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Help...Johnson V4, 140 hp problem
Dear Declan, There are two answers in here that I like. It is either a coil or you are getting water in the cylinder do to a leaky head gasket. It is a cylinder at the top of the bank that would have gotten the hottest if the motor was ever heated. So you could have a warpage problem. Most likely not that complicated. Try replacing your spark plugs after you run the motor for a few minutes. Look for water on the plugs. If you have no water on the plugs start going through each of the coils and cleaning the ground connections and retrying them. Make sure they are good clean connections. That could be the only problem. If that works great. If it doesn't next step would be you have to figure out which cylinder is doing it. So with your engine cover off and the motor at an idle and run long enough that the problem is showing pull the boots off one plug at a time( use plastic plyers or good rubber handle plyers). Obviously the engine should drop off and sound different with each plug you pull off reconnect them if it does. If the motor doesn't drop off you have your bad cylinder. I would pull the coil and to check your work either swap it with another coil on the motor or take it to a outboard shop and have them do a coil test. Good luck |
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