Cruise control surges on 82SC

[RSBob]

When the cruise control is set the car will slow just a bit and then accelerate to the selected speed. When it hits that speed it starts to slow and then accelerates back to the selected speed over and over again until I get tired of surge slow surge slow and turn it off. My guess is a vaccum leak but where? Or ca. It be something else?

[ClickClickBoom]

Your control unit has bad capacitors. Lots of threads, I have one, search under my name.
Here:
Cruise Control Fix

[RSBob]

Most excellent. Thanks for the tip.

Where does the afore mentioned unit live?

[Nickshu]

In the frunk under the black fiberboard cover near the brake booster. Silver rectangular box.

[RSBob]

Here ya go Cruise Control Fix

[Peter Zimmermann]

Be warned, "the fix" doesn't always "fix" it. I've driven SCs that were almost new that surged. My '82's CC control box was "rebuilt", and still surges. Sometimes there's nothing that can be done; I can't remember ever driving an SC with the CC set, and have consistent speed. Some of the CIS vintage cars are a little smoother than others, but to find one that works as well as a modern car, that would be something.

[crownarch]

Or you can do like I did and send it out for a fix with lifetime warranty for $79 bucks! See my post under "cruise control brain"