Here's the situation -

1999 F350 with the 7.3 PSD, crew cab, auto, 4X4.

The truck runs fine in good weather, but if it's raining or snowing, it will suddenly die - and by that I mean lose all power as though you turned off the key. There's no warning. It lasts for a period of time, and then the truck will restart - most of the time.

It's seems like it should be a pretty simple/obvious electrical problem, but I've had the truck in to two of the best diesel shops in town, and neither has been able to locate the problem, in spite of countless hours and some pretty big bills being racked up.

Any help you guys out there can give me would be MUCH appreciated.

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I know it has nothing to do with the weather issue but, have you changed the CPS?

 

The first thing that comes to mind on anything like that is the CPS(camshaft position Sensor). The other thing would be to look and inspect the PCM on the drivers side to see if water is entering somewhere. There's some hardcore PowerStroke guys on this website that I'm sure will chime in with some better info. Sit tight.

 

Yes, the CPS has been changed. I'll take a look at the PCM tonight.

Thanks guys, keep it coming...

 

A leaky windshield is a common issue and tend to head straight for the pcm... Also is this when its wet out? OR is it when you are using windshield wipers. I remember an issue someone had where it was a wire shorting out when he had the windshield wipers on but he assumed it was a water issue...

 

Some of the 99's had issues with water leaking from the drivers side windshield and causing problems with the GEM, Fusebox and from time to time the PCM. The IDM is under the inner drivers side fender well and could be getting wet as well. As Nolan had said there are some CPS that come from the chain stores that when the windshield wipers are on they some how interfere with the signal from the CPS causing the engine to die out

 

Ford of aftermarket CPS? Is it the rain / snow, or the fact you're using your wipers that causes the stall?

 

Aftermarket CPS.

The wiper thing never occurred to me, I'll check on that today.

Thanks a million for the help guys.

 

There have been reports of some aftermarket CPS signals getting interfered with by the windshield wipers. Stop by Ford and get you a new CPS for $25. Better yet, get two so you have a spare.

 

Valve cover gasket issues too with the harness. My buddy ran into this problem.

 

i had a problem with the leaky windshield... when i would rain my carpet would get damp by the drivers side door. i just thought my door molding was bad. but it was my window. caused all sorts of problems.

 

My .02...when my windsheild leaked my crusie, abs, airbag, fan, wipers, and probably other stuff that i dont remember went crazy. And my new windsheild fixed it all within 2 days.
But yes the wiper wiring short, cps, and valve cover are all other good options to check!

 

Thanks for all the help everyone.

It hasn't acted up lately, no rain here lately though!

I'm still working on the problem, nothing real obvious so far, but I'm double checking everything. I've got old wiring from a 5th wheel hitch that the previous owner installed too, I think that deserves another look while I'm at it.

I'll report back if I find the problem.

 

Mine was CPS, after a few minutes in the rain when i turned on the wipers AND stepped on the brakes, it would die but would start right up afterwards. CPS was only two months old. bought it at napa and it was a BLACK one.

 

my bet is that it is your wiper motor. When the draw too much current, the ground cant keep up and your computer goes haywire causing the truck to buck while driving or stall while at a stop. Mine did it when the wiper position was in the intermittent mode just one setting shy of on all of the time. I isolated the wiper motor ground, ran it directly to the battery and the problem was fixed. In the end, the motor probably needs replacing. Seems like a water or snow thing, but in reality, you don't realize you have turned your wipers on and the motor is the culprit.