1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 311Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 311

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FUEL INJECTION DISASSEMBLY AND REASSSEMBLY
1 Clean Knock Sensor with dry cloth, paying special attention to threads on base2 Inspect surfaces of Knock Sensor for signs of wear or physical damage