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I had time for more detailed investigation yesterday.
The noise cessation when I turned off the climate control fan earlier in the week must have been a coincidence. When I turned off the fan yesterday at the start of my drive, it had no effect on the noise. On careful inspection, the noise seems to vary with engine speed for the first 9-10 minutes of the initial drive of the day. Then it stops and doesn't reappear during later drives on the same day. I'm beginning to research other potential causes. One area I'm exploring involves the secondary air injection system.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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