150 HPDI loss of cylinder #3

[Holy Smoke]

If you look at the O2 reading at rpm's from the YDS snapshots it is:
RPM O2
5250 0.1
3575 .01
4950 .9

The data logger shows:

Rpm o2
650 0.05
700 0.78
700 0.37
700 0.48
700 0.57
700 0.4
700 0.8
700 0.71
800 0.2
750 0.82
700 0.26
650 0.37
700 0.46

700 0.65
700 0.79
700 0.79
4400 0.1
800 0.68
700 0.81
700 0.65
950 0.04
700 0.44
1100 0.23
1100 0.17
650 0.2
650 0.12


700 0.44
1100 0.23
1100 0.17
650 0.2
650 0.12
3300 0.02
750 0.81
700 0.79
700 0.5
650 0.11
3250 0.09
1350 0.02
1250 0.03

I am so confused

[rf246_sid]

learned a few things about my HPDI 150 in this thread...
" 2001 150 HPDI one cylinder not firing". Not saying it's your problem, but interesting info with some similar discussion.

[Holy Smoke]

Well I dropped the boat off at Joe's yesterday and had a nice conversation
with Rodbolt.

I cannot wait to see what is wrong with my motor.

Nice to have a real pro working on the boat.

[Holy Smoke]

The motor is fixed.

Rodbolt was happy to see my boat go away after having it for almost 4 months.

The weather on the outerbanks this winter had prevented them from water testing my boat as the power loss lost only showed at WOT.

I called them sissy's more then once When it was blowing 25 knots and 32 degrees outside and they did not want to water test it in the sound.

WOT runs in my 23 CC in 25 degree weather with 25 knots of winds in an open bay

Rodbolt went through both my motors and corrected all kinds of mechanic/ Previous owner reapirs and now both of my motors are in top shape

The cause of all this trouble was a bad number 3 injector.

When I was working on the motor trying to fix it myself I can to the same conclusion and pulled that number 3 injector and sent it out to be cleaned and tested.

I watched the injector company test and clean my injector and give it a clean bill of health. After installed the injector and the motor was still down on power is when I gave up, and sent the boat to Rodbolt.

Rodbolt spent a bunch of time looking at and testing other systems because I told him the number 3 injector was good and had just been serviced.

after they could find nothing else suspect they went back to square one
and swapped an used injector on the #3 cylinder and the boat came to life
5800 rpms both motors instead of 5400/5100 problem solved.

I am still mystified as to how the injector could fail between me having it serviced and installed.

I plan to go back to the injector cleaning company and have them retest that injector to see what the heck is going on.

They also rebuilt one of my lower units and replaced a prop shaft and this is the job you want a master tech doing.

I give Joe's Marine and Rodbolt 2 thumbs up.

The moral of the story is: sometimes it does not pay to do your own work

[rodbolt17]

couple that with that broken part of a fuel pump nipple in the VST inlet and the odd issue with the float and it was fun.
but yes we went 4 weeks running with snow, a Christmas holiday a few warrenty poweads including 1 F350,2 Volvo SXA repowers, and that boat wasn't much fun.
that and we lost use of the boat ramp in the industrial park for a month.
was still sick from last week so I did not make it in to work today, but it would not have mattered much with a 40* high and 25MPH NE winds and rain all day.
I think tomorrow will be about the same.

that injector should have tossed a code yet never did.
its mechanically stuck completely now but not when I did the injector and cyl drop tests.

last time I took it out stbd was 5K max.
that's when I had it placed on a work rack so I would not have the ramp issues.
spent most the morning Friday on my time and finnaly got it.

did you see that bit of smashed wire for #3 injector?
I spliced it but I don't like splices but without replacing the entire harness its the only fix.

the float issue was an oddity, did not happen until the last time I went to launch it.
that's when I saw your stalling issue.
took the VST apart again and that's when I found the float full of gas.
shake it and see.
never saw any EFI 2 or 4 stroke Yamaha with gas in the float before.
why it did not do it the first 20 or so times we ran the boat, I dunno.

was an interesting fix though.