2002 5.7 350 Mag MPI Mercruiser- reported by marina #7 cylinder low compression (30psi), won't start, spark plugs broke off during removal. Motor has history of water ingestion/head replacement, initially due to incorrect boat builder installation (riser height). My uneducated guess is the same thing has occurred again.
Can anybody give me ALL of the symptoms of a bad/burnt piston, so that I can go ahead and prepare myself for the bad news I expect to receive when the head get's pulled..??..thanks
Also, can I expect the codes from the ecm to tell me anything..??
By the way, the boat came in to the marina under it's own power. The only thing unusual about the delivery was on start-up the engine appeared starved for fuel, cycled the throttle a few times and it started up and ran smooth and cool over to the yard.