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I HAVE TWO F-115 4 STROKES ON MY 25 FT. BOAT.THE PORT ENGINE OFTEN STARTS SKIPPING, DROPS RPM TO ALMOST IDLE. THIS HAPPENS SOMETIMES UPON ACCELLERATION. SOMETIMES WHEN I'M JUST RUNNING AT CRUISE. SOMETIMES WHEN I HIT A BIG WAVE IN ROUGH SEAS. I CAN PULL THE THROTAL BACK TO IDLE POSITION FOR A FEW SECONDS, THEN PUSH FORWARD TO ACCELLERATE AND THE PROBLEM GOES AWAY...UNTILL THE NEXT TIME IT HAPPENS. IT NORMALLY HAPPENS SEVERAL TIMES DURING A DAYS FISHING. HAD NEW PLUGS, NEW OIL AND FILTER CHANGE. NEW FUEL FILTERS.IT'S A 2003 AND STILL IN WARRANTY, BUT THE SERVICE DEPARTMENT CAN'T SEEM TO FIX IT. ANY SUGESTIONS??????????
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It would have checked on the water with the computer hooked up to it in order to find problem -
Sounds like a fuel deliver problem. You have enough fuel to run at idle and under low load, but every time the engine has more of a load it uses more fuel(what's available in the float bowls. You throttle back, the carbs get a chance to fill back up, and the problem goes away. These are carb engines, right? (not fuel injection?) It could be as simple as a kinked line, or hard to find as a delaminating fuel line(internal to the fuel line). This can still happen on a fuel injected engine, as the rail pressure will drop.Comment
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