Stumbles when it rains??

[owtcast]

My little brother has an 03 CC 4wd with a 7.3. He says he can't figure out what is causing his truck to stumble every time it rains. He says it will be running perfect then, for like one revolution of the crank, it completely dies, then picks back up. If it's idling when it happens, it will completely die and have to be re-started. Occaisionally he gets a check engine light but it will clear after restarting. He doesn't have a way to check codes. He's going through some sort of training before taking off to Iraq so he's tight on time. I'm thinking his only option is dropping it off at a dealership to be looked at unless he can find someone that read the codes for him.

[Marty]

Where is he located? There maybe someone nearby that can read the codes.

Maybe a CPS in this situation?
Lets hope that's all it is!

[owtcast]

Originally Posted by Maintain

Where is he located? There maybe someone nearby that can read the codes.

Maybe a CPS in this situation?
Lets hope that's all it is!

That's what I thought too but, he changed it and it still does it. And only when it rains!!??:rain:

Oh, and he is in south Texas right now so it's always raining.

[vitalidle]

I thought I read somwhere that the IDM can cause problems if it gets wet? I might be off base here. Best thing is get the truck scanned

[pipelayerjdh]

May want to try cleaning the CPS plug.

That's wierd though, mine runs better in the rain

[owtcast]

Originally Posted by pipelayerjdh

May want to try cleaning the CPS plug.

That's wierd though, mine runs better in the rain

Yeah, I'm going to tell him to disconnect it and inspect for corrosion and a good connection.

[owtcast]

[Mike99F250]

Your brother's sounds excactly like my problem. Codes, stalling etc. I think you will find that it is not the rain it is when the wipers come on. I know this is a bad thing to do to your wipers but put the wipers in intermittent with a dry windshield and for every 10 wipes the engine will stumble or die. Try it. So far I have bugged all the wires, cleaned fuse contacts, cleaned relay contacts, changed PCM relay, changed wiper relay and changed the PCM diode (all were rather cheap). No help. When I checked the codes it was the cam position sensor everytime. This is also my 3rd. CPS. The original ford one died 3 years ago. Then no problems until Nov 06. I put another CPS in and problem remains. The 2nd. and 3rd. CPS were NAPA brand. I am at a loss. I think my next move is a ford CPS or a wiper motor.
Mike

[cebulmer1]

The trucks like a goat huh doesnt like to get wet. Cps is all I have for you.

[rfdunk]

My truck does the same thing when it rains and ive heard the wipers have an effect on other trucks but mine skips even with the wipers off when it is raining.