2009 350 mag mis at wide open.

QBhoy

Fleet Admiral
Joined
Mar 10, 2016
Messages
8,348
Did you get a new diz cap ? It would be at the very top of my list of suspects.
 

Tadl

Cadet
Joined
Aug 22, 2020
Messages
10
Yes same issue. Thanks ill look back
Serial number 1A331912. Tried new distributor, cap, router,coil, module. And timing. What's next? Fuel pressure 40psi at 3000+rpm. 38 at idle. Trying crank sensor.
 

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,343
Trying crank sensor.
Crank position sensor is most likely not your issue. It's basically an on/off switch that senses a reluctor wheel on the crank, hall effect style. CPS is basically works or doesn't, no intermittent issue. It's not a bad idea to check it for wear, it can "loosen" on engines with higher hours and contact the reluctor wheel. It's rare on a boat engine but can happen, shims are available to achieve the .030" gap.

My guess is you're experiencing an intermittent ground issue somewhere. Start at the batteries and work your way to the engine
 
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