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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,222
Yeah thats the air pump.
I think it blows air into the exhaust ports for the first couple minutes after a cold start and then a vacuum solenoid triggers the 2 air pump diverter valves to send air to the catalytic converter the rest of the time including full throttle but I'm not sure.

The odd thing is you say you have a 1979 car...
The catalytic converter (if you have one), air pump, and aluminum lambda fuel head all came out in 1986 to meet USA emission standards at that time so Porsche could sell the 930 in the USA again.
As far as I know none of that stuff existed before '86 so if it's there I'm guessing it was installed in your car later.
Old 06-10-2010, 11:20 AM
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