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Q: Why do you have to put your foot on the clutch when starting the 997? There are a lot of issues on other engines causing bearing problems from doing this, as the crank isn’t fully supported. The switch is also prone to failure. Was this a legal requirement and is it something that can be safely bypassed?
Scott’s answer: As far as I am aware, it isn’t a legal requirement. Clutch switches are used in modern cars to aid the use of stop/ start for emissions reasons, so it will know when to stop the engine.
With regards to a 997, when dipping the clutch, it prevents starting the car in gear for safety reasons, avoiding the car jerking forward. This is useful, as more and more people leave their car in gear when parked. It also reduces wear on the starter motor as the clutch will be disengaged – it creates less drag on the engine because gearbox components are inactive.
I have heard of cars that have bypassed the clutch switch, but it can induce fault codes logged in the DME as the engine management system will think the clutch is constantly depressed. There you have it!
Scott Gardner Job Title Gold Diagnostic Technician Place of work Porsche Centre Bournemouth, UK Time at Porsche 11 years