Long story and havent been on the forum in awhile but i got stuck in a ditch with my 2013. Ass end/ muffler, were submerged. I sucked up h20 through the exhaust. Guessing it happened when i ran out of fuel, stalled and refueled/ restarted. For some reason i drew water all the way to the intake manifold. Drained everything, vaccummed up the water, and put the 3.6 back together. I can get it to stay running with a near constant spray of ether. Gonna replace plugs and really dry her out and see what happens. Figured id warn the forum because this phenom. was news to me. Any advice or would be appreciated. And i can answer questions to keep you guys dry. Ill do a full write up weather i can warranty anything (longggggg shot), fix it, or V8 swap.

 

youre lucky I did that with a 99 frontier when I was in highschool and ruined the engine after we tried to pull start it, an engine that had less than 5,000 miles on it, my dad was less than impressed.

 

Yea man. Hopefully i can get it going.

 

You probably thought of this but just to throw it out there..
replace your o2 sensors. They will fail when contaminated with water.....ask me how I know

 

Ok, can someone explain to me how this could happen? It seems like the exhaust valves would be closed on both the intake stroke and the combustion stroke, so the engine shouldn't be sucking anything back up from the exhaust. It seems like the water would have to come in from the intake. I understand (I think) that there's some valve overlap there but I still can't imagine how it would be enough to suck water all the way from the tailpipe.

Note: Don't take this as me saying it didn't happen. I'm not saying that at all. I'm just wanting to understand how it could happen.

 

The exhaust back pressure will cause little moments of vacuum.... Try this... Hold a piece of paper to your tailpipe at idle. You will notice that at times it is pulled tight against the tip. Holding a high idle should prevent this, as the increased exhaust overpowers the moments of suction.

The issue the OP is talking about is worsened on rigs that have removed their mufflers and are only running a resonator.

 

Yes water can be sucked back all the way into the engine if conditions are right. It's a combination of the exhaust, header, and engine itself that as they all cool, can suck the water right through the exhaust and into the engine through open or partially open exhaust valves. Cold air is denser and takes up less volume than warm air... so as it cools, it can create quite a suction if it's in a confined area.

 

the valves are never fully closed on the upward side of a compression stoke aka creating a vacuum, also what draws fuel in to the cylinders from the intake valve... Never hear of it to this extreme but yes IT IS POSSBILE... Hopefully your lucks..

Chris

 

Not to be a jerk but I hate hearing people use ether on these new model vehicles gas or diesel. If it doesn't run on it's own something is wrong plain and simple. It's the best way to ruin a motor. And just like everyone else said yes it suck water up threw the exhaust why would the old redneck 4wheelers have 5ft exhaust stick up behind it.

 

long as it is running you should be find but if it shuts off you dont want to start it up again unless its out of the water cause thats usually where the damage is done