Engine Performance problem
2004 GMC Sierra V8 Four Wheel Drive Automatic 111000 miles
Ever since we had some cold weather my 2004 gmc sierra 5.3L started idleing rough, it seems to run fine when i'm driving its just when i'm parked or stopped it seems like it wants to die. This doesnt happen all the time some times it will idle fine and the engine light will go out. The diagnostic engine codes are p0131, O2 sensor low volts. P0171, system to lean. P0300 Random/multiple cylinder misfire detect. I think it may be the fuel pressure regulator according to some of the other post i've read can some one give me an idea where the fuel pressure regulator it is located on this make and modle truck. Any other suggestions would be helpful thanks
Same issue is happening with my truck. Everything identical. Have changed O2, spark plugs, spark plug wires, cleaned MAF sensor.
Cleared codes today, same codes came back.
P0300, P0171, P0131
Lean condition bank1 sec 1, random misfires, O2 input voltage low
Did anyone ever figure out the problem with this. Was it the fuel pressure regulator. Where is it located
have the same problem?
Thursday, February 12th, 2009 AT 5:28 PM