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It might also be normal if it is the Air Injection Pump. The pump runs for ~20-40 seconds on cold start to light up the cats quicker.
It lives right by your left knee when you are standing at the rear of the car gazing into the engine compartment.
Disconnect it for 1 cold start and see if the noise is still there. It will throw a code (CEL) if you leave it disconnected too long. When they start to go bad they sound like a skill saw. Sometimes you can save it ($1500) by cleaning it out when it gets really loud. They are easy to remove from the car, loosen three screws, disconnect the connector and hose.
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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