2003 Chevrolet Avalanche Repair Question
Topics covered: Four wheel drive, Fuel injector, Gas.
Mileage: No information provided.
Mileage: No information provided.
Asked on June 29, 2008
2003 Chevy Avalanche cylinder misfire
What would cause #4  cylinders to misfire at the same time. And suggestions for repair
Asked by Carl KingsburyAnswer
Replied on June 30, 2008
possible bad head gasket, bad injector wiring, bad PCM, bad plug wires, injectors need to be cleaned. Most likely a vaccum leak at the intake manifold. there can be a whole list of things. did you check to see if thre was spark at the plug wires and injector pulse at the fuel injectors. also check for a vaccum leak at that point of the intake