by the way there are no codes showing yet.
Thanks. But it couldnt be the timing of a bit, cause they recently did some work before I bought it?

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Sunday, February 20th, 2011 AT 6:44 PM
  • Tiny
  • JDL
  • Expert
  • 16,290 posts

Did they give you any warranty, if so, talk to the people that did the work. What kind of work was done?

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Sunday, February 20th, 2011 AT 6:49 PM
  • Tiny
  • yukon99
  • Member

Yeah, I think they change the head gaskets. And I think they did something wrong or put something in the wrong place.
But yea im heading up there on saturday morning.

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Sunday, February 20th, 2011 AT 9:38 PM
  • Tiny
  • JDL
  • Expert
  • 16,290 posts

Good idea.

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Monday, February 21st, 2011 AT 3:58 PM

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