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2003 Yamaha 0x66 fuel injected. strange problem
I have this motor on a 2003 champion 193. when I take off it will run right up to about 60 and no further. if I let of the gas a couple times and punch it back down its like it found a new gear and I can hit 68 mph. does this about 50% of the time. any guesses?
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i have .5v at idle and 4.05 at wot
Last edited by techman; 09-17-2019 at 03:47 PM.
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5V - How are you measuring? There is a specific procedure to check. You should see anywhere from .48v - .6v at idle.
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sorry.. should have said .5v at idle
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Moderator
I'm guessing fuel delivery is the problem...
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Mine was doing something very similar. I trouble shot for a long time. Mine ended up needing new plugs.
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i have new plugs and cables
checking vst filter tomorrow too. hoping I can find one local. looks easy to replace
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me too.. when it's running good it does pretty well. about 68 mph at 5800 rpm. about 500 rpm and 8 mph less when it's not.
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Sounds like its going into failsafe. Mine was the knock sensor but any electrical issue can cause that.
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Thanks for all the input. cleaning the o2 sensor took care of it. smoother idle and smoking less at idle and picked up another 3 miles an hour.