Gas pedal

[nycjap]

Hi everyone. I recently purchased a Superformance MKIII and when it was delivered the gas pedal was loose and the engine does not go past idle unless the pedal is completely floored. Any tips on how I can correct this? Is it at the pedal or at the carb or somewhere else? Sorry for my stupidity in advance and appreciate your help.

[rodneym]

Sounds like your linkage slipped.
Will it rev fine manually on the carb?

[Blas]

Is is an adjustment to the linkage or a problem at the pedal?

[nycjap]

That's what I am trying to determine. Yes, it revs fine manually at the carb. So if the linkage is slipped, then what?

[Mark IV]

There are "arms" attached to the bellcrank that have likely slipped. Most likely one of these is loose. They are held tight with setscrews. You need someone in the car to push the pedal while you watch from under the hood to determine where the slippage is.

[Antny]

Mine did the same thing when I first got it. I ended up removing the pedal from inside of the car and modifying it with a welded nut/lock-bolt to cinch against the "flat" on the pivot. Frustrating and difficult to work in that tiny space, but it's been fine since.

[Antny]

I just re-adjusted my gas pedal linkage setup. My gas pedal was always much too "hard" to operate, difficult to feather the throttle. I finally dove into it last night and fixed it; I adjusted the rods by lengthening them a bit (backed out the heim joints about 5 turns each). This gave my bell-crank assembly more mechanical advantage, resulting in a MUCH improved pedal feel, and a greater range of motion. Happy happy joy joy.

[ACademic]

Originally Posted by Antny

My gas pedal was always much too "hard" to operate, difficult to feather the throttle. I finally dove into it last night and fixed it; I adjusted the rods by lengthening them a bit (backed out the heim joints about 5 turns each). This gave my bell-crank assembly more mechanical advantage, resulting in a MUCH improved pedal feel, and a greater range of motion.

Check the secondary throttle blade orientation at WOT (if you are running a double-pumper w/manual secondary linkage). You may have corrected the geometry to make the pedal easier to actuate at the expense of not getting a full 90 degree opening on the secondaries. Perform this check with the car off and someone mashing the pedal for you while you peer down the throttle body. If vacuum secondaries, then ignore this post.

[Antny]

Good point. Yes, I did that. Had the wife mash the pedal while I peered into the mouth of the beast! I'm getting the full brunt of the carburetor now, that's for sure! Mechanical secondaries.