Having problems with a sticky throttle on my 71 super. I've just finished an EFI conversion using the german EFI plenum and throttle body, and the throttle feels like it is sticking on something. Basically you have to use cant operate it smoothly, jumps straight to over half throttle after you overcome the initial stiffness,

Here's the confusing bit....

It returns fine
Each individual part works smooth as silk (pedal, linkage cable, throttle body)
the cable is new, the bowden tube is new, the fanshroud tube is new.
Everything is lubed up with grease.



I'm at my wits end here, any bright suggestions? this is stopping me from getting the car drivable in time for the nats supersprint!

Does the back of the pedal sit right on the little roller on the linkage??

If the accelerator cable is to tight it pulls that roller towaers the driver and the pedal has to be pushed to go on the arc

Does that make sense??

Yeah, i know what you mean, its sitting nicely on the ramp, not too high.

Hi

Your car is sure taking shape.

If you open the throttle by hand do you feel it stick? The throttle stop could need adjusting as the butterfly could stick.

If not it could be how the cable is pulling on the throttle, you need it slow on the 1st bit and fast on the last.

I got it wrong on my old yellow bug and it was impossible to drive smoothly at low speeds.

Steve

My throttle body came without a stop, so I 've made one up. Definatly not that now and the it all moves smoothly by hand at the back of the car. I've tried it through a couple of locations coming out of the fan shroud with no noticable change (altering the angle of the cable pulling on the arm from idle)

It feels like when the cable is under load it drags and binds the whole way through its travel, but is completly free otherwise.

have you lubed up throttle buterflies.
do you have a good return spring.
on the old vn commodore the engine vacuum would give you a sticky throttle ,if the throttle body was dirty.
it would go to 2000rpm then not return to idle.
is it sticking on??
and reving to high.

It's not sticking on, just has a stiffness underfoot that makes it impossible to control smoothly. Returns to idle fine.
It's been suggested that I lube the actual spring on the throttle body so i'll try that when I get home from work, quick and easy to check.

not sure if your 71 model is a similar setup to my 61, but where the cable comes out at the front of the tunnel on the passengers side and then connects to a linkage arm, is this arm rubbing on the inside of the large cover over it.

I hope you know what I am talking about, if not I can try and find photos for you.

Kev

Yeah I know what your talking about, definatly no rubbing. It was rubbing last year at one point so I checked that straight away.
I'm going to pull the whole pedal assembly out tomorrow anyway and go over it just to rule it out.