"I have a 5.0 mpi that runs gr
"I have a 5.0 mpi that runs great, but makes a very loud hissing noise at the air filter (I can definitely still hear it with the engine hatch closed...I had it looked at and a mechanic said that MPI's suck a lot of air and that is all it is (he didn't seem that bright)...well I saw an identical boat this wk end at the lake and had a listen...the very same MPI is very quiet. Do I have an intake leak (gasket) maybe throttle body gasket? What else might it be, and am I damaging my engine by running it. The best description is a very loud suction noise that varies with the rpm's (example: as I stop the boat and put it in neutral, the hissing is not as loud as when the engine is revving...you can hear the suction dissipate as the engine slows, but it never stops and is annoying and loud.
Any info. would be greatly appreciated"
"I have a 5.0 mpi that runs great, but makes a very loud hissing noise at the air filter (I can definitely still hear it with the engine hatch closed...I had it looked at and a mechanic said that MPI's suck a lot of air and that is all it is (he didn't seem that bright)...well I saw an identical boat this wk end at the lake and had a listen...the very same MPI is very quiet. Do I have an intake leak (gasket) maybe throttle body gasket? What else might it be, and am I damaging my engine by running it. The best description is a very loud suction noise that varies with the rpm's (example: as I stop the boat and put it in neutral, the hissing is not as loud as when the engine is revving...you can hear the suction dissipate as the engine slows, but it never stops and is annoying and loud.
Any info. would be greatly appreciated"