Quote:
Originally Posted by Gilly
Follow the throttle cable and see if it ends up at a throttle position sensor, sort of a can-shaped sensor that the throttle cable is actually pulling on. Wondering if something may have came loose on that, like a simple lever problem that may have come and gone. If nothing else maybe you can try repeating the fast throttle action you had to give it and see if the problem is repeatable. The lever loosening up is about the only thing I can think of that would possibly cause this and not set a code. Unless the cable actually broke, but that of course won't clear up later on. I don't see how the cable could "stick" at closed throttle. If it stuck at open throttle you'd have a different problem. Pretty weird. I bet the duck-azz charging at you would have had his bell rung if he hit your G, or was it another big vehicle?
Gilly
|
Gilly, Thanks for your quick and accurate response.
Actually he was a young "ricer" driving a small "ricer" - probably a small Honda. He'd have been hurting badly, if he'd have hit.
Thanks also for your response on the probable problem. I think you're right on. I had posted on another forum without any response. Then, all of a sudden I got three responses - two from owners of the same vintage G500 who have had the same problem with the TPS unit. Then, another mechanic who specializes in vintage G's piped up with the following, which probably explains it better than anything:
Quote:
Part 012 542 33 17
Actually, it is a PVS (Pedal Value Sensor) and it is a common problem with this unit not only on a G, but in other MB vehicles with M113 engine. When you pressed you pedal to we metal you activated WOT (wide open throttle) position inside the sensor.
Sometimes Engine control module can not return back to normal operation condition.
Because it is not a “Hard Code” when you restart the vehicle is enough to return you car back to life.
|
Attached is a photo of the "problem child" unit. I do have an additional couple of questions:
1.) Does replacing this unit require any calibration or fine adjustment?
2.) Should that screw cap in the lower left corner of the photo (on the throttle cable?) be screwed in place? It's been unscrewed and free floating on the cable for the three years I've owned the truck.
Thanks again for your great assistance! Happy Trails!