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Old 11-27-2020, 12:25 PM
Join Date: Nov 2013
Posts: 43
280sl erratic cruise control

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

Any thoughts?


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Old 05-19-2021, 06:53 PM
Join Date: Nov 2013
Posts: 43
I guess I should have said the car is 1985.

Does anyone know if this is vacuum cruise control
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Old 05-20-2021, 02:39 PM
Registered User
Join Date: May 2016
Posts: 6,023
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.
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Old 08-07-2021, 10:32 PM
Join Date: Nov 2013
Posts: 43
The car magically healed itself. Must be the German engineering magic.

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