Cruise control
Thread Starter
Racer
Joined: Apr 2000
Posts: 499
Likes: 0
From: Kristiansand
Cruise control
I just cant get my cruise control to work properly. It seems to have far to much amplification and speed oscillates wildly around the setpoint, making it useless.
Is there a fix for this problem?
How is your cruise control working?
Is there a fix for this problem?
How is your cruise control working?
Drifting
Joined: Mar 2001
Posts: 1,514
Likes: 1
Re: Cruise control (Ingar, Norway)
Mine works fine. There is the transducer which the speedometer cables go thru and it controls vacuum to the servo. More then likely the transducer is going out. Another possibility is a vacuum leak in the servo. Both parts are available thru Zips or your favorite vette parts supplier. Sorry I don't know of any testing procedure on the transducer, on the servo you could pull a vacuum on it and check for leaks. Good luck
Melting Slicks
Joined: Mar 2001
Posts: 3,365
Likes: 5
From: Lake Villa IL
Cruise-In IV Veteran
Cruise-In V Veteran
St. Jude Contributor
Re: Cruise control (Ingar, Norway)
I know of guys on this forum, who bought their cars new. And from day one, the cruise acted strangely. Others say theirs have always worked fine.
Mine will engage, most times. And it might hold for a mile. But sometimes, it will take off like a batt out of hell. Other times, it just cycles, up and down. I haven't done anything with it yet. But I will.
Good Luck with yours!
Mine will engage, most times. And it might hold for a mile. But sometimes, it will take off like a batt out of hell. Other times, it just cycles, up and down. I haven't done anything with it yet. But I will.
Good Luck with yours!
Racer
Joined: May 2001
Posts: 489
Likes: 0
From: beach fl
Re: Cruise control (Ingar, Norway)
I also had a bouncing speedo needle along with a cruise control that refused to hold steady. Just replaced my transducer and both problems disappeared. :yesnod:
Rick :cool:
Rick :cool:
Thread Starter
Racer
Joined: Apr 2000
Posts: 499
Likes: 0
From: Kristiansand
Re: Cruise control (Ingar, Norway)
Thanks!
I have checked that the clutch mechanism is operating freely. Have even bench tested the unit and it seems to work normal.
The problem is that it adjusts the actuator vacuum far too much, just as a control system with too much amplification.
I understand it must be a transducer problem, but I would like to find the cause and fix it. No replacements are available over here.
(When I started working on this I made an "analysis" of the operation, have article on that at my page)
I have checked that the clutch mechanism is operating freely. Have even bench tested the unit and it seems to work normal.
The problem is that it adjusts the actuator vacuum far too much, just as a control system with too much amplification.
I understand it must be a transducer problem, but I would like to find the cause and fix it. No replacements are available over here.
(When I started working on this I made an "analysis" of the operation, have article on that at my page)
Drifting
Joined: Mar 2001
Posts: 1,411
Likes: 2
From: St. Louis, Missouri
Re: Cruise control (Ingar, Norway)
Try locating a used one. Do you have access to any wrecked GM vehicles there? The cruise control transducer is common to many GM vehicle platforms, not just Corvettes.
[Modified by Neo Fender, 12:01 PM 5/7/2002]
[Modified by Neo Fender, 12:01 PM 5/7/2002]
Instructor
Joined: Apr 2002
Posts: 132
Likes: 0
From: Indianapolis In
Re: Cruise control (Ingar, Norway)
I'd need to look at my transducer to be sure, but it seems to me that the transducer has a threaded brass tubing where the vacuum hose connects. The fitting has a jam nut on it. You can loosen the jam nut and screw the brass fitting in and out of the transducer. Moving the fitting in or out can adjust fluctuations. I think that there's a hole that's covered and uncovered by turning the fitting, controlling the vacuum rate and signal from the engine.
Make sure that you're using manifold vacuum and not carb vacuum(not likely, but it's something to check).
Like a lot of people, I like to see how far I can drive on cruise-control without touching the brakes. And, no, it doesn't take much to amuse me when I'm driving my vette.
Good Luck, Mike :)
Make sure that you're using manifold vacuum and not carb vacuum(not likely, but it's something to check).
Like a lot of people, I like to see how far I can drive on cruise-control without touching the brakes. And, no, it doesn't take much to amuse me when I'm driving my vette.
Good Luck, Mike :)
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Racer
Joined: May 2001
Posts: 489
Likes: 0
From: beach fl
Re: Cruise control (Ingar, Norway)
I've seen NOS and rebuilt transducers on ebay quite often. There is a used one currently listed;
http://cgi.ebay.com/ebaymotors/ws/eb...219334&r=0&t=0
Rick :cool: