I have a 1999 f350 V10 dually long bed regular cab with only 66,000 miles on it. I washed the engine and drove it home and it ran rough, it was missing pretty bad for awhile on the way home and now it wont even stay running. What should I look into first? Thank You for your input!

 

Blow the water out from around the plugs. You may need to pull the coil packs off the top.

 

The truck has been siting for about 7 days now should it be dry by now? forgot to post that part about it sitting for couple days.

 

I hope you didn't use a pressure washer like in a car wash. That's a no-no with modern engines. A leaf blower or compressed air might help and if you get it running let it run for quite a while and hopefully the heat from the motor will help dry any residual water.

 

If it got wet under the coil packs it could stay wet for a long time.

 

First, pull the coil packs, and check for water in the plug holes. Helps to know which cylinder is misfiring.
I have seen this several times.

Dirty engine = happy engine.

 

No problem, I mud bog with my 5.4 and power wash it after each time. The plugs are sitting down in a hole about four inches deep and one around. The coil pack on top of each plug has a rubber part that reaches down into the hole and attachs to the plug. It is made with a seal that tries to keep water out but it ain't perfect. Unplug the wire harness from the coils, remove the screw holding the coil pack in place, pull pack straight up until it comes out, blow compressed air into the hole to blow the mud and water out, cover your eyes when doing so, spray some cleaner down the hole and repeat blow, WD40 would work in a crunch just make sure to blow it out good, leave open to air dry for a while, then reinstall. Do not remove the plugs. The water will not just go away in time you got to get it out. This should solve your problem. Easy!

Almost forgot, every darn wire, screw, hole, coil is a pain to get to easily and some impossible to see. First times a pain, but you get use to it. As mentioned, if you can read the codes and determine with plugs are fowled you only got to do them.

 

The thing you have to be careful about is by powerwashing you TAKE A CHANCE of shorting out some of the coilpacks. I made that mistake once, let the motor stay dirty after that.

 

also did you get in any water to the air cleaner, i would think not but worth looking at it just to make sure. I would tend to think as everyone else is that there is a issue with COP.

 

If you want to wash a COP-equipped engine, spray it with a regular-pressure hose (not power washer) and then pull every COP, blow out the spark plug holes, and apply dielectric grease to the boots, at the tip where it meets the spark plug, where it seals to the coil, and also around the seal area where it seals to the head.

 

A dirty Triton engine is a good thing.

 

dont forget too water in the alternators can short them out too.. waters a great conductor and can let the electricity the alternators making jump to its more sensitive components inside.. resulting in shorting them out... you can hear it arcing inside when water gets in there...

 

I guess I won't be driving through any rainstorms then. Ever look under the hood after a good soaking rain driving at 70MPH?

Dirt SUCKS - I hate working on a dirty engine. Like I said, if you want to wash it, just make sure you pull the COPs and use dialectric grease on everything, ESPECIALLY the seal where the boot seals to the head, and then a GENTLE washing won't hurt anything.

Matter of fact, I use dialectric grease around all the connectors whenever I take anything apart. Keeps water out of every connector I have.

 

My 2000 V10 developed the problem of running rough everytime it was in a hard blowing rain. I did basically what Art described above with the dielectric grease. No problems since and that was three years ago.

 

yes i have and its not as bad as if someone sprayed it with a hose either... theyre built to take a bit of water getting in them... but not a bunch like when your spray em with hoses... theres a big difference there...