Question about 2002 GMC Yukon XL
My 2002 had same problems and to fix, I loosened the hose clamp on the throttle body air intake to air box hose. Then opened the butteryfly by hand and used throttle body cleaner, used carb cleaner on another, and removed all the black grime that collects around the throttle body butterfly. About every forty thousand miles i have to do this. I have 123k on mine now and have done it three times. Fixes the low idle, dying in reverse, lite flicker and alternator dropout.
Home it works, if it does
Posted on Dec 20, 2009
This is the exact problem I had. I checked my battery and alternator. I cleaned my egr. I changed my wires and plugs. Finally, I found a solution!!!! The throttle body has a small port on the top of it that continuously allows air to flow past the open and close adjustment flap. I am sorry but I am not very technical. What you do is pull off the air filter hose attached to it and take a engine cleaner and clean and spray out the carbon out of the small port. I did this and instantly my truck stopped idling bad. I found out the EGR port is connected to this and carbon would clog the hole, so the engine would start to stall at low idle speeds.
Posted on Jul 15, 2009
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