24 V Potentiometer install, cold starts and idling climbs

[enzo]

Hello everybody, i´m new in this forum. I have some trouble with my car ´92 300 ce 24 Ke3-jetronic, i´m experiencing difficult cold starts (none warm, cold valve does inject) and high revs idling (no signal going to idling valve whatsoever). Went to MBZ dealer and checked with their pulsemachine and they told me the Throttle valve switch is faulty and the O2 Sensor is in shortcircuit.
First, are those faults reason for cold start problems?
Second, in your experience, does the TVS fails? i couldn´t find any for my car but a gentle mechanic gave me one for a M103 300 e, dismantled it and found well done and almost impossible to die of natural causes. But before i open mine i want to ask you if it is made like M103 one or is it potentiometer like, with carbon tracks that would fade off.
Somebody told me could be the potentiometer in the Air flow Sensor Housing, pulsemachine says another thing anyway i purchased a new Pot. from olyonline. And don´t know what cares i must take to reinstall, are code to be erased or isn´t the case in my car.
Enzo

[sbourg]

Originally Posted by enzo

I have some trouble with my car ´92 300 ce 24 Ke3-jetronic, i´m experiencing difficult cold starts (none warm, cold valve does inject) and high revs idling (no signal going to idling valve whatsoever).

First, high idle with no drive to the idle control valve means either the valve is frozen open, or, more likely, you have an intake air leak. Most suspect with the KE systems are the rubber formed hoses in the idle air and breather circuits, but a loose or broken vacuum line is always likely too.

Steve