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#6 plug carbon 2011 335 fresh engine rebuild 1st WOT


M

#6 plug carbon 2011 335 fresh engine rebuild 1st WOT

Still in break in process with factory tune. Engine runs perfectly but #6 spark plug has a good amount of carbon while the rest of the plugs are clean. #6 has new injector that was code to the DME. Anyone else notice more carbon on #6 plug on their N55?
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