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91 Burb cruise control slowly loses mph...............

Discussion in 'The Garage' started by BurbinOR, Aug 4, 2003.

  1. BurbinOR

    BurbinOR 3/4 ton status

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    Engages fine, but loses speed.............any idea what component to check/replace/find at a boneyard?

    TIA /forums/images/graemlins/thumb.gif /forums/images/graemlins/1zhelp.gif
     
  2. sapper

    sapper 1/2 ton status GMOTM Winner

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    might have a pinhole in the servo, black rubber thingamabob on the driver side of engine with linkage going from tbi to it
     
  3. sapper

    sapper 1/2 ton status GMOTM Winner

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    ok i had a ice cream in my hand and couldnt type to good, the cruise control servo is mounted on the fire wall or what ever its called the linkage goes from the tbi to it on the driver side of the tbi, its about the size of a moon pie, if it has a pin hole in it, when you set the cruise it will suck in to get the linkage in the right position but will slowly let the presure/vacum out causing you to slow down, if any of that makes sinse /forums/images/graemlins/eek.gif
     
  4. K5 NUTT

    K5 NUTT 1/2 ton status

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    Use a mighty vac to see if the servo is leaking down....the cruise recieves vss input via the drac...from the drac it hits the cc module...check that servo first and then we'll go from there.

    DW
     
  5. woody9

    woody9 1/2 ton status

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    my 91 occassionally does the same thing. As it doesn't always do it, i didn't think it'd be the servo.
    Keep us posted on what u find!
     
  6. DrMaserati

    DrMaserati Registered Member

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    When testing the servo, vacuum leakdown should not exceed 5" per minute. More than that and the servo should be replaced.

    JP
     
  7. BurbinOR

    BurbinOR 3/4 ton status

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    Will do Doug..........keep ya posted and I will keep picking your brain on this. Not a big deal but want it working. /forums/images/graemlins/laugh.gif

    Thanks all..........
     
  8. K5 NUTT

    K5 NUTT 1/2 ton status

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    Anytime Frank...going to BB03 this year....hint hint...

    DW
     

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