2 weeks ago, I went to the car wash and washed my 04', the motor has always been pretty much spotless, but there was a little dust on it, so I decided to "hose it off" - no direct high pressure was focused anyplace, just a light "wisk" over the motor and shut the hood... after I finished washing the truck, I jumped in and tried to start it..... this is where it all begins...

it cranks over and fires, then dies.. and the "Failsafe" pops up in the display....

I towed it home and thought it would be an easy fix with a little WD40 and my code reader - not the case...

I pulled the codes and have the following -
P0121
P0193
P0221
P1000
P2104
P2111
P2135

It will not allow me to clear them and the TB open and closes several times when the ignition is turned on, as well as the "Low Oil Pressure" on the display...

The truck is an '04, with the 5.4L and has 122k miles on it.. no issues before it crapped out at the car wash, just died and will not start back up...

Before I buy a new ECM, I thought I would see if anyone had any suggestions....

Thanks

 

i had a check engine light on and got it checked and it was a bad ECM and i put it off for a week and it just went off one day went to have it checked again and there was nothing so im thinking maybe a glitch, idk just my experiance

 

I wish I knew what it was, but I can't see how it could be your computer. I'm assuming you didn't drench it. Seems like what ever got wet should just dry out and be fine again since it died on the spot. I'll bet it will be something easy. Keep us posted and good luck.

 

Try to dry out every electrical component under the hood. Use compressed air.

Good luck.

 

X2. Under no circumstances should you ever put water on the engine to clean it under any pressure, even garden hose pressure! There's way too many electrical sensors and connections, and no doubt you got several wet.

Too late for you now, but you can try the compressed air method to dry out the engine. Also open the hood on the next sunny day in hopes that will help dry everything out.

 

Its been 2 weeks since this happened - I have either WD40'd or compressed air every single plug... nothing.. no change from the first day..

Its not like I submerged it in water... I mean, it probably has gotten more wet from driving in the rain... No to mention, this is not the first time I have hosed it off... just this time, it wont run...

 

You have had to have directly sprayed something hard... Or broke a connection somewhere.. You should be able to drive this truck in pouring rain with no hood...

 

Have you disconnected the battery and let it set for like 30 mins.. And then reconnected and tried to start up?

 

It's possible I suppose that some water got into a connector, such as one of the three that connect to the PCM (passenger side firewall) and shorted out a circuit or component(s).

You may end up towing the truck to a Ford dealer to figure it out. They have the expensive diagnostic tools to isolate the problem. In looking at my factory repair manuals, there are extensive flow chart type tests that get performed, and some of these tests/diagnostics require special devices to measure readings at a test point, connector, or sensor. Stuff the average home mechanic does not have access to.

 

did you ever try disconnecting the battery?