I installed cruise control on my 230CE. It has the wiring harness and
amplifier from a 1982 300D and the actuator on the engine is from a 84 190E.
The engine is from the 190E.
It doesn't work as well as I expected. First, it will not engage until about
45 MPH. The manual says it should be about 25 MPH.
Secondly, it over shoots the set point. If I use the accel mode it will
continue to accelerate for 3-4 MPH after I release the lever. Same thing
when I use decel, it will slow some more after I release the lever.
At about 60 MPH it uses wide throttle positions to maintain speed. In other
words it gives hard throttle and gets +1 to 2 mph then no throttle to
give -1 to 2 MPH. It is so bad that I have to turn it off. This is on level
road. At higher and lower speeds, it holds speed smoothly.
I tried an amplifier from a 190E and the accel works but it will not hold
So, I guess my question is, is this the way cruise control works on these
cars, or is there something wrong?