Hello everyone,

this is an everlasting topic and will be I am certain of that. Anyhow - this is what I found about my CC:

Symptoms : works most of the time, engages after 2 seconds after being set. It has always done so. I noticed my father's W210 CC engages instantly with no delay. I consider this 2 second delay normal.

Question : how long does a working CC take to engage on a W124 diesel?

CC has had a long history of symptoms : they began when I pulled the actuator upwards - to speed up. CC would cut off and would refuse to work unless the ignition was switched off and on.

Sometimes it wouldn't work even after turning the ignition on/off. Always after some time it would work again. Sometimes with CC engaged I would drive over a slight bump on the road - noticeable but not too much. CC would disengage and would not want to engage anymore. Again, after a few hours it would.

Now the situation is that it engages fine, I can speed up pulling the lever up but when I slow down (lever down) CC will cut out and would not work anymore unless being reset (ignition off and on).

I have taken apart the motor on the engine block (that pulls the gas bowden), cleaned it inside (and successfully put all parts back into it) but the symptoms are the same. So, no motor.

I have taken the CC amplifier out and re-soldered each and every contact. No change.

There is a box at one side of the amplifier (007 545 54 32). I thought it was a relay box. I took it apart to clean the contacts but there is no relay inside - only 5 or 6 resistors on a circuitry board. That is all. I re-soldered them all. No change.

I also suspected the Hall sensor at the speedometer's side but now thinking of it - CC works fine, speeds up when I want it to and keeps desired speed I have concluded the following :

1. The Hall sensor is good - otherwise CC wouldn't work at all or act erratically and not keep a set speed

2. The motor is also good - to keep a set speed it must turn left and right to speed up and slow down

3. It must be the amplifier - because CC quits work when I slow down by pulling the lever down but otherwise works great. Must be either an electrical or logical problem. After having re-soldered everything I ruled out cracks. I think it must be a faulty component on the amplifier board. Now - which one? I have no idea.

Question : are there any other components to cruise control I have overlooked to look at?

I checked for the price of a new amplifier (005 545 05 32) - it was $645. I don't think I need it that urgently - especially when it works (just don't pull the lever down). I wonder what happens next. What is the price refurbished amplifiers come at?

.