2013 Volvo penta 5.0 EFI SX

by Charlie
(Ft. Lauderdale Fl.)

I was away for 5 weeks my boat is stored on a lift my batteries went dead the engine well filled with rain water.

I pumped out the water replaced both batteries let the engine compartment air out for days. A week later I started the engine it started right up but ran rough like an ignition miss. At 1000 rpm the check engine light and red triangle light and horn went off. I retarded the throttle to idle engine is stayed on, engine idling rough.

Went for an hour ride at 1200 to 1600 rpm engine operation smoothed out things seemd normal. The next day I ran the engine at the dock the engine miss returned and engine lights came on.

Engine is due for spark plug ignition wires replacement I will accomplish this first. Also oxygen sensors are due for replacement. Any ideas what I should do next?

Any advise would be appreciated.

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