Model:
1987-1988 Mercedes 300E, 300D, 300TD, 190D, 190E

Symptom:
Cruise control will disengage intermittently. Engine cuts out when vehicle comes to a stop.

Beginning with the production date of May 1987, the Hall-effect sensor, which is mounted on the speedometer, may have a defective cold solder joint on the sensor output pin.

If your vehicle exhibits these symptoms;

1: Cruise control will not engage at all.
2: Engaged cruise control will disengage intermittently.
3: Your 1988 vehicle cuts out when you come to a stop but will restart immediately.

Gently wiggle the output pin. If any movement is detected, the sensor is defective and should be replaced. After June 1988 an improved part was made (stamped 6.88) even though the part number remains the same.



I experience these symptoms, so I think I will try this out, once I resolve my fuel related matter.