Unexpected Deep Puddle = Engine Misfire

BeepBeepJeepJeep · **Posted:** Sun Dec 30, 2007 11:45 pm

So me and my step brother went wheeling today, and came across some "puddles". He went through it fine so I went through it a little faster than I should have and nearly stalled the truck (from the lack of a torque converter [1st gear 4hi], not because water was getting sucked in).

A few minutes later the truck started misfiring, and it slowly got worse. The engine won't go over 2500rpm without dying and the thing idles like a 454 with a race cam.

What are the chances that once everything dries out, the truck will run fine again? If not, what do you think I will need to replace? Wires?

Thanks,
Bill

myjeepwalks · **Posted:** Sun Dec 30, 2007 11:54 pm

3.7's dont have wires it has coil over plug set up. how deep was this puddle?

BeepBeepJeepJeep · **Posted:** Sun Dec 30, 2007 11:56 pm

myjeepwalks wrote:

3.7 dont have wires it has coil over plug set up. how deep was this puddle?

Not quite as deep as the deepest puddle I've ever gone through (at slower speeds), but water did splash on to the hood... as far as the exact depth I have no idea. I did check the air filter and it was dry...

myjeepwalks · **Posted:** Sun Dec 30, 2007 11:57 pm

if it's got a misfire that bad the check eng light has to be on. pull the codes and start from there.

BeepBeepJeepJeep · **Posted:** Sun Dec 30, 2007 11:58 pm

myjeepwalks wrote:

if it's got a misfire that bad the check eng light has to be on. pull the codes and start from there.

I will do that tomorrow I guess... The cel was blinking at first for about 20 mins but now it's on solid...

tommudd · **Posted:** Mon Dec 31, 2007 12:08 am

yes pull the code and then you know what you are dealing with, until then we can only guess what it may of done.

Tom

Guest · **Posted:** Mon Dec 31, 2007 1:07 am

Could be a cracked coil pack housing that got wet. find out which cylinder is misfiring if the problem persists, and replace said coil. Check codes, regardless of whether or not you have a CEL.

GeekyJeep · **Posted:** Mon Dec 31, 2007 1:11 am

many years ago a friend of mine was doing something similar with his wrangler. We discovered that the Throttle Position Sensor had fried. if the plugs are ok check that.

BeepBeepJeepJeep · **Posted:** Mon Dec 31, 2007 1:23 am

GeekyJeep wrote:

many years ago a friend of mine was doing something similar with his wrangler. We discovered that the Throttle Position Sensor had fried. if the plugs are ok check that.

Thank you very much for that info

BeepBeepJeepJeep · **Posted:** Mon Dec 31, 2007 1:09 pm

P0300 Random/Multiple Cylinder Misfire Detected
P0302 Cylinder #2 Misfire Detected

There's another one but I can't figure out how to use my step father's pda to get it out... Program says "use up/down buttons to scroll" but there are no frickin' up/down buttons!

Haha, well anyway... This should get me started.

Jeepjeepster · **Posted:** Mon Dec 31, 2007 1:26 pm

Switch the coils and see if the code moves. Check the plug on that coil to make sure its clean and dry. Take the coil off and make sure not water is sitting down around th spark plugs. The seals on the coil make be bad.

If you take the plugs out, be sure to use compressed air to blow all the sand and grit out from around the plugs.

I detailed my engine once and the engine temp sensor got wet. I let it dry for a day or two and it was fine.

BeepBeepJeepJeep · **Posted:** Mon Dec 31, 2007 1:55 pm

Jeepjeepster wrote:

Switch the coils and see if the code moves. Check the plug on that coil to make sure its clean and dry. Take the coil off and make sure not water is sitting down around th spark plugs. The seals on the coil make be bad.

If you take the plugs out, be sure to use compressed air to blow all the sand and grit out from around the plugs.

I detailed my engine once and the engine temp sensor got wet. I let it dry for a day or two and it was fine.

I pulled the cylinder2 coil and there was water down there. I am letting it run (it's already running 100x smoother) to see if there's another cylinder misfiring. How much would new coils cost? I'd like to get ones that seal

Thanks,
Bill

myjeepwalks · **Posted:** Mon Dec 31, 2007 6:32 pm

BeepBeepJeepJeep wrote:

Jeepjeepster wrote:

Switch the coils and see if the code moves. Check the plug on that coil to make sure its clean and dry. Take the coil off and make sure not water is sitting down around th spark plugs. The seals on the coil make be bad.

If you take the plugs out, be sure to use compressed air to blow all the sand and grit out from around the plugs.

I detailed my engine once and the engine temp sensor got wet. I let it dry for a day or two and it was fine.

I pulled the cylinder2 coil and there was water down there. I am letting it run (it's already running 100x smoother) to see if there's another cylinder misfiring. How much would new coils cost? I'd like to get ones that seal

Thanks,
Bill

think coils are like $40ea. - blow all that water out with an air hose, blow coil out and put back together. if you're lucky the coil didn't short out. if it still misses put a new spark plug and coil in cyl #2.

Jeep4me99 · **Posted:** Tue Jan 01, 2008 6:08 pm

same thing happened to me about a year ago after going through some deep stuff. i had like a billion codes and the jeep felt like it was going to fall apart. Ended up being a coil pack. I also changed the spark plugs since at like 55k they were still the originals.

501 · **Posted:** Tue Jan 01, 2008 6:48 pm

BeepBeepJeepJeep wrote:

P0300 Random/Multiple Cylinder Misfire Detected
P0302 Cylinder #2 Misfire Detected

There's another one but I can't figure out how to use my step father's pda to get it out... Program says "use up/down buttons to scroll" but there are no frickin' up/down buttons!

Haha, well anyway... This should get me started.

There should be a big button in the middle of the bottom section of the pda. Push on the upper part of the button for up and the lower part for down. At least thats how the two pda's I have work.

homeslice8u · **Joined:** Thu Nov 29, 2007 10:49 am **Posts:** 49

i went through so big puddles and water wet everywhere it was so crazy that water got inside some how. but ne ways mine runs fine and it hasent had any porb. since the crazy run.

dinger8779 · **Joined:** Tue Aug 16, 2011 10:31 am **Posts:** 1

I got a 2002 jeep liberty sport. Throwing a misfire code P302. Changed out all the plugs and the coil pack for cyl #2. Jeep still running rough and dies when put in gear. Help me please. Need to know what I should look @ next or what would cause this. Hit a puddle on Saturday. Jeep ran fine sunday and monday morning. Then everything went down hill. Well just changed the TPS sensor and still no change. Still running rough @ idle and driving. Haven't thrown the code again yet.

Unexpected Deep Puddle = Engine Misfire

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