It has a permanent P0301 that doesn't erase when codes are cleared
2011 Expedition 5.4l 3v
Started by swapping the #1 coil with the #2 coil, erasing codes and starting it up and rerunning the code reader, still get P0301, so swapped plugs between 1 & 2, erased codes ran it and reran codes got...
Can anyone see an issue here? Changed plug, boot and much cleaning of valves but still misfire in cyl 1. Happened randomly one day and never cleared. Thanks
I’ve had my truck for over 10 years and have never had an issue. But in the last month has been running rough. To the point of almost stalling and shudders sometimes. Also noticed a whistle noise that’s new. Scanned it and they said EGR Valve bought a new one and changed it. Same issue no change...
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