S4 sticky gas pedal when warm, ideas?

artikulieren · Feb 21, 2010

Hello there,
my 91 S4 has developed a very irritating problem that as the car warms up the gas pedal hangs up at resting point, makes it VERY hard to drive my car in Chicago, where I live. It will hang up then jump free causing it to really bang the driveline, impossible to bring on throttle smoothly... I've lublicated all areas visible from the top with synthetic axle grease (always have best luck with it on pivot points) but it hasn't helped. Any idea what is causing this and what a cure might be?
Regards,
Kevin

msiert · Feb 21, 2010

Maybe it's getting hung up on the throttle stop?

artikulieren · Feb 21, 2010

I feel silly now, didn't see the sprung part of the linkage below intake manifold rearward of where that last rod is up to actual throttle, spring was rather rusty, that must have been the culprit. A good soaking seems to have sorted it now! hurray!

papajam · Feb 21, 2010

My suggestion was going to be the bellcrank (which you already found). Our 89 did the same thing which required removal and disassembly of the bellcrank. Cleaning and lubing the shaft and bushings solved the problem. Also replaced all the throttle rod ends.

Eastep · Feb 21, 2010

try cleaning all the gunk from around the pedal and possibly re-greasing it

Andrew · Feb 21, 2010

As papajam mentions, very common on all Bosch Spiders for the throttle bellcrank under the plenum to get hung up with rust, caked grease, etc. Remove, clean, lube.
Andrew

S4 sticky gas pedal when warm, ideas?

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