Pontiac GTO Forum banner

1 - 5 of 5 Posts

·
Premium Member
Joined
·
262 Posts
Discussion Starter #1
I have a 1966 GTO with the original 389-

My question is when I (or any of you) press the accelerator pedal all the way, what causes the pedal to stop?

A. The accelerator cable has been pulled its entire length and the carb linkage stops have bottomed out.
B. The pedal is hitting the floorboard and can no longer travel farther.

My situation has been B and I've noticed I never really got to WOT, even my outer carbs would maybe open 30% max.

My accelerator cable, accelerator cable bracket, stock Tri-power carbs and linkages are all stock with correct part numbers... I don't see any adjustability to the original parts either. Recently I purchased another original accelerator pedal to compare to my current one. Both still hit the floor with my carbs not fully open.

I removed the jute from under the carpet in that small area and that didn't help any. 2 days ago, I finally decided to heat the accelerator pedal framework and bend it. I bent it enough so that the pedal can now travel far enough to completely pull accelerator cable and have the carb linkage stops hit the base. The pedal is now about 1/4" off the floor at its full travel and does not touch. I took the car out to test and it is so much more lively and WOT is actually loud and pulls harder than ever before.

Does this sound like the right fix? Am I going to snap my accelerator cable by having all the stress on it, or is that how it is supposed to be?

Thanks
 

·
Registered
Joined
·
447 Posts
I guess that's one way to do it...but tension on your cable is never a good thing. On my 67 cable bracket I cut in another notch to draw the cable back enough to get the extra out of it w/o the tension on the cable or carb.
17715-c47eae4f2de94a37954533f39b29e581.jpg
 

·
Premium Member
Joined
·
262 Posts
Discussion Starter #3
Is it the carb tabs that stop the entire action? If so, then isn't the accelerator cable carrying all the tension when the carb hits the stops? Or is all of this happening at the exact moment the pedal touches the floor and the pedal on the floor is the fail safe from snapping the cable?

Right now when I step all the way down (pedal stops about 1/4" from the floor as mentioned above) the results are great but I'm not mashing the pedal down as hard as I can knowing the cable would take the stress.

Thanks for the feedback. The notch on your cable bracket is a good idea.
 

·
Premium Member
Joined
·
233 Posts
The adjustment should be made in the "L-shaped" linkage attached to the accelerator pedal to match the full-throttle point of the carb linkage.

This is suggested in the 1968 service manual on page 6B-2 with a 1-9/16" ref dimension for the back of the pedal to the floor. Might be different for 1966, but this is what the Pontiac tech folks evolved to....
 

·
Registered
Joined
·
447 Posts
You might have someone putting the pedal all the way down w/o excessive pressure while you pull the carb lever back. If its already bottomed out on the carb you will have cable tension.You may want to leave a little cable on the table.
 
1 - 5 of 5 Posts
Top