2005 GMC Sierra, Multiple Misfires

This 2005 GMC Sierra came in with a poor run condition and multiple misfire codes stored. Code P0304 was one of the misfire codes stored. While looking at data I noted that misfires on cylinder #4 were markedly higher that most of the other cylinders. Normally when confronted with high misfire counts on this engine … Continue reading “2005 GMC Sierra, Multiple Misfires”

2004 Chevrolet Silverado 2500HD , 6.0 Vin U Misfire

Vehicle came in the shop, with the SES light on and an obvious misfire. Previous shops had replaced plugs and wires, removed cats, replaced both bank 2 oxygen sensors, the ECM and had swapped positions of coils and injectors for cylinder #6. I scanned vehicle and found a misfire present on #6 cylinder on a … Continue reading “2004 Chevrolet Silverado 2500HD , 6.0 Vin U Misfire”