greenvilleXJ89

Okay went wheeling today and I attempted a mud hole I went in and it got stuck. Water came to top of fender and it sat for 20 minutes before getting pulled out. My snorkel kept water out so no hydro lock we pulled the plugs to make sure of that. Cleaned out distributor and took air hose to relays fuse box and anything else electrical. Jeep will sometimes crank and run but revs at 2200 rpm it will sputter some and act like its about to shut off then RPMs will jump back up off and on a few times then will just cut off completly. I know the sitting for to long caused this I had water up to my knees almost inside the cab. Any ideas suggestions to why it won't run correctly and stay running? Thanks for the help.

123456bmx

Wow,water up to your knee's is not good.

The ecu probbably got submerged,remove it from under the dash and open it to check for shorts

tjwalker

The "throttle position sensor" HATES water. If they get even a little bit wet, they can act up.

Also remove connectors to the 5 volt sensors, spray them with electrical contact cleaner, add a small dab of dielectric grease and reconnect.

agrasso5567

Was the engine off when you were sitting for 20 minutes?
water can still get up in the exhaust

Change all your fluids if you haven't already

KG8893

This. Even if it isn't hydrolocked if you have an oil leak (which since you drive an XJ you probably do) then it could be filled with water.

greenvilleXJ89

Yes the engine was off. I unbolted exhaust because mud and sand clogged my muffler. I also took tps sensor off to make sure it was dry. The ECU barely Touched water it was high enough to clear maybe 95% of the water however that 5% might be the devil..

greenvilleXJ89

Where are the 5 volt sensors located?

KG8893

A bad idle air control valve can cause similar symptoms to what you have. My buddy drove through a big mud puddle and his blew out.

Parsnip

Cps. Trust me on this one...they HATE mud. Mine got covered in it one time and the jeep died on me, sprayed off the Co's and she came.right back to life

greenvilleXJ89

That's funny you said that I just pulled mine off it was tricky to get to but the sensor part that goes in the housing by the Trans is dirty and has sand in it and mud dried up on the little tip of it so I'm gonna clean that off and put it back on and see what happens.

greenvilleXJ89

Is the idle air valve one of the sensors that goes in the throttle body?

Parsnip

Yes, its on the back of the tb iirc

greenvilleXJ89

Now the jeep is not getting spark. I cleaned the CPS sensor and no luck. It tries to turnover but will not fire. Yesterday it would fire and run like I stated in first post and now nothing at all...

nickxj94

I would let it dry out for about 3 days and try it, I sunk mine in a creek it wouldn't start for 3 days lol

greenvilleXJ89

That's my plan now it's sittin in the garage with the doors open (battery is disconnected) and a big fan blowing on it. If not then its headed to the shop.