PeachParts Mercedes-Benz Forum - View Single Post

oldtrucker · #6 10-13-2014, 12:16 AM

Yeah, those are expensive!
A new one from the stealership is running anywhere between $1600 and even $2000. At this price, out of the question. Between the two of us, ha, ha, I paid only $1000 for the car.
The rebuilt ones are about 50% of a new one.
And Victor, does charge about $300 for a rewire, but I don't like the looks of the wiring.
Also, the bench test he does, is in general a measurement of resistance on both ends of the rheostat. They are fairly large and I believe made of a carbon trace and slider.
In theory, if a vehicle is driven mostly in stop and go traffic (throttle is going between idle and some other position, constantly moving), the thin carbon layer could wear faster off in that range, causing false values.
They used to do that in the earlier cars with the potentiometer attached to the butterfly. This was a one way solution and most likely done without a computer, simply send a voltage to an OPAMP which in return controlled the fuel injector (indirect injection) looked like a carburetor.
Because of the high price, I went with junk yard model at $125 much more down my alley, ha. But I don't have any history of this Throttle control device.
I bet, I could find a new rheostat, if I search long enough through the internet.
These rebuilds have to get new ones, otherwise it would be a gamble.

Aside, I am almost convinced, I screwed up with the oil vent hose adapter repair.
The broken piece had only about a 1mm dia. hole, where fumes could restricted pass through. I had to drill it a little, to fit the brass tube that I inserted. That hole is now about 7mm and attached to the intake manifold via a 1 1/2 inch long rubber hose. There is no restriction in flow anymore, its like not having that hose attached to intake at all, allowing un-metered air to enter the intake manifold.
Been lazy this weekend, otherwise I already would have checked my theory.
Will check tomorrow and post the success or failure.