Question about 2003 GMC Yukon Denali
I would take a close look at the MAF sensor. Cleaning or replacing it should solve your problem. Just in case you are using an oiled air filter this is the cause of the dirty MAF sensor. Stop using an oiled filter and switch back to a conventional filter. You may also have a vacuum leak downstream of the MAF sensor. Either of these problems will cause a lean condition. Clean the MAF sensor with brake cleaner or a good electronic cleaner. I suggest you remove it to give it a good cleaning. Be careful not to damage the sensor while cleaning. Check all the vacuum hoses and replace as necessary. Do them one at a time as to not get confused.
Posted on Jul 16, 2010
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Posted on Jan 02, 2017
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