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Service Warning alarm SPN: 65597 FMI:7 system not responding properly


Swingingbridge

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Have been getting this service warning: Service Warning  with an active engine fault code of SPN: 65597 FMI:7 system not responding properly. Know it has something to do with cylinder 7 misfire but can’t diagnose problem. Changed spark plugs, swapped wires to different cylinder, swapped direct to cylinder ignition distributor modules. Boat has Monsoon 409 6.0 l engine which has direct cylinder ignition modules. Still coming up with same active engine fault so can’t be plugs wires or ignition module then because code didn’t switch after I swapped parts. Boat runs smooth with no load but with a load on engine can’t get above 9.5 mph with full ballast at full throttle. Anybody have any recommendations I am out of ideas. Thank you.

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Thanks Going to try swapping injectors tonight to see if the error code changes to that cylinder. Gas is always fresh and new from good supply. 

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  • 1 year later...
Rich777

Did you ever figure out your issue? I have same thing going on with mine right now 

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