1979 Porsche 911



September, 7, 2010 AT 11:42 AM

Engine Performance problem
1979 Porsche 911 6 cyl Two Wheel Drive Manual 140.00 miles

I have 911 sc It starts an runs perfect, but after it warms up the idle wont go below 2000 rpm, its still fuel injected, vacum line are good and intact

1 Answer



September, 9, 2010 AT 2:24 PM

Check the aux air valve, it should be closed when engine is warmed up. Its controlled electrically and its designed to be a controlled air leak around the throttle plate. As the engine warms up it closes shut lowering the idle, or it could be a sticking throttle.

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