SkunkBoat
God
I've been troubleshooting one of my OX66 225s.
It had been running with even throttles but "stumbling" once in a while. I replaced the VST filter and that seemed to be fixed. About a week later we started with a similar problem
I have to advance the throttle further than the other to get same rpm and it tops out sooner and sometimes it jumps up or back down.
It also coughs out at idle a lot more than usual.
Verified I have spark on all cylinders.
Compression on all cylinders of both motors are 90, give or take 1.
Swapped all spark plugs from one motor to the other during the compression check process. Problem did not move to other engine so that rules out spark plugs.
I have repaired a funky connection of a coil that tricked me into thinking it was better for a run. Maybe it was a contributing factor. I ordered a replacement coil just to have for troubleshooting.
After multiple high speed runs in the river with the cover off we think its fuel flow.
I pulled out the injectors and sent them off to fuel injector man. (I think someone here recommended him)
First time ever doing this but it was quite easy.
I also ordered a filter screen that goes between the pressure regulator and the fuel rail.
Got the injectors back and installed along with a new filter behind the pressure regulator.
Pic below shows new & old filter and the filter removal tool
Made 4 runs in Manasquan River...WOW! Throttles matched up and she hauls ***. No hesitation. Never once sneezed out at idle.
It had been running with even throttles but "stumbling" once in a while. I replaced the VST filter and that seemed to be fixed. About a week later we started with a similar problem
I have to advance the throttle further than the other to get same rpm and it tops out sooner and sometimes it jumps up or back down.
It also coughs out at idle a lot more than usual.
Verified I have spark on all cylinders.
Compression on all cylinders of both motors are 90, give or take 1.
Swapped all spark plugs from one motor to the other during the compression check process. Problem did not move to other engine so that rules out spark plugs.
I have repaired a funky connection of a coil that tricked me into thinking it was better for a run. Maybe it was a contributing factor. I ordered a replacement coil just to have for troubleshooting.
After multiple high speed runs in the river with the cover off we think its fuel flow.
I pulled out the injectors and sent them off to fuel injector man. (I think someone here recommended him)
First time ever doing this but it was quite easy.
I also ordered a filter screen that goes between the pressure regulator and the fuel rail.
Got the injectors back and installed along with a new filter behind the pressure regulator.
Pic below shows new & old filter and the filter removal tool
Made 4 runs in Manasquan River...WOW! Throttles matched up and she hauls ***. No hesitation. Never once sneezed out at idle.
