P0302 after changing plugs and swapping coils
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P0302 after changing plugs and swapping coils
Problem: P0302 Vehicle: 2011 Mazda CX-7 Steps taken so far:
The STFT is -5.5% idling and LTFT is 3.1%.
My theory is that there is a dirty injector or the misfire is due to the fuel system because the idle improved significantly after some fuel treatment which is not completely because I am still driving on the same tank I.e., I haven’t gone through all the fuel treatment.
The misfire is neither audible or physical, and I was very surprised for the code to come back after driving another for a day and a half.
- Replaced spark plugs
- Swapped coil packs to see if the misfire would move to another cylinder
- Added fuel treatment
The STFT is -5.5% idling and LTFT is 3.1%.
My theory is that there is a dirty injector or the misfire is due to the fuel system because the idle improved significantly after some fuel treatment which is not completely because I am still driving on the same tank I.e., I haven’t gone through all the fuel treatment.
The misfire is neither audible or physical, and I was very surprised for the code to come back after driving another for a day and a half.
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