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TPS vs ecu diagnosis help

Marvin willis

Jetboaters Admiral
Messages
1,436
Reaction score
855
Points
252
Location
Morehead city nc
Boat Make
Yamaha
Year
2018
Boat Model
AR
Boat Length
24
I’ve got a 08 ultra 250x 150 hrs. (Motor replaced at 106 hrs)It seems to always show the low battery voltage when I first start it (12.5volts when tested). Cranks right up. Here’s my issue. Runs perfect 99% of the time then randomly drops in power. Up down up down. Has cut off on others but not me. After u restart it, it will run fine again for a while and will start to miss again. Plugs are new. Happens at all gas levels. Sometimes it idles at different levels. But most of the time runs perfect. I did try to see how fast it would go one time and the speedometer went crazy after 50. Speedo Went down to 30 and bounced all over even though I was going way faster. Slight vibration after 65+ if it wasn’t missing.
 
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