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Old 05-20-2021, 02:39 PM
Diseasel300 Diseasel300 is offline
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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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