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A recent increase in detergent additives to gasoline has resulted in an increase in the accumulation of deposits inside the engine's combustion chamber (this type of deposit will be hereinafter referred to as “CCD”;Combustion Chamber Deposit). Along with this tendency, authors have observed an engine noise generated during warm up, which may be attributable to the CCD accumulation. It was reported that the engine noise was identified as carbon knocking caused when the piston and cylinder head physically come in contact because of these CCDs(1X2) This paper deals with another noise generated by the CCD trapped between the piston ring and piston ring groove.