Noob advice on worn throttle shafts remedy

[AzioAceAzio]

Outside of a rebuild or replace has anyone found any success in remedying worn throttle shafts? I think it's causing some major vacuum leaks but I'm admittedly still learning how these work. '76 2.7 with weber IDTP crabs.

[Matt at Pelican Parts]

Hi AzioAceAzio,

Can you give a little more detail on what's going on? I tried to do some searching on the topic and found an older thread that might be of interest. Post #2 mentions worth throttle shaft bushings a a possible culprit and offers a few suggestions
https://forums.pelicanparts.com/porsche-911-technical-forum/581193-weber-crisis-faith.html

[Dpmulvan]

Originally Posted by AzioAceAzio

Outside of a rebuild or replace has anyone found any success in remedying worn throttle shafts? I think it's causing some major vacuum leaks but I'm admittedly still learning how these work. '76 2.7 with weber IDTP crabs.

Nope, if shafts are leaking you’ll need to pull carbs, dismantle, measure and replace worn parts, shafts/teflon bushing/ et.

[AzioAceAzio]

Thanks all for the advice thus far. Minor update and I wanted to get some feedback. The car generally runs and drives fine, maybe some slight stutter but I chocked that up to cold weather and carbs. Something interesting today though: at idle, the with the car up to temperature, if I were to floor the gas as if to rev as quickly as possible, the car starves and quickly dies. It will restart just fine. I did this 3-4 times consecutively, started to smell fuel so I stopped. Possibly my accelerator pump? Replace the diaphragm? Thoughts?

[lateapex911]

Certainly while looking into the throttle bodies when opening (by hand) the throttle you should see a accel pump squirt of fuel. (Be careful, a backfire while doing this could...at best...singe your eyebrows, or much worse)

The timing and amount are key to crisp throttle response.

On the throttle shafts, a good way to tell if they are influencing the car is to spray some starting fluid at them. If the engine surges, it's an indication that they are leaking.
Might be all 6 or a few. If there is no change in the idle of the car when spraying it on, that's an indication that they are tight.

Disclaimer: I've dorked with the Webers on my 911 to get it running better, then sold them so I'm no expert. There is a book "The Weber Tech Manual" by Bob Tomlinson out there. I'd be happy to sell you my copy if you'd like the deep dive info.