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914World.com _ 914World Garage _ Sticking Throttle

Posted by: vesnyder Mar 18 2006, 09:55 PM

I've done a number of upgrades and maintenance over the past week and now my throttle is really sticking - but it does not appear to be the cable. The throttle/revs stay real high and if I blip the gas pedal it subsides. It acts as is the throttle cable is sticking? Maybe it is, but I put in an oil pressure gauge and was wondering if I disconnected a vacuum hose, or reconnected them incorrectly when I was installing the pressure sender? Any ideas? I also just installed a clutch cable and thought it way be catching on the clutch cab, but it apperas to be clear? The easy fix would be installing the new accelerator cable (which I just purchased).

Posted by: alpha434 Mar 18 2006, 11:44 PM

To much crap on the TB. Clean it off. And replace the spring there.

Posted by: newto914s Mar 19 2006, 01:58 AM

and/or rub a little oil on the TB spring, had the same problem, pedal would accually stay a little depressed, and that cured it

Posted by: solex Mar 19 2006, 07:38 AM

I also had the same problem. I completely disasembled my TB. The main problem is that the steel throttle shaft is riding on the aluminum TB and will eventually get out-of-round.

Eventually I will take it to a machinist and have some brass (or bronze) bushings installed. But a really good cleaning and some good lithum grease has solved my problems for now.

Dan

Posted by: swl Mar 19 2006, 08:07 AM

QUOTE (vesnyder @ Mar 18 2006, 07:55 PM)
but it does not appear to be the cable.

Maybe lubricate the cable just for grins? With mine it was sticking like crazy. Detatched the cable and the cable ran just fine. Reattached and it bound again. Lubricated - it was just fine. I figure it was a combination of the bend and the tension from the spring.

Posted by: norustscott Mar 19 2006, 04:02 PM

ok, one clue...you recently replaced the clustch cable. It is really eacy to install the cable and end up with it twisted around the throttle cable. Ask me how I know....

Here is a test. operate the clutch in and out. watch the throttle pedal very carfully. Did it move? at all? if so, I suspect that it is wrappped in the center tunnel.

I suspect the blip motion of the throttle is enough to break the slight amount of friction that exists.

Another question. Is the pedal harder to depress now than before the clutch cable install? if yes then I would go there first...

Let us know how it turns out.

Good luck. Scott

Posted by: Racer Chris Mar 19 2006, 06:24 PM

QUOTE (norustscott @ Mar 19 2006, 05:02 PM)
It is really eacy to install the cable and end up with it twisted around the throttle cable.

It is real easy to get the clutch cable wrapped around the throttle cable in the front of the tunnel. A good indication of this is if the engine revs when the clutch is depressed.
The other common source of your problem is swollen pedal bushings from a leaky master cylinder.

Posted by: McMark Mar 19 2006, 06:29 PM

I vote pedal bushings.

Posted by: vesnyder Mar 20 2006, 09:43 AM

It ended up being a really worn and old throttle cable. Replaced it and it solved my problem - that was after I got the new throttle cable clear of the clutch cable. I had many of the symptons discussed - but it looks like I am good to go! Thanks