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post #1 of (permalink) Old 10-16-2002, 02:49 AM
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i was wondering a problem. I sunk my tj a while back and noticed while it was in the water (not totaly submergered) that it would not crank back up. now i know that if the intake on the engine was under that it wouldn't start, which i was sure that it wasn't, i was wondering if it was b/c my tail pipe was under and it wouldn't crank or if it was just b/c i might have gotten some water in the intake??? I've heard (if i'm correct) that the tail pipe also sucks in air while the engine was running....???correction??? and if that had any thing to do with it??? My jt is a four banger w/ a 4" superlift (cheapo/had no money) w/ 33" tires. Any info would be greatly appreciated. Thanks
P.S. If i ran into a situation like this again would a snorkel be a waste of money??? If any what other mods would be appropriate????
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post #2 of (permalink) Old 10-16-2002, 04:30 AM
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Re: water?????

It sounds as if you are back to driving your TJ, so you would have know if your engine was hydro-locked (filled with water). In this case, you could have bent rods, etc if you would have "cranked it up". If it's running now, sounds as if you just got the ignition wet, which would prevent the engine from starting.

A snorkel would not prevent a wet ignition, but it does allow the engine to breath air vs. water during a water crossing.
post #3 of (permalink) Old 10-16-2002, 09:36 AM
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Re: water?????

Sounds like you got your ignition system wet. The electronics getting wet are just as much of a problem as the intake being under water. I don't think that your tail pipe being submerged had anything to do with it.

By the way, did you check your differentials, transmission and transfer case for water? It has nothing to do with the engine running, but you can ruin your drive train pretty quickly if you got water in there and didn't change the fluids after.
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post #4 of (permalink) Old 10-16-2002, 09:48 AM
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Re: water?????

I would agree that it was most likely your ignition system that was wet.

To asnwer you question about the tailpipe, It is possible to suck water in through the exhaust. It happened to my buddy who swamped his 4x4 and we know for a fact that the water was only a little higher than oil pan level. When we finally got it out of the water hole it was full of dirt and mud from cranking it over.

I personally run a exhaust snorkel while doing that type of wheeling. it also allows the jeep to breath better. I have it sealed pretty good and my exhaust is completely welded all the way up to the collectors. That way no water can get in.
post #5 of (permalink) Old 10-16-2002, 11:06 AM
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Re: water?????

But I've also seen on a dodge with a K&N.. it was sucking air from the top 1/8 of the filter.. and holding water back everywhere else..

it needed a little throttle to keep the engine running under water like that, butwhen the driver got out and his friend tried to take the drivers seat.. it stalled..

obviously the water didn't come in the filter..
we decided the water came up the tail pipe, and in through the exhaust valves because there was a significant ammount of water in the cylinders.

oh.. and we guessed that another reason for such a sudden intake of water was that the cold water contacting the very hot exhaust gas would cause said gas to contract and create a vaccume effect sucking the water right in and up.
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post #6 of (permalink) Old 10-16-2002, 11:26 AM
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Re: water?????

One thing I've heard, and it may of been mentioned already, but don't try and start your Jeep if it dies and the tailpipe is underwater. Once there's no gas pushing out the tailpipe, it'll suck water up and cause all sorts of hell.
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