Finding the Issue - Sled following scuba lessons

[darens]

My son decided to give our 08 700 complimentary scuba diving lessong in a lake last July on our last ride of the year. It went down in about 12' of water, we had to leave it overnight to get the gear to rescue it including float tubes, building a homemade grapple hook ...

It was in the water about 14 hours, when we got it home we drained the gas, sucked all the oil and remaining gas out replaced it with new gas (mixed to give more oil to the motor), then started it up - it ran but would not idle, we had to hold the throttle open to keep it running and we ran it for about 20 minutes that way to make sure we had motor dried out.

A few days later i went out to start it and it would not start again, i tried different things, starting fluid, checked the plugs, ... it would pop and sputter, especially the first time you pulled it after it sat for a while, but would not run. It has great spark, the fuel pressure comes up (you can let the pressure off through the pressure check valve. I thought maybe some of the components had water in them and needed to dry out, so we kept trying it from time to time over the summer to no avail, it would pop and sputter on the first pull then sound like it fires a little on subsequent pulls, but not enought to get your hopes up.

I just tested and calibrated the TPS tonight, it had no effect, it was a little off, but not way out.

I am looking for suggestions on what i can check next - any and all ideas are welcome.

A few ideas i have:

- could the coils have water in them and cause it to fire good at first and then go weak?
- the motor was running as it went down, what way can i check for engine damage - do cranks twist when you ingest water? Could the motor be out of time?
- Could it be the ECU and have issues with the the water?
- What other things could cause this?
- Any suggestions?


Thanks in advance for your help!!!!

Think Snow

d

 

[AKSNOWRIDER]

get a good multi meter..and start testing..start at the stator and work down the line..most likely you will find stator is damaged..possible a few sensors..and maybe the ecm..I would test everything electrical..wires,switches, sensors, stator,,all of it)alot depends on if it was running when it went in..doubt there is any mechanical issue with the motor since it did run ...shop manual will give you all the test specs for the stator and most all the sensors..ecm I do not know of any good test..but shouldnt be hard to swap with another sled and see if it runs..you should also inspect every connector in the harness for any signs of corosion..there is a product xalled stabilant 22 made just for electronics that have been under water..it really works for connections....good luck

 

[KJAssault]

i would check compression in cylinders and pull exhaust valves to look at piston walls. very possible they are scord if it was running when it when down. possibly cracked a piston or bent a rob when it hydrolocked. sank my sled did the same stuff new gas oil had it running in an hour 2000miles since no issue but it was off before it hit the water. good luck hope you get her going.

 

[crashnbash]

You may find that you have alot of electrical issues, including the switches on handle bars (kill, key, and throttle safety). Don't ignore the fact that the motor went down running, water don't compress like air. You have only seen the motor run at higher rpm with no load on it. I have seen alot of bad motors run high rpm with no load, but only a handful would still idle.

 

[yukonrider]

Try dissconnecting the wires that go to your killswitch. The throttle saftey switch may have somthing to do with the lack of idle

 

[shawkins]

Been there

Did that last year. The sled sat overnight in the lake. The only issue I had was electrical. You need to go through all of the electrical. Disconnect everything you can that will allow the motor to still run and start from there. They will usually run with the TPS, temp sensors, and all the kill switches unpluged as well as the some of the other sensors. Eliminate all that you can. I will say the ECU connectors have to be dry. Even a small amount of water in the connectors will cause problems. Good luck.

 

[darens]

Thanks ALL!!!! I went out the next morning and pulled it over - fired a little longer, so kept pulling on it until it ran longer and longer, turns out i think an injector was sticking open or something - it did it a couple more times that morning, but after getting it going it is running great now.

Thanks

d