Misfire at Wide Open Throttle
#1
Misfire at Wide Open Throttle
I drive an 2011 MCS with 39k miles on it. It starts fine, idles fine and runs smoothly throughout the RPM range. But when I engage the throttle wide open, I get hesitation and a half CEL. I scanned for codes and found one: P0302 Cylinder 2 Misfire.
Fluid levels are OK. I change oil every 7500 miles, and spark plugs and coils are within replacement interval. Air filter was changed at the dealership at 30k miles.
What's could be causing this problem?
Fluid levels are OK. I change oil every 7500 miles, and spark plugs and coils are within replacement interval. Air filter was changed at the dealership at 30k miles.
What's could be causing this problem?
Last edited by MNMLST; 04-12-2015 at 12:18 PM. Reason: More info.
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Um, I'm not sure what I did, but the problem went away.
As suggested, I swapped coils #2 and #3. I checked the wells and saw that they're free of oil. I didn't have a 14 mm 12-point deep socket, so I could't inspect the spark plugs. I put it all back together, making sure that everything is snug. Upon starting I noticed that the engine sounded and felt different. Better. I drove her to an open road and floored it! No stumbling, no misfires, no codes.
The tires chirped though
Thanks anyway fellas!
As suggested, I swapped coils #2 and #3. I checked the wells and saw that they're free of oil. I didn't have a 14 mm 12-point deep socket, so I could't inspect the spark plugs. I put it all back together, making sure that everything is snug. Upon starting I noticed that the engine sounded and felt different. Better. I drove her to an open road and floored it! No stumbling, no misfires, no codes.
The tires chirped though
Thanks anyway fellas!
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