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Cruise Control won't maintain speed

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Old Jun 1, 2014 | 12:02 PM
  #1  
danleo's Avatar
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Cruise Control won't maintain speed

1992 Camaro RS

Cruise works... sort of.

Lets say you put the cruise on at 70mph. The speed will fluctuate from 70mph-78mph and you can feel the car very aggressively accelerating and engine braking. Like you are being pushed forward, then back, then again accelerating.

Any ideas on how to repair? I don't know if this year car is controlled by computer or not. I just bought it. Still tinkering around with it.
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Old Jun 1, 2014 | 12:56 PM
  #2  
IrocRoadRacer's Avatar
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From: Illinois
Car: 1989 Camaro Iroc Z
Engine: L98
Transmission: 700R4
Axle/Gears: 9 Bolt Borg Warner/ 2.77 gear
Re: Cruise Control won't maintain speed

Check the cruise vacuum lines for a leak.
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Old Jun 3, 2014 | 04:51 AM
  #3  
ssj2link's Avatar
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From: Boynton
Car: 2000 Trans am vert 87 GTA
Engine: 5.7/5.0
Transmission: T56/700R4
Re: Cruise Control won't maintain speed

i had ther same problem and it was a bad vac line, replaced it and it worked like normal again
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Old Jun 3, 2014 | 09:27 AM
  #4  
Ozz1967's Avatar
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From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Cruise Control won't maintain speed

Also, check the linkage on the cruise module itself where it connects to the cable going to the throttle. Is it hooked by a ball-chain or is it a solid connector and screw that holds it on?

Being a 92, I don't think this will be your issue, but some models had a ball-chain that connected the cable to the cruise module. If not tightned properly, would cause the cruise to "hunt" for the right spot because when you "set it", the chain could have slack in it causing some issues.


Other than that, I agree with previous posters about a vacuum leak causing it.
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Old Jun 3, 2014 | 11:44 AM
  #5  
Bob88GTA's Avatar
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From: Huntsville AL
Car: 88GTA
Engine: 5.7TPI
Transmission: Auto
Axle/Gears: 3.27
Re: Cruise Control won't maintain speed

Also check connection to the vacuum ball in the front drivers fender.
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Old Jun 3, 2014 | 09:30 PM
  #6  
danleo's Avatar
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Re: Cruise Control won't maintain speed

Ok where is the cc vacume line located and where do i buy a new one?
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Old Jun 4, 2014 | 08:18 AM
  #7  
Ozz1967's Avatar
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From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Cruise Control won't maintain speed

Originally Posted by danleo
Ok where is the cc vacume line located and where do i buy a new one?
Follow the vacuum lines from the servo module on the firewall.

You can buy hose-length cut to fit at Autozone or the like.
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