[R129 SL] ASR Problems

[Oldbenz1 at aol.com]

In July, Sr. Menichini responded to my question with a posting similar  to 
his current one.  I asked my good friend in Italy and who speaks perfect  
English to translate that response for me.  This is what Sr. Menichini  said in 
July: 
 
The sensor which drives the "servo-accelerator" is  positioned just behind 
the ignition pump and its price is approximately 600  euro.  Inside the ignition 
pump is located a small ceramic  potentiometer.  That potentiometer could 
deteriorate by time and  humidity.  If that is the case or if the potentiometer 
is broken, that  is the reason the ASR warning light comes on  occasionally.
 
Ok, so maybe on my car this sensor is bad (600 euro = $800 plus labor) ands  
maybe I also have to replace the "ignition pump" ($$$?).   As my M-B  service 
manager said, I can expect to see a repair bill in the amount  of  $1000 or 
more  with no guarantee that this will solve the problem  .  Sr. Menichini went  
on to say:
 
Further to that the accelerator pedal becomes hard  and the engine looses its 
power progressively. 
 
Now if I can determine what is meant by "ignition pump"   (fuel pump?), I 
suppose it would be wise for me to get into the pump and  take a look at the 
potentiometer.  This now raises the questions-  how  can this potentiometer be 
tested, and if found to be bad, can it be  replaced?  I certainly don't mind 
paying a proper fee to have my car  maintained in a safe condition, but having 
driven Mercedes cars for 45  years, I am very much aware that huge sums can be 
spent for needless  repairs if one does not investigate thoroughly and 
understand just what needs to  be done.  For many years I was in the business of 
restoring vintage (1950's  and 1960's) Mercedes cars, but today's cars with their 
electronic management  systems are a complete mystery to  me!  



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