FCV fails open

[tor*p*do]

What happens if a FCV fails in the open position?
It feels like my exhaust is flooded and will not allow motor to rev up.
Could this be a bad fcv or is it something else.
Revs up fine out of the water.

 

[OCD Solutions]

I can pull the guts out of mine and run it straight through with no restriction and all it does is kill a bit of bottom and run quieter.

That being said, do you have a bypass and pisser T'd off the stinger line before the FCV? You could get more water flow than I do depending on how your water lines are run.

 

[DAG]

Better to fail open than to fail close. Like you are saying, it will dump a ton of water in the waterbox and bog if you are riding around at low rev’s and then pin the throttle open. If you ride full speed a lot you probably won’t notice a huge difference. The exhaust pressure at high revs will be pushing out most of the water that’s in your waterbox that low rev’s won’t be able to push out.


I like to strap the ski on the trailer and unhook the line after the FCV and see how much water is coming out at different revs levels.

 

[BruceSki]

Open it up and see if it's packed with crap. Happens when you ride in the marsh or close to the beach. I've seen them packed full of sand.

 

[jo5hi3]

What happens if a FCV fails in the open position?
It feels like my exhaust is flooded and will not allow motor to rev up.
Could this be a bad fcv or is it something else.
Revs up fine out of the water.

I remember having the same issue quite a few years ago. Turned out to be a bad cdi, would rev fine out of the water but had nothing in the water.

 

[tor*p*do]

I have a pisser T'ed off before the fcv.
I blew out my dual cooling fitting and overheated the pipe, melted the cooling line.
Took out the fcv and tried to run it and motor wouldn't rev up.
Going to put it back in and try again.
Motor compression still fine.

 

[tor*p*do]

Put back in fcv and back to running fine.
In my case, no fcv flooded the waterbox and exhaust
and wouldn't let the motor rev up

 

[tor*p*do]

did it again yesterday and flooded my waterbox.
would not rev up until I cleared it out
might be time for a new one

 

[BruceSki]

I think you have something else going on. People run b pipes with no flow controls and don't have this issue.

 

[Fro Diesel]

Are you sure your cdi or coil isn't bad?

 

[BruceSki]

I would start with fresh plugs and cut back coil wires. Then go further.

 

[tor*p*do]

It is really intermittent
if I stop and sir a couple minutes
it will start and not Rev up until I blow out the waterbox.
then it runs fine.
fcv is almost 10 years old, maybe spring going bad?

 

[tor*p*do]

Changed plugs, MSD boots are jss tight. Compression fine. Checked everything else I can think of

 

[tor*p*do]

Stripped and cleaned carb. New diaphragm.

 

[BruceSki]

I'd ohm out stator. Or swap cdi next. Sounds like an issue with heat soaked 20 year old electronics.

 

[tor*p*do]

Running an MSD cdi, but I have a stock 61x I can try.
jss stator as well. Will search testing it

 

[BruceSki]

I'd check stator. Never seen an MSD act like that. They work or they don't. But a weak stator will work fine with stock cdi and not work with an MSD.

 

[BruceSki]

Did you make sure you don't have a head oring or gasket leaking

 

[kx454]

I don't think it is the FCV. When i was trying to shut my front exhaust up I added 2 additional fittings to the waterbox and pipe all outgoing water in....It never made the ski not rev up.