2000 200hp ox 66 fuel injected

[geckoman7783]

motor spins over real good but dont start noticed plugs gas fouled very quickly the spark is very strong any suggestions

 

[Fishin Technician]

Re: 2000 200hp ox 66 fuel injected

Geckoman,
You ever get this motor running?
Not to hijack your thread, but I think
I have the same problem and I fear it's
the computer - although I never heard of
one going bad. I called the repair shop
today and they said they could look at
it after Memorial Day

 

[rodbolt]

Re: 2000 200hp ox 66 fuel injected

I guess some simple testing would just be to simple.

 

[Fishin Technician]

Re: 2000 200hp ox 66 fuel injected

Hello Rodbolt,

Glad you are here!
Yes, I was hoping for a miracle , but I don't mind working on it. Especially if you are willing to help me out. I know you know this great motor very well.

Here is what I have and done so far:
The motor is a 1998 S225txrw I have been running for 3 seasons.
She cranks and starts very rough for 1-2 seconds then dies.
winky/blinky is saying 33:timing advance for warm up.
It will do the same thing for a few tries then eventually
fouls the plugs and wont even start rough for that 1-2 seconds.

First thing I did was put in new plugs and try fresh fuel ( with ring-free of course). No help.

Checked fuel pressure: 36psi and holds during attempts to start.
Checked TPS according to the manual:Input voltage 5VDC.
output voltage with throttle linkage disconnected 0.51DC. However with throttle linkage hooked up 0.67VDC.
Also has nice gradual changes up to WOT at 4.53VDC.

Checked/cleaned the VST filter and the pressure reg screen anyway and they
looked ok. I put a new VST and fuel filter and lift pumps in last year so
I have been doing the maintenance there.

I checked for spark on all cyl with a generic spark tester and had spark on all 6 cyl while cranking. Also checked the compression and they all show about 100psi ( not sure the guage is accurate )

Also I did the O2 sensor maintenance last season. I was headed there next to check the connecting tube, but since it doesn't start I can't really do the sensor test with the DVM can I?

I searched on some previous posts and found I should check the plug cap resistence ( which were replaced last season as maintenance ).
Also, I see I should pull the injectors and inspect them?

I was also looking at the CDI output and the Pulsar coil output tests which have a spec for cranking, so I could put my DVM on while turning it over. Would a DVM work for that? Looks like it would be VAC and just go from the test lead to engine ground?

I was hoping I could get to at least some of those checks tomorrow after work. What would you do at this point? BTW, I am ready and willing to work on it, but my mechanical skills are limited. I am pretty good with a meter though. I would be happy to take it in to a pro, but so far after Memorial Day is the waiting list. One lat question: Is it worth throwing a timing light on it if I can find it in the garage?

 

[rodbolt]

Re: 2000 200hp ox 66 fuel injected

carefully inspect the lift pumps for bad diaphrams, also dissconnect the VST vent line from the intake manifold, if the needle leaks it floods the intake.
code 33 simply means the engine is warming up, as it displays codes in order of lowest to highest I dont see an issue.
to check for leaking injectors open the throttle fully, turn the key to on, unplug the blue pump wire and ground the pump side of it, pump will run, while the pump is running look into the throttle bores with a flashlight and check for leaks.
somehow your getting way to much fuel in the intake manifold.
lift pumps,VST needle valve, possible bad diaphram on the regulator allowing fuel to go to the intake via the vacum tube or a leaking injector, no other way to place fuel in the crankcase.

 

[Fishin Technician]

Re: 2000 200hp ox 66 fuel injected

Double post...see below

 

[Fishin Technician]

Re: 2000 200hp ox 66 fuel injected

Rodbolt,
Thanks again for the inspiration. Between work, company over all day Sunday, Rain for the next 36hrs, I finally got out there this afternoon when the rain let up.

First off I pulled all the plugs and checked all the caps were good 4K-6K.
I was surprised to see the plugs didn't look that wet, but I cleaned them anyway.

I then tied the pump lead to ground per your tip and opened the throttles, looked inside all the intakes and nothing seemed to be leaking.

I tried removing the vacumn line from the VST to the intake - no difference in the symptoms.

I took a look at the plugs and most of them looked OK, so I left them out and had my helper crank the motor with throttle open while I looked in the intakes to see if the injectors were spraying. The motor was shaky so I didn't get a great look, but I could swear only the bottom 2 injectors were spraying.
I pulled the injectors, cleaned them all up and sprayed the ends with carb cleaner, swapped the bottom 2 with the top 2, and reinstalled them and the plugs.

The second crank she fired over and ran! Fine music to my ears - I almost cried

So, do you suspect the injectors were just dirty?

I didn't see anything in the injectors that looked suspect. Should I send them out? Or, is it possible I had air in the system?

Also, It may be the case that my gas went bad although I have no evidence of that. Is there a way to test it? I have about 50 gals in a 100 gal tank. But to be safe should I drain the tank?

Anything else you would suggest at this time?

Thanks for your time!

 

[rodbolt]

Re: 2000 200hp ox 66 fuel injected

myself? I would send them off, I use Flagship Marine in Florida, however any injector shop can do it.
you really dont want to find the partially clogged screen cause it leaned out and popped a piston.
the OX66 motors also mix the oil with the fuel in the VST.
but you seem to be on the right track.
I would not worry much about ign timing, its not adjustable anyway and your numbers on the TPS are correct.
if you suspect the fuel has degraded, pump it and run it in your car, 4 strokes tolerate varnished fuel, two strokes dont like it as it tends to build up on the piston skirts and the skirt to wall clearence dissapears just before bad things happen.