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What are common failure points for cruise control?

Discussion in 'The Garage' started by afroman006, Jul 14, 2004.

  1. afroman006

    afroman006 1/2 ton status

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    My burban has it but it doesnt work. I figure for the 4 hour drive to college it would be nice to have. Thx
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    have had the rivets break/rust though that hold the rod on
    the vacuum lines leak/missing
    controls not hooked up
     
  3. sapper

    sapper 1/2 ton status GMOTM Winner

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    what brike on mine was the cruise control servo, its a round black rubber disk that works off of vacum, there is a linkage on the driver side of the engine that runs from it (on the firewall) to the TPI, my linkage broke, but the rubber also has a tendancy to dry rot, rip, whatever that wont hold air.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    There is a pretty simple procedure for troubleshooting the electric cruise control setup in teh service manuals.

    I believe at one time I wrote it up, but it's probably been so long it no longer exists if you search. Hmm, so I guess I was lazy:

    Cruise troubleshooting chart

    But that's only for the electrical, not the mechanical stuff.
     
  5. txfiremank5

    txfiremank5 1/2 ton status

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    I'd say the most common is vacuum line leaks. Any time it's stopped working on either mine, or a friends vehicle, that was the problem. Check that first, and go from there.
     
  6. Thunder

    Thunder 3/4 ton status

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    Here's sum stuff to check.
    Check fuse
    Check for vacume leaks/bad vacume lines
    Make sure wireing is good. If your cruise is operated from the blinker switch,it is a common problem that the wires to it may be broken or shorted
    There is a vacume switch on the brake pedal that turns off the cruise when you hit the brakes. Make sure it is operating properly and not leaking vacume.
    Bad throttle control diaphram/servo
    Bad cruise control module. This is a black box under the dash above the brake pedal.
     

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