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Old 06-08-2018, 01:18 AM
dwkfym dwkfym is offline
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#4 spark plug fouled. Temperaturw differences between plugs

My #4 plug is always sooty black when I pull it out. The other plugs are normal. This happens within 15 mins of idling. Also, my #1 plug is cool enpugh to touch, and the plugs get hotter as they get closer to the tramsmission. #4 plug is hottest to the touch.

Points are set around .020. I ordered new plug wires, but im not sure if that is the culprit.

I am thinking thr #4 cyl is missing and that my cooling channels to that end of the motor are clogged somewhere.

Background-- boat and enginr got flooded last year. Had to replace all electricals and rewire engine. Havent left dock yet-- just did the last oil change. Had marvel mystery oil at the valves (via plug hole) and little bit in the fuel. Running without thermostat amd with manual valve at the bypass. Muriatic acid flush done mid season last year.

Anything else that could be causing these symptoms? Any way to clear coolant passages without engine disassembly?
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