dchiswel

Hello Folks. New member here. Just picked up my 1987 560sl. Beautiful great car. When I set the cruise it engages and maintains speed so it kind of works. What it does is pulse constantly to maintain speed but it does maintain. From what I can see there is an ECM for the cruise and an Actuator. Which makes most sense to replace. Or are there vac lines like on the old GM cars and I just need to search the vac lines. Any help would be appreciated. Thx Dave

MJ50

moved to R107 forum...

AlterSchinken

The cruise control on these cars is not the best, most everybody I know says the speed control is not smooth especially on a level road. Mine (1985 380SL) is the same, not too bad but sometimes annoying. It is electro-mechanical, no vacuum is involved. The only diagnostic info available requires a Mercedes special tool. You can get rebuilt control modules and new actuators, but they are expensive.