Posted for Karljs1

[boscoe99]

System is not letting him post. Maybe his bills have not been paid.

Quote
I have 2003 200HP OX66 VMAX EFI VX200TLRB that is stalling and then does not want start for a while.

It starts at the ramp every time. Idles out of the marina and will run at speed. After I stop for a while, it will usually restart then shut off after a minute or two, still at an idle. At this point it usually won't start. The starter engages it just won't fire. It can take anywhere from 5 to 45+ before it will fire again. To confuse matters, it will sometimes shut down at speed. When it does this, most of the time it refires immediately, sometimes not.

• I tested the red and blue wires on the VST when it is running fine12-13v on the Red.
• On the blue wire, less than .5 for 3 seconds then 12v. Once the engine fires I get a constant .26 at idle, .3+ at higher RPMs.As of yet I have not been able to get readings at failure yet. I will try again this Sat.
• I tested the HP Fuel Pump resistor. It seemed to be in spec. I did get minor fluctuation but that could be rounding, meter, or how well I held the leads. I am going to find an analog tester and retest.

1. I cleaned and checked the VST tank and filter
2. Changed the filter on external canister
3. I have replaced the low pressure fuel pumps
4. Cleaned the 02 sensor
5. I tested fuel pressure above the VST and it is a steady 35 pounds
6. Don't remember if I changed spark plugs or not. But I think I have, anyway I will have someone more knowledgeable than me take a look at them

Besides testing the red and blue wires at failure, what other things can I do look for.

Could it be the kill switch or ignition switch cutting out? Spark plugs, main relay, fuel injectors, etc?

Thanks in advance.

End quote

[99yam40]

hard to believe bosco posted for him but did not offer and advice on it.

I would monitor fuel pressures and spark when the problem shows up

[Karljs1]

He has given advice which I am acting upon.

Thanks Boscoe for posting for me!

[boscoe99]

hard to believe bosco posted for him but did not offer and advice on it.

I would monitor fuel pressures and spark when the problem shows up

Boscoe be working behind the scenes.

[99yam40]

OK it is the secret advice that can never be read,

if you do get to read it your eyes fall out

[boscoe99]

OK it is the secret advice that can never be read,

if you do get to read it your eyes fall out

OP could not post his message. He sent me a PM. I asked him to send me an email address so that I could offer him some diagrams and things to think about.

I then posted his message so that others could respond to his queries as well.

If you want to see my email give me your address.

[99yam40]

just messing with you
a little bored today

[boscoe99]

just messing with you
a little bored today

I knew what you were up to.

I have been in and out all day doing yard work. The pollen here in Georgia is awful. Got some Texas rain on the way to flush it out. I hope.

[99yam40]

Had surgery to remove a piece of metal in my right index finger Thursday, so trying not to mess up stitches so staying inside.
We did not get much rain out of that front that blew threw last night.
but heard about some hail up above us in central Tx

Yea oak, pine, and ceder pollen have been very bad around here

[pstephens46]

Had surgery to remove a piece of metal in my right index finger Thursday, so trying not to mess up stitches so staying inside.
We did not get much rain out of that front that blew threw last night.
but heard about some hail up above us in central Tx

Yea oak, pine, and ceder pollen have been very bad around here

Guessing something to do with clearing the land? Can't believe no one else has asked!

[rodbolt17]

sounds like some splatter gunning.
do not make me break out the 500 bucks in quarters and a bucket.

if you suspect the stop circuit.
pull the stop lanyard and crank the motor, you should get an alarm.
if you do the stop circuit is working as is the alarm.
if you do not then fix the alarm/stop switch. first.
you need to measure the rail pressure at the failure point or it is a worthless test.

the O2 sensor cannot shut off the motor nor make it not start.

bad lift pumps can let the VST run out of fuel.

the resistor is not used above about 1200 RPM.

that engine ign system uses two charge coils,one for each bank and six pulser coils.
the pulsers share a common ground.
but at the failure you gotta figure out did I lose spark or fuel.

[99yam40]

Guessing something to do with clearing the land? Can't believe no one else has asked!

No it was back in the 70s when I got a piece of chisel or bearing in my finger from a guy in the shop stall next to me ,
I was minding my own business cleaning and putting away my tools in my stall and the guy one stall over was beating a bearing off a shaft.
they would not remove it back then saying they might kill the nerve in that finger, so I lived with it with no problems for over 40 years.

Need to get a MRI and they said no metal in me, so out it comes

[pstephens46]

No it was back in the 70s when I got a piece of chisel or bearing in my finger from a guy in the shop stall next to me ,
I was minding my own business cleaning and putting away my tools in my stall and the guy one stall over was beating a bearing off a shaft.
they would not remove it back then saying they might kill the nerve in that finger, so I lived with it with no problems for over 40 years.

Need to get a MRI and they said no metal in me, so out it comes

Not too bad, I guess.

Makes you wonder what would have happened if they had switched on the MRI with the metal still there?

[99yam40]

they told me it could travel and do damage.
as hard as it was for the Dr to remove it, I do not think it would have traveled anywhere.
pic of what they removed and the metal I cut out of the inside

[Karljs1]

Tested plugs for spark all good. Took her out today and could only get it to fail once. When it did it lost 12v to the fuel pump. Tried to restart and no volts, then it restarted. It was cooler today than it has been. Which might have had something that do with why I had trouble getting it to fail. For some reason I think heat plays a part. Ran at all kinds of RPMs, ran it over some choppy water and could not get it to fail. Did not get a chance to spay gas into the air inlet.