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It turns out the shop did the "is the oil filler cap tough to remove" test, not a manometer: dammad - Thanks, I'd seen that on forums, too, but nothing more official or explanative. Tried it the other night and the cap was about as easy to remove as with the engine off. No appreciable stumble, but rpms do rise when replacing the cap. I was also able to get the squeal when doing that. More video! JFP in PA - Thanks for the recommendation. Can you point me to a spec on what I should expect for that engine (MA1.02 / 9A1) at x rpm?
Hello - I have an odd situation I can't find solid info about online, and my Porsche-specialty mechanic is stumped. Can anyone here help? Since December/January, I have had an increasingly prominent squeal/whine sound coming from the rear of my 997.2. Initially, it only occasionally occurred quietly when I actuated the clutch pedal. Now, it's louder, sometimes whines for short periods or cycles (wooo...wooo...wooo - here's a video) without clutch activity, and I can make it happen nearly on demand holding the clutch pedal about halfway through release. Background: