Question about 2002 Ford F150 Regular Cab

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Rough idle truck when wet.

I have a 2002 F150 6 cylinder truck that rough idle when wet in the rain. Why does it do that and how do I fix it? Thank you. Joseph.

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It sounds like the water is entering the engine compartment when the truck is driven. First be sure that the guard flaps under the front wheel wells are in place and not torn. Next remove the plug wires one by one and be sure that they are dry inside the ends. If so then using tune up gel fill the ends to cover the metal. When you re-insert the wires the gel will prevent water from entering the wire and causing the spark to short. Hope this helps. Good luck.

Posted on Sep 12, 2009

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This is geneally caused by moisture in teh electronics. Is there any reason water would be getting slung around the computer or plug wires or distributor. I would clean and change as needed. also they make a silicone grease that is great for water protection..its mostly use on 4 wheelers, but should do the same for a truck.

Posted on Sep 12, 2009

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