murple missfire

Asked by Apr 04, 2015 at 09:27 AM about the 2004 GMC Sierra 2500 4 Dr SLE 4WD Crew Cab SB

Question type: Maintenance & Repair

check engine light comes on after 3 hours of driving and only after refueling have replace plugs wires 1 coil filter and 3 gas caps

3 Answers

36,615

Sounds like you may have a problem with the purge solenoid in your EVAP system. https://www.youtube.com/watch?v=o_kxHJkzF-I

88,665

Do you get any other codes other than the multiple misfire? It still could be the purge solenoid. Try putting in a can of SeaFoam in the fuel see if that helps first.

60

It could be multiple things. you need an oscilloscope to see what your vehicle is doing. I came across an issue with a vehicle having random misfires and it was out of timing

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