Cruise Control malfunction
Thread Starter
Instructor
Joined: Dec 2003
Posts: 205
Likes: 0
From: Cupertino ca
Cruise Control malfunction
the cruise control doesnt work on my 96. When its switched to the on posistion and i try and set it nothing happens. It used to work perfectly, and never gave me problems, the fuse is good, all wire connections are good and the vaccum hoses are connected. The throttle linkage is also good. Could this be a faulty switch?
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
Re: Cruise Control malfunction (CaliforniaVette)
Could be switch. Could be servo. Make sure servo cable is taught but not too tight with throttle body completely closed. Also, some models haveTraction Control and Acceleration Slip Regulation which interact with anti-lock brakes and Engine management systems. Therefore, I unfortunetly other than cable adjustment am not qualified to help much on these other areas..these are areas where I would have to throw in the towel and see a dealer 
..Thank God (knock on wood) mine hasn't had any probs there because 
I HATE throwing in the towel!! I wish I could be of more help but since no one else had a reply I just thought I'd give my 2 cents. Good luck.
..Thank God (knock on wood) mine hasn't had any probs there because I HATE throwing in the towel!! I wish I could be of more help but since no one else had a reply I just thought I'd give my 2 cents. Good luck.
Burning Brakes
Joined: Oct 2002
Posts: 983
Likes: 1
From: Bergen County NJ
Re: Cruise Control malfunction (CaliforniaVette)
When this happened to my '94 it was the vacuum/brake switch (that's actuated off the brake and/or clutch pedals) that went out of adjustment. The retaining bracket that holds the switch in position is plastic and eventually breaks. Replacement was ~$7. Before '93 the bracket was metal - what was GM thinking?
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: Cruise Control malfunction (Pete K)
BTW, from what I've read the servos rarely fail, so chances are good that the problem is a switch at the brake pedal (clutch pedal too if you have a manual), fuse, a vacuum hose (they're two) or the connection at the servo.
Jake
Jake
- 1986 Original Owner -
Joined: Apr 1999
Posts: 3,193
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From: North Yorkshire, England
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Re: Cruise Control malfunction (JAKE)
With the above two comments. I did find a bad servo last year though. It wasn't actually a bad servo, but the problem was in the servo. One of the thin wires that goes from the servo connector to one of the coils inside the servo was broken. It was an early C4. So they do fail, but rarely. Just for grins, when running down the road, put your foot under the brake pedal and lift at the same time you try to engage the cruise. If you have a manual, try the same with the clutch pedal. If the switch is out of adjustment but close, this will verify a switch/actuator issue.
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
Re: Cruise Control malfunction (Ray Quayle)
Servo went south on my old 84 (RIP) hence my suggestion..but I am more inclined to agree that it's probably a pedal switch or vaccume or cable adjustment issue since those are the more common.
[Modified by skateparkdave, 9:45 AM 6/29/2004]
[Modified by skateparkdave, 9:45 AM 6/29/2004]
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From: San Jose Pat Tillman - American Hero
Re: Cruise Control malfunction (skateparkdave)
If your car is a manual, check one more thing. I thought I had cruise control issues on my 96 as well - sometimes it would work, sometimes it wouldn't. Since there is no deadpedal on C4s, I sometimes lightly rest my left food on the clutch pedal while cruising at highway speeds. I'm used to automatics where touching the brakes deactivates the CC - on manuals, either pedal will do it. Make sure you're not resting on the clutch before you throw any money into it!
I know, it sounds simplistic and stupid, but it's possible!
I know, it sounds simplistic and stupid, but it's possible!