Ok last year the engine (Mercury 90HP 4 stroke) would out of the clear blue, lose massive power and fall to around 3K RPM or so. Then it would recover on its own and run great. I was thinking it was the infamous VST float switch, like I have seen before. But yesterday, I replaced the float switch, the engine ran perfectly for 2 hours straight, and then I lost power again approaching the dock to put it up. Damn!
How can the engine run so hard and long the way it should, and then fall on its face like that...then recover and run fine again? I replaced the fuel filter and water separator last year, but i will go ahead and do it now. Plugs were replaced last year. Would be real nice if I could simply diagnose down to a fuel or ignition issue.
Is there anyway to retrieve the trouble codes from a Merc 4 stroke outboard? I dont see how gas could do this. If it were bad gas, I would think the motor would run badly all the time. Maybe I am wrong. Any other ideas to help address this issue?
Thanks
How can the engine run so hard and long the way it should, and then fall on its face like that...then recover and run fine again? I replaced the fuel filter and water separator last year, but i will go ahead and do it now. Plugs were replaced last year. Would be real nice if I could simply diagnose down to a fuel or ignition issue.
Is there anyway to retrieve the trouble codes from a Merc 4 stroke outboard? I dont see how gas could do this. If it were bad gas, I would think the motor would run badly all the time. Maybe I am wrong. Any other ideas to help address this issue?
Thanks