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2005 yamaha 225 hp hpdi misses at low rpms

gamb201

New member
"I have a 2005 Yamaha 225 Vmax Hpdi that will miss as soon as I give the hotfoot some throttle. It idles fine (in neutral)and runs great on plane, but as soon as you put it in gear and troll or drive slowly, it will steadily miss. Sometimes, if I try to press the throttle on through the miss, it will fall on its face. If you back of the throttle and give it a quick shot of the hotfoot, it seems to clear it out enough to jump on plane. The problem is at its worst when the engine has had time to cool off. Does anyone know what the problem is?"
 
check

fuel pumps
o2 sensor


check

fuel pumps
o2 sensor
VST strainer
fuel filters
water in fuel
spark on all cylinders

you might need to plug it into YDS
 
I would suggest having it conn

I would suggest having it connected to the YDS first to see if anything comes up red. If not then you can use the winky blinkly to give you any trouble codes. You could have low pressure on the high pressure pump or clogged injectors. Not something the shadetree mechanic needs to get into.
 
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