Almost 2 months ago my accel pedal started acting up. Sometimes when depressing it would do nothing. Took it to the dealer just before the pedal recall expired and they replaced it. Everything has worked fine until now. I'm having the exact same symptoms again, and even lost partial throttle. I can either coast or go really fast, there is no in between. If I try part throttle it will cut out and just idle or coast. The engine itself does not try to die or anything, just trying to maintain a constant speed or get moving from a stop is tough work now. Here's the thing:

1) When it happened before, I can't remember if it was raining or not, I seem to think it was. It happened yesterday immediately after I hit a huge water puddle during extremely heavy rain.

2) The only performance mod is my ICP mod (similar to BlackCloud's 18K mod). I have problems whether this is turned on or off. I have to turn it off right now or this truck really tries to outrun everything else.

I need some advice on where to look. Seems like some kind of short or water trapped somewhere, but I'm not positive. I haven't had a chance to look yet since it started last night, and I just got to work this morning (barely). Post your suggestions, Thanks!

 

I had the same problem you had, dead pedal when humid or wet. Replaced 3 pedal asslys before the dealer accidentally made the wire short out while replacing my 3rd pedal and found the problem. There is a frayed wire someplace. The dealer just taped my wire to keep it from shorting out. Sorry I can't be more help. All I can suggest is to find the harness and follow it looking for bare wire.

 

I had the same problem you had, dead pedal when humid or wet. Replaced 3 pedal asslys before the dealer accidentally made the wire short out while replacing my 3rd pedal and found the problem. There is a frayed wire someplace. The dealer just taped my wire to keep it from shorting out. Sorry I can't be more help. All I can suggest is to find the harness and follow it looking for bare wire.

 

I'd start at the PCM connector. It's in the engine compartment on the firewall under the master cylinder booster. That's where your TPS goes to, and it could get moisture up in that area. Or somewhere between the two. Hope this helps.

 

i believe i saw a whole pedal assy for sale somewhere the other day.... ebay possibly?

 

Just to keep everyone updated...

I had a bit of time yesterday to look, and the wiring harnesses under the master cylinder look like they have quite a bit of moisture. I did completely remove my ICP mod and now it is more driveable, but I'm still having the dead spot on the pedal. Basically if I hold it at a very light throttle it will simply cut out and idle. At times when I try to go from a stand still, I get no throttle response until I tap on it again. I'm going to check some more today on the wiring harness. If the problem goes away, then I can probably assume it was moisture that caused it.