P0303, easiest/cheapest fix to check first before checking more expensive fixes?

[cutchemist]

Cylinder 3 misfire. I'm guessing try checking replacing spark plug first then move to wires, boots and ignition coils? If the spark plug does not work, would replacing the coils, boots, and wires in 1 big step work the best?

 

[cutchemist]

Was also wondering if the crankshaft position sensor sits on a low point of the car? We had a snowfall in Winnipeg that had snow scrapping against the bumper on some street so I wonder if that came loose? I'll try to check that and my spark plugs since that should be easiest.

 

[cutchemist]

Just in case anyone searches for this in the future, changing the ignition wires got rid of the P0303.

 

[Tekk]

too bad im not throwing 303. i guess i should change my wires regardless lol

 

[vicvega]

I just went through this. Cleaned the Egr, Maf sensor the problem persisted. Changed coils, spark plugs and then it got worse. Changed the wires so far so good. I think the boot in cylinder #3 was cut up so I suspect that it might have been arcing inside causing the misfire. So the wires should have been the first thing to swap but since the coils and wires had never been changed it was due anyway.