More gas pedal woes

[kenikh]

I thought I had it cured. My throttle lever was deflecting on full depress and getting stuck under the firewall, so I ordered a new one thinking the old one was fatigued. After waiting two weeks for it to arrive from Pelican, I installed it tonight. Guess what? Same darned thing happens.

It appears that the pedal is stopping its travel at the end of where the carbs stops hit and the force of my foot (which isn't very much; my wife was able to do it, too), bends the throttle arm at the pivot shaft, casuing it to slide under the footwell firewall.

Is there supposed to be some sort of mechanical stop that prevents this from happeneing? I am going to tear back into it tomorrow morning, but in the meantime, does anybody have any ideas or good photos of their pedal cluster, especially if it is still installed?

Thanks in advance!

[kenikh]

One more thought before bed. Are your gas pedals adjusted so that the floorboard acts as the throttle travel stop?

[Elombard]

On my 73 there is a big adjustable plastic doohicky to keep it from going all the way down. When the foor board is out it will hitch like you describe. I wonder if you are missing a part?

[kenikh]

I don't have an adjustable plastic doohicky. I have been fiddling with the adjustable bar between the pedal and the floor to see if I can limit full travel to when the pedal hits the floor, but that just seems weird to me.

Does anybody have a picture of the doohicky?

[Elombard]

The do hicky is a throttle stop. (not sure if that was clear in my intitial rambling :-))

I suspect this will solve the problem. You cant see it in any of my pics. I will try and snap one later.

[kenikh]

Awesome; I will take pics of mine (and lack of throttle stop) as well.

[kenikh]

Here are those pics. Here's a partial of the floorboard showing the brake pedal opening and the slot that the throttle coupling rod goes through:



And here is a pic of the pedal cluster itself:



Hopefully this will help you guys in-the-know figure out what the heck is going on in my car.

[jpnovak]

It looks like you do not have a throttle stop.

I assume that this is an aftermarket or DIY floor board. It does not look like the stock plywood. YOu can make your own throttle stop with a bolt, two nuts and a few washers. Drill a hole that matches the round flat spot on the upper rear of your gas pedal. use one nut on each side of the floor board to secure the bolt. Adjust the height until you just get WOT and tighten down. A few drops of locktite helps too so you don't crush your floor board.

I personally do not run floor boards in my car with carbs. The carbs have a throttle stop to limit travel unlike MFI TBs. As a safety measure I notched the lip on the tunnel where it curves into the front pan/fire wall. It was a small notch to prevent the throttle bell crank from wedging and getting stuck. I also welded a support to give lateral strength to the othewise weak bell crank.

[Elombard]

Jamie is right on. You should buy a wrecked floor board (for like 5 bucks) drill out the rivets on the throttle stop and reuse or do as Jamie says.

[kenikh]

Thanks for all of the help. You guys were right on the money; it is definitley not a stock floorboard.

It seemed odd that my car didn't have a throttle stop. I still find it odd that when the throttle travel hit the throttle stop on the carbs (which my car has now, but won't for long) that the throttle arm bends so easily. What is even wierder is that it took so long for this to crop up (a few months) from the car's purchase date, yet the new throttle arm bent SO easily and quickly.

I will do some searching on Ebay for throttle stops (Porsche or otherwise). If I have no luck, it's off to the classifieds for a WTB ad. I may go the ghetto "bolt and nuts" route until then.

I'd still apreciate seeing a pic of Porsche throttle stop, just for my edification.

Thanks again.