Posts: 295
Location: Southern Ontario, Detroit River and Lake StClair | Most of the larger Mercs that I've delt with had an "auto shutdown" to speak off that wold limit your RPM's to 2000 if there was some kind of problem like a water pump failure or an oil injection pump failure. the last one was a 200 EFI. It did pretty much what you said except it would run for a bit first then just die out when on plane and then wouldn't go over 2000 RPM. It turned out to be a bad impeller in the water pump. It was spitting water from tell tale but not putting out enough pressure when on plane to keep things going.
Good Fishin'
Tim
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