How to adjust a GM Throttle Valve Cable

The throttle valve cable plays a very important role in shift timing, shift feel and overall transmission longevity. Therefore, proper adjustment is absolutely critical!

Difficulty: Easy

Instructions

1. 
    

   The absolute first step is to find the TV Cable adjusting mechanism. If you don't have a clue, it is on a bracket with a cable going to the throttle linkage. A TPI is shown, but the TBI and Carburetor are similar.

2. 
    

   The next step is to push in on the "D" button on the adjuster mechanism. You may have to push very hard on the "D" button, it may be stiff.

3. 
    

   While pushing down on the button, you need to push in the cable retainer until it bottoms out.

4. 
    

   Once the cable retainer is bottomed out, then you need to turn the throttle blades (by turning the throttle linkage) all the way. This may require some effort, since the TV Cable will need to ratchet out of the adjuster. Rotate the throttle all the way and the adjuster will "ratchet" out. Once you are sure the throttle is all the way, then no further adjustments are needed. DO NOT open the throttle from the gas pedal, this may cause inaccurate adjustments.

Tips & Warnings

• This procedure isn't usually part of normal maintenance. Unless you have replaced something (cable, transmission, throttle body, etc..) or you are having shift issues, then it probably doesn't need to be done.
• Do not deviate from posted procedures. A cable too tight can cause overly harsh shifts which can lead to part breakage and a cable too loose will cause slippage and clutch burn up.