Mechanics

GMC YUKON RPM PROBLEM

1999 GMC Yukon • V8 4WD Automatic • 115,345 miles

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


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Yukon99
February 19, 2011.



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?


JDL
Feb 19, 2011.
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?


Tiny
Yukon99
Feb 20, 2011.
The location is in the picture below.


JDL
Feb 20, 2011.
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?


Tiny
Yukon99
Feb 20, 2011.
Did they give you any warranty, if so, talk to the people that did the work. What kind of work was done?


JDL
Feb 20, 2011.
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.


Tiny
Yukon99
Feb 20, 2011.
Good idea.


JDL
Feb 21, 2011.