CHIF8008

so if you have a snorkel your ok. but what if you ran your exhast up the back side of the jeep?? like the humvees do? then there would be no prob. right??

bishop letov

you dont really have to run the exhaust up but you want to keep water out of the intake.

For the exhaust the worst thing you could do is allow the motor to stop running. As long as you have exhaust pushing the water out of the pipes then you good. Stop the motor and then the water has a free path.

bishop letov

just to make it clear. Water in the intake = VErry BAAADdd!
with a snorkel that runs to the roof you could technically run through water up to the dash. That without even mentioning the electronics or fuel tank.. watch this vid

CHIF8008

haha iv seen that one
before haha

4.3L XJ

OK back to this guys problem. It ran fine for a couple of days, then nothing. So we can assume there are no bent rods (did that once with too much gas down the intake), the valve train is good and the oil should be reasonably clean.

It is time to do a little trouble shooting. Does it have spark? Does it have fuel pressure?

The O2 sensor was suggested. I agree it would be a good idea to change it since the tail pipe was probably under water and engine not running. However, an engine will start briefly with out the O2 sensor working to give it a chance to warm up and be working properly.

Has he checked for codes? Haven't heard those words yet.

But if I was going to hazard a guess at this point, I would go for the crank position sensor. I have heard they don't like water, though I don't know that for a fact.

Anyway, do some basic trouble shooting and then get back to us.

bishop letov

just Let me say this..... Unless you are experienced at deep water crossing and have prepped your rig for that kind of extreme submersion I DO NOT recommend trying that.

You have to consider your ignition system, Fuel, Any breathers or passages in the engine bay, Your Trans, Your axles.. Etc....

If you do that you do it at your own descretion and of your own accord....

BTW.. If you are crazy enough to attempt that then be sure to take video and pics of what a xj fish tank looks like.....

Mike1998XJ

I didn't hear that he changed the diff fluids, tranny fluids, gas tank and so on. For all we know at this point the gas tank may be full of water???
Let's see what he says.
Mike

Vaultzz

Wow, thats a lot of replys.

I don't know many of the technical terms about the engine so I'm going to make a short video tomorrow morning with my iPhone. I'll be able to show you exactly where the water went up to, what its doing now, what little sensors my uncle told me to check and other stuff of that sort.

Its 10:00pm here now, I'll probably have the video up by at least noon tomorrow.

Thank you all so much for your input, and I hope the video will clear some things up

Vaultzz

Ok, I've got the videos uploaded and here they are:

pt1: (after 2:30 its just me trying to start the engine. Its already running in pt 2)

pt2:
pt3:
I havn't checked for any codes yet, I've got to find a place that'll do it for free. I'm pretty good with electronics but all of those sensors and things are foreign to me.

Also, I ran 2 bottles of fuel injector cleaner through the tank over the past week. Currently I'm using about twice the amount of gas that I usually do just to get to work.

Thanks everybody!

Jamie57

Plugged cataylitic converter!
Can you drop the exhaust before the cat and take it for a spin?
Yes it will be loud but the performance will be light years different if the cats plugged.
There also seems to be an air restriction of some sort if it idles faster if you let more air into the intake. Did you take off the airtube from the filter box to the throttle body? Is it very clean?
And you may have pouched some of the sensors that tell the computer how much fuel to let pass through the injectors.
How does it sound at WOT (Wide Open Throttle)?
I think it's getting too much fuel.
Just some random thoughts from an ex tune up mechanic.

Mike1998XJ

Was that Video on Youtube of "Jimmy Hydrolocked" the actual footage of the event that caused this?
Mike

XJ?2010

TPS! Throttle postion Sensor mine has gone out twice when i have sucked water up. When your driving and you let off the gas the RPMs will drop to about 200 and it will feel like the motor is gonna quit on ya. Also if you hold it open at wide open throttle it will bog down and get confused and will not act right.

You may have other issues as well but im confident that it has gone out and that would cause the check engine light to come on as well.

Also the TPS is located on the throttle body in line with the throttle plate on the back side. and should cost about 40 bucks from the auto parts store.

muddeprived

Go to autozone. They do it for free. I bought my own code reader from harbor freight. It's only $50 and already paid for itself.

You should read my upcoming custom-snorkel write-up and maybe do that.

4.3L XJ

I will agree with Mud. Get the codes. However I will stick with my original opinion that the o2 sensor needs to be changed, and possibly the TPS

Mike1998XJ

If the Jimmy Hydrolocked video is indeed the footage of him having this problem, I would think it's one of the mentioned sensors that went out. He really didn't hit the water hard nor was ith very deep. It looks like just a little indirect spray would have gone into his intake. I wonder how much water intrusion it looked like he had into the airbox when he took a look? From the video I can't imagine it was very much. Although any water that ultimately gets into the intake and cylinders is not good.
I wonder how much if any water he saw on his first oil drain? Couldn't have been much...
I think that leads us back to what everyone has said "go have the codes read"
Let's let the computer help us on this analysis.