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Discussion in 'The Garage' started by buster boy, Feb 2, 2004.

  1. buster boy

    buster boy Registered Member

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    /forums/images/graemlins/burb.gif <font color="red"> </font> My 87 GMC burb is shifting way late &amp;only at high rpms(not smooth)? help!
     
  2. t's85chevyk5

    t's85chevyk5 Registered Member

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    you first might want to check you detent ( kick down) cable.
     
  3. POWERMAD

    POWERMAD 1/2 ton status

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    That would be a TV(throttle valve) cable issue.
    Locate the TV cable and where it attachs to the bracket there will be the cable adjuster.
    Thre is a small tab in the front, depress the tab and push the slide back in away from the TBI unit. release the tab and move the throttle to the wide open position. The cable should automaticly adjust.
    If after a test run it is still acting up disconnect the cable and check to see if it moves freely.
    Instead of posting the same question over and over just reply to your thread with TTT (to the top) to get it back to the top of the page if no one is responding.
     
  4. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Is it a 1/2 of 3/4 ton? 1/2 ton is a 700R4. 3/4 ton is a TH400.

    If it's a 3/4, then the vacuum line has come off the modulator, or the modulator is bad.

    If its a 1/2 ton, then do what the other guys said.

    John
     
  5. buster boy

    buster boy Registered Member

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    how do i tell i tell if the TV cable is bad ? I tried the adjust trick , how do you replace it?
     
  6. buster boy

    buster boy Registered Member

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    how do i replace the tv cable? thnx for your help!buster boy
     
  7. buster boy

    buster boy Registered Member

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  8. Calclips

    Calclips 1/2 ton status

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    The cable does not really go "bad"... just out of adjustment. The valve that the cable actually attaches to can become stuck up with crap if your tranny is starting to come apart, had it happen on a z71 that I have. Might look into having a shop look at the cable issue, but make sure not to drive that thing much with it doing that or you'll fry that tranny.... ask me how I know /forums/images/graemlins/mad.gif
     
  9. Calclips

    Calclips 1/2 ton status

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    Oh... to try and free up the valve, take the cable off of the throttle linkage and, while the truck is running and in park, move the cable in and out a few times, and then put it back on and see if that helps...
     

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