Engine Performance problem
2000 GMC Sierra V8 Two Wheel Drive Automatic 126000 miles
P0171 and P0174 trouble codes.
First time I got these codes, cleaned MAF, changed air filter, new gas filter, and cleaned EGR. Drove thru the drive cycle, everything good. 2 weeks later, got them again. Cleared codes, changed spark plugs, ran injector cleaner thru 2 tanks full of gas, drive cycle good no codes or pending codes. Passed State Inspection. 2 weeks later, light and codes again?
O2 sensors working.
Saturday, February 14th, 2009 AT 7:31 AM