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Old 04-27-2014, 06:49 AM
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No go when trucks wet!

I'm having a problem with my 2002 f250 7.3. Every time my truck gets wet from rain or the car wash it will just idle no throttle pedal and my check engine light comes on. The other morning driving to work cruise set check engine light came on pull up to stop light and truck won't move. I have looked under the truck for loose connections and under the hood. Does anyone have an idea where to start looking for loose or bad connections?
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Old 04-27-2014, 11:01 AM
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GEM module behind fuse panel. Look for water intrusion.
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Old 04-27-2014, 11:05 AM
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What is the gem module?
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Old 04-27-2014, 11:36 AM
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Your '02 doesn't, really,,, have one. The new electrics put, what Ford calls, a VSM (Vehicle Security Module), and is now located behind the radio. These are not prone to water intrusion from a leaking windshield (as the earlier ones were).

The next thing I would look at is the OD sw wires under the column for signs of chafing. Here's a good link, although I realize you're not blowing fuses yet.

https://b7445ba3-a-62cb3a1a-s-sites....attredirects=0

Now, as I said, this has nothing to do with water I don't think but it's a Free fix that I would start with because it's so commonly associated with TPS (Throttle Position Sensor) issues like you're describing.

This isn't happening Only because the Wipers are ON - right? You say Car Wash as you drive away...
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Old 04-27-2014, 12:37 PM
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I will try washing the truck and see if wipers have anything to do with it and I will pull cover off the column here in a couple min.
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Old 04-28-2014, 11:32 AM
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Did you find anything when you pulled the column cover?
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Old 04-30-2014, 02:22 PM
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No didn't find anything I did drive it to work on Tuesday with the wipers on it sprinkled all the way to work and it never acted up.
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Old 05-03-2014, 04:25 AM
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I had a gray cps sensor that would stall the truck as soon as it got wet. Changed it to a black one and not one reoccurence since.
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Old 05-03-2014, 06:18 AM
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Stall? Would the truck die or just go to idle.
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Old 05-11-2014, 06:03 AM
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Quote:
Originally Posted by putzer View Post
I had a gray cps sensor that would stall the truck as soon as it got wet. Changed it to a black one and not one reoccurence since.
Mine was doing something similar. when it would rain and I was driving the truck would knock hard every few min and check engine light would come on...other times I would have no throttle response if it rained all night and I left for work. I changed fuel filter and used some snake oil thinking I got bad fuel. Finally said heck with it and changed my CPS again. Once I did that ran like a charm...never had an issue since.

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