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oldan 11-27-2020 12:25 PM

280sl erratic cruise control
with cruise on the car surges forward and then backs off
it will do this continuously

Any thoughts?


oldan 05-19-2021 06:53 PM

I guess I should have said the car is 1985.

Does anyone know if this is vacuum cruise control

Diseasel300 05-20-2021 02:39 PM

I'm surprised that you haven't received a reply since November!

Being 1985, you have the electronic servo system. You could have a fault in the cruise control amplifier, or in the electric servo attached to the accelerator linkage. Both are common.

Look at Kris Rose's website (he goes by JamesDean on this forum):
Overview — Cruise Control Repair

FWIW, my 560SEL was surging, essentially full throttle or nothing, very rough! Mine was the servo that was the problem. Fortunately I had a spare in my parts collection that solved the issue.

oldan 08-07-2021 10:32 PM

The car magically healed itself. Must be the German engineering magic.

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