Throttle body supplemental spring / stiff gas pedal Options

[sfrenck]

Just started driving my "project" ('73 2.0L with 74' F.I. setup) up and down the block for my preliminary road test. One thing I noticed, and my 79 yr. old father really noticed, was the gas pedal was very stiff.

I have already replaced the plastic bushings in the pedal cluster with the brass rebuild kit. Tonight, I disconnected the throttle cable from the throttle body and confirmed the cable / pedal was not the issue. It seems that the supplemental spring on the throttle body is the culprit.

Is there a different, easier spring that I can install or is a stiff gas pedal just part of the normal Porsche engineering? Or, should I look for a '73 throttle body without the supplemental spring?

Thanks - Scott

[r_towle]

the cable also comes into contact with the coil if it is routed wrong and can become a ground wire..that melts the cable housing.

Replace the cable..its gonna break anyways...you may as well know its new.
Buy two..keep one in the car....they do break at the worst times.

For the throttle body..remove everything except the shaft and the brass plate. It should be super smoot in operation.
If the plate is out of adjustment...and it can be adjusted by moving it a hair in either direction, it will rub on the inside of the throttle body and can create a problem.

Clean clean clean...brake cclean and a brass brush, or dunk the whole thing in carb cleaner for the night...it will do wonders.

You state that its not the pedla...just check.
The pedal is part of the return spring function and it has a spring imbeddded in the base of the pedal that mounts to the floor.
Pull the rod off the back of the pedal and make sure the pedal stay erect on its own and after you push it down, it comes back up.

The two springs, the one on the pedal and the one on the throttle body are the ones that pull the throttle body back to idle.
Both need to be clean and fully functioning. I forget who taught me about the pedal, but its truely part of the return system.

The additional spring, the safety spring or suplimental spring is for backup and it puts suchs a side load on the throttle body that it will highlight worn bushings and misaligned plates.


RIch