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Another possibility: ice.
The early Boxsters use a bourdon cable ( ‘bicycle cable’) that runs through a plastic tube under the carpet, then through the firewall, to the bellcrank on the other side/ exterior side of the firewall.
IF your Boxster leaks some water into the left floorboard it can find its way into the plastic guide tube and then into the throttle cable , AND the car sits outside on a freezing night, then ice may form in the throttle cable. The force you can apply with your foot to open the throttle is much stronger than the force the return spring can apply to close it, so you may wind up with the throttle stuck open.
For this reason it is vitally important, for your driving safety, that you should have a large insulated and climate controlled garage for your Boxster.
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Threaded Mode
