2011 Mercruiser 350 MAG MPI - 1A627350
When cold engine runs about 750 rpm, and gradually reduces as engine gets up to temperature.
When temp gets around 130F the engine idle reduces and the engine will stall.
Engine will start immediately back up and idle around 530-550 and is rough. Doesn't usually stall again when it is warm, but it stumbles often.
But will run 5000 rpm WOT with no hesitation
Replaced IAC with an automotive (Ford Windstar), this IAC has a spring. Now because of the spring when it starts it revs up until the IAC takes over reducing the RPM's. Runs a little better but mostly around 550rpm or less.
Fuel filters replaced
Fuel pressure is 40psi and holding
Only other thing to note is raw pump hose came loose this summer, and we tried to idle back to dock until the PCM shutdown the engine around 200F. I don't think it overheated, but there was steam where the boat was filling up with water in the bilge.
When cold engine runs about 750 rpm, and gradually reduces as engine gets up to temperature.
When temp gets around 130F the engine idle reduces and the engine will stall.
Engine will start immediately back up and idle around 530-550 and is rough. Doesn't usually stall again when it is warm, but it stumbles often.
But will run 5000 rpm WOT with no hesitation
Replaced IAC with an automotive (Ford Windstar), this IAC has a spring. Now because of the spring when it starts it revs up until the IAC takes over reducing the RPM's. Runs a little better but mostly around 550rpm or less.
Fuel filters replaced
Fuel pressure is 40psi and holding
Only other thing to note is raw pump hose came loose this summer, and we tried to idle back to dock until the PCM shutdown the engine around 200F. I don't think it overheated, but there was steam where the boat was filling up with water in the bilge.