I have a 2002 PCM Inboard (5.7L HO, Throttle Body fuel injection) in a MB Sports Tournament ski boat. I store the boat at my buddy's for the winter and recently took it out of storage.
The engine has 850 hours and has been totally bulletproof through the years (lots of passes through the slalom course) with normal maintenance by me. Before winterizing, oil was changed with a filter, new fuel control cell filter, new plugs with dist. cap and rotor. The tank was topped off with some Marine Stabil added. I didn't have the precise amount I needed so I added the rest of what I had, to treat about 10 gallons. I know, my fault. And finally, the engine was fogged.
That was last Oct.
This past weekend I fired it up for the first time and noticed a very rough idle. Putting in gear, the roughness continued and the boat was down on power, only revving to 3900 rpm, 40mph WOT. This boat usually accelerates like a Big Block muscle car, so something is definitely going on.
My first thought is fuel, being bad and not completely treated. Michigan uses 10% ethanol in all their "normal" fuel's so that's my first concern. Would "some" treatment be enough to keep the gas in good shape for that amount of time?
Your thoughts are appreciated.
RickR90s
The engine has 850 hours and has been totally bulletproof through the years (lots of passes through the slalom course) with normal maintenance by me. Before winterizing, oil was changed with a filter, new fuel control cell filter, new plugs with dist. cap and rotor. The tank was topped off with some Marine Stabil added. I didn't have the precise amount I needed so I added the rest of what I had, to treat about 10 gallons. I know, my fault. And finally, the engine was fogged.
That was last Oct.
This past weekend I fired it up for the first time and noticed a very rough idle. Putting in gear, the roughness continued and the boat was down on power, only revving to 3900 rpm, 40mph WOT. This boat usually accelerates like a Big Block muscle car, so something is definitely going on.
My first thought is fuel, being bad and not completely treated. Michigan uses 10% ethanol in all their "normal" fuel's so that's my first concern. Would "some" treatment be enough to keep the gas in good shape for that amount of time?
Your thoughts are appreciated.
RickR90s