Quote:
	
	
		
			
				
					Originally Posted by  Mustang_man298
					 
				 
				I know the auto trannies on the w123's use vacuum control and a bowden cable for shift control, is there also a version that uses an electric kickdown? Reason I ask is that my 80 has no bowden cable, or provision for one, and when cleaning the driver floor yesterday I pulled the carpet and found a round black button type switch hiding under the accelerator on the firewall, with a flat connector on it. I can mash on the pedal and it never does kick down until I pull the shifter down a notch, been that way since I've had the car. 
			
		 | 
	
	
 My first Mercedes was a W123 (300CD)
The kick down feature didn't work either.  One day while the car was raised I found a loose wire tucked almost out of sight near the rear of the tranny. Once I found where to plug it in, I realized I had kickdown!!
Could this be your problem too?