I read a few threads here on knock readings and cant find a solution. My problem is cylinder 4 is picking up knock sum and also pulling between -1 to -4.9 timing. My tuner suggested it could be a cracked ringland or an external noise. We cant seem to locate the external noise. Could it be a cracked ringland causing the knock reading? Can it be tuned out?
Side note: Not smoking and good compression across the board. New spark plugs. Also datalogged with no knock event in 3rd gear WOT.
Tomei Type-S FPR