Any GM exclusive mechanics? 6.5 Diesel ?

HJGyswyt wrote:
Yes, I'm still driving my old 96 Silverado with 6.5 Diesel.

Mechanically it's very sound and reliable. Several years ago I replaced the PMD (Fuel Solenoid Driver)with an after market unit that was advertised to cure the problems so many 6.5 owners had with their injection pumps. My PMD is located away from the engine in the front bumper and working great.

Recently I've been getting a yellow flashing light on the dash that says "Service Throttle Soon". It's not the check engine light. When the light comes on I loose cruise control and sometimes (not always) the engine de-powers itself. Cycling the key three times cures it and it runs fine until the next episode, which can be two minutes or two hundred miles.

This truck is the first year GM was drive by wire for the injector pump. I'm wondering if the control unit attached to gas pedal is going bad? I've been told this component is around $500.00 these days.

I'm not getting any codes, and the truck runs great pulling hard even though it's only 190 horsepower. Diesel's have come a long way haven't they. Thanks for your input, Hans

Alright, first things first.

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

BTW, 96 was not the first year of TBW for the 6.5. 94 was.
Yes diesels have come a long way but I still like my 6.5 for a daily driver better than my Duramax. :)

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.