Nightrider350

My throttle valve cable isn't working. I've tried adjusting the tention on it but it's still not downshifting when i punch the gas. I'm afraid that if I go to far, I won't have full range of movement on the throttle and I might even break the throttle valve cable. What could be causing this?

Riley's35089rs+

Try this adjustment method...

Start with correct TV setting: To adjust the TV Cable skip the book method and do this: Press the 'D' shaped lock button on the adjuster and loosen the cable setting (The black housing that the metal cable is in will move forward). Now, have someone floor the gas pedal while you check to see if the throttle plate is open all the way. Usually they are off a little and will wiggle. Do whatever you have to do to get it open solid. Now, with the pedal still floored, press the 'D' button and pull the cable casing (the black tube) back as hard as you can (putting maximum tension on the metal cable) and release the button. You now have the engine, tranny and gas pedal all in sync at WOT. Mark the cable casing so if for some reason it gets moved you can know where to put it again. The problem with the 'self adjust method' is that it bends things and puts them permanently out of whack. It is also the full TV setting, which is theoretically what the GM method does.

Riley's35089rs+

Or the GM method...

GM 700R4 Throttle Valve Cable Adjustment
1. Remove air cleaner on vehicles with carb or TBI.

2. Depress lock tab down on TV cable and push cable all the way forward towards carb or injector.

3. Have someone sit in vehicle and depress gas pedal to the floor so it's at WOT (Wide Open Throttle). Hold it there for steps 4 and 5.

4. Now check to make sure the carb arm is bottomed out or has no more movement. If not, use a pair of Channel Locks to bend TV cable bracket until carb or injector arm no longer rotates.

5. Next, depress lock tap down and pull TV cable back (Pull HARD!) towards firewall or away from carb or injector until it stops and then release the tab.

6. Use a pocket knife or hacksaw blade to mark the cable in front of the snout. This is MAX TV.

7. After marking Max. TV depress lock tab and push cable forward toward carb or injector 1/8'' of an inch. Make a mark in front of snout. This is Minimum TV.

8. Set cable back to Max. TV and Road Test.

Nightrider350

okay, that makes sense. just to clarify:

- put the pedal to the floor for "wide open throttle," then pull the adjuster HARD back towards the firewall to make the cable as tight as possible. Cool, i'll do that tomorrow and I'll let you know

Riley's35089rs+

press the 'D' button and pull the cable casing (the black tube) back as hard as you can (putting maximum tension on the metal cable) and release the button

You have to hold ther button while you are doing this.

Nightrider350

don't worry, i knew what you were talking about w/ the 'D' button the first time. It's a pain in the butt to presh that thing, my thumbs all messed up . It's still not kickin' down, but I'm gonna try one more thing. I don't think it was tight enough.

Riley's35089rs+

one thing I did, because I had to fabricate a bracket, was hold the throttle wot the pull the cable back without the d button pushed and watched for my "bracket" to start moving or bending. Turned out just right for me. But not the "Correct method"