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Dead throttle - 2002 7.3L Super Duty
I've read about 500 posts today trying to figure this out, but no luck so far so I'm starting a new topic from scratch.
First, a little history...
About 3 months ago I drover through some flooded roadways (no not over rivers/creeks/washouts) and sent a bunch of water up under the truck. Almost immediately my truck became unresponsive to the throttle (gas pedal). I nursed it home hoping that something was just wet...
The next day it started fine and was responsive, with a few exceptions... Every now and then it would act like it was going to go, but then it would just drop back to idle. Not a nice feature when pulling out in intersections.
Since then it has been about 99% responsive, but does have an occassional hiccup and doesn't respond for a few seconds.
In recent days we have been hit by an ice storm... In the days leading to the storm it was probably in the low 40's with some mild freezing. I was out getting firewood going up and down steep hills. I noticed that when heading up steep hills, the truck would stall (not die, just drop back to idle). It was definitely reproducable.
I once again nursed it home... Then the ice storm hit. Now it will start, but it is 100% non responsive to the gas pedal.
Note: Today the emission system light is on... It came on back when I went through the water too, but it's been off since... Right now it is steady on.
WHAT I'VE TRIED (to no avail):
1.) Replaced the cam position sensor as I've seen a lot of posts on that. No luck. In fact, I experience some of the hard-to-start symptoms after replacing it, but it seems to fire up pretty quickly again now.
2.) Unplugged the wiring harness off of the gas pedal assembly. Used compressed air to blow off all connections and linkages that I could see. Never could see any exposed switch.
3.) Check wiring through visual inspection. I've read about wiring harnesses being melted and shorting. I found nothing. All wiring appears to be entact and none of the shielding is damaged.
4.) Checked all fuses under the dash.
5.) Drank a few beers to get clarity. No luck. Still confused. I might try this a few times though to see if it helps.
Any help or ideas would be appreciated. I'm lost. I am loosly speculating that there is water somewhere in some system. I'm guessing that the freeze has turned that water to a solid and it's jacking me up somehow. I should be able to test that theory tomorrow when the temperatures are up.