View Single Post
Old 04-19-2010, 09:32 AM   #2
A990 racer
Join Date: Mar 2002
Location: Chestertown, New York
Posts: 16,533
Thanks: 13
Thanked 320 Times in 314 Posts
Re: 2001 GMC Yukon Poor Mileage

You could do a full scan and look at fuel trim readings to see if the engine is running rich.
maxwedge is offline   Reply With Quote