Any GM exclusive mechanics? 6.5 Diesel ?

Turtle n Peeps wrote:


How do you know it has no codes? Did you check or just because it has no CEL?

It could be 2 things:

#1 Accelerator Position Sensor or TPS. (most likely the problem)

#2 The pedal itself.

I would check both with a VOM. Bet it's #1 but I have been wrong before. :B

In fact after reading your post again I will bet you a dinner it's the TPS. And that is 4x'x as cheap as the pedal. :)

Let us know what you find out.

I don't know what CEL stands for, but I do have a code reader. Recently with the service throttle light on it has not thrown any codes, but last year a couple times I did get the "check engine light" on and it did indicate throttle position sensor when I looked up the codes online. After clearing them I'd secretly hoped the truck had healed itself and I went on some long trips with my camper without a problem.

But recently I've been asking my truck to work hard, more than it probably should, hauling my big cab-over camper and pulling a four horse trailer at the same time. Then last weekend towing my (over 10,000lb) travel trailer. Seems it only happens when it's working very hard, because my empty commutes to and from work never causes anything to go wrong.

Where is the Throttle Position Sensor? On the injector pump? I haven't a clue. Thanks everyone for your replies, and I did locate a brand new pedal assembly for $320 at Accurate Diesel on line if I have to go that route. Hope to replace the TPS switch first though. Hans