Have 110K on the X. Over the last year I noticed my throttle response has deminished. I have a problem when I start the engine cold and step on the go pedal the truck will sometimes go to idle and the GP lite will come on. It finally got to me last Friday so when it was in this limp mode I mashed the go pedal back and forth to the floor about 7 or eight times. When I got my sh** together again and hit the go pedal WOW did it every go. Never had that kind of throttle response before. So I shut the engine off and did the go pedal back and forth thing about 25 times. Throttle response has been great since then. I had no wrench codes for the sensor either before or after my little temper tantrum. Now having a background in electronics I did some checking on the APP sensor. Found out that it is made up of 3 potentiometers. Well over time any potentiometer will get dirty, unless hermitically sealed, and build up a coating on the potentiometer components, especially the wiper. This will degrade the sensor performance. I'm going to get an new sensor and replace it. Then I'm going to take the old one apart.

Bottom line: depress and release you go pedal 25 to 30 times with the engine off to clean the potentiometers and see if your throttle response improves.

DSMMH

 

LOL that conjured an image, thanks for sharing that with us, good info mixed with a bit of humor is always nice to read. Glad you got it figured out.

 

According to the coffeetable book, the three potentiometers must match outputs. If one is different, the MIL will light but performance will be normal. If two are different, it goes to the idle/limp mode and the MIL lights. Could be the pots or the wiring connectors, or the computer, I would guess, but changing the pedal assembly is probably the right step to take.

Brian

 

I got to see the insides of one once but not there relationship to each other very good. One of the drivers drove his Peterbuilt over one. Kinda smushed it pretty good.

I tried spraying electronic cleaner in them before but they are sealed petty good so it didn't work too good.

 

DSMMH - that is a great suggestion because I am having the same thing with my truck. I will be following your post and hope to see some photos of this sensor once opened.