This may have been covered before on this registry.  My '86 Coupe began "surging" particularly at lower speeds (35-50mph) with the cruise on.  I discovered that the cable going from the cruise servo to the throttle had stretched a little in the 25 years I have owned the car.  It just required a tightening of the cable.  It is described in the Haynes or shop manuals.

______________

Did that correct the surging issue?

______________

Joel Adams  
My Link

    
(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Yes.  I posted it because I wanted to save C4 owners the trouble of going to a repair shop for a simple fix.

______________

thanks for the tip. mine was doing it from a vacuum leak. glad it's fixed.

______________


















the dynamic duo

c3vr life member #97

Adjusting the cable solved most of the surging problem, but I still noticed it at certain speeds.  I don't recall that it did it when new.  You mentioned that you had a vacuum leak.  Could you tell me where exactly the leak was?  I would like to do some further checking.

______________

the previous owner taped up the vacuum hose on the right side of engine that goes from the throttle body to the valve cover. i found it by accident. the cruise control will vary the speed usually within a mile of set speed. if it is a little bit that maybe normal. as far as a vacuum leak, check all your vacuum hoses. could be they need to be replaced.

______________


















the dynamic duo

c3vr life member #97