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The condition of your spark plugs can tell you a lot about what is going on inside your gasoline engine(s). Removing plugs and examining the tips and electrodes can help you diagnose problems and potentially save future repair costs:
When you first remove a spark plug, look for water droplets or rust. Either could indicate that water is getting into the cylinder, maybe caused by a bad head gasket, water in the fuel or, on inboard engines, a bad exhaust manifold or riser ....
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