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#2
22nd May 2011, 07:35 PM
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Is the wife in the car at the time? Have you checked to make sure you're not making any involuntary noises?
Though, where does the noise sound like it's coming from? Could be the gearbox needing serviced.
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2010 Jag XF 3.0D Portfolio S I know.. I know.. 
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#4
22nd May 2011, 08:46 PM
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Could it be a door hinge!
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light. 
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#8
23rd May 2011, 09:48 AM
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Perhaps it's excited!
 Seriosuly thongh, needs looking at but could be something as simple as an air leak on the inlet/vacuum system. As the throttle opens quickly the rush of air can make a funny noise if it's leaking somewhere. Should be simple enough to find. I'd be suprised if it was the gearbox - not impossible but if it was bad enough to make a nosie I'd expect some kind of driving symptoms too.
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#9
23rd May 2011, 09:51 AM
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The Suction-Jet-Pump near the throttle body rubber boot is a common one for making dodgy noises.
It is a ventrui based devise that increases vacuum supplied to the braking system. If the car is equipped with an electric brake vacuum booster pump also then these can fail, putting toto much strain on the Suction Jet Pump and cause noise also. I may be a mile off but without actually hearing it this is my best guess
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#10
23rd May 2011, 10:03 AM
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On mine if definitely sounds like some kind of cavitation noise.. almost like blowing over a near empty bottle. I'll take a look at the throttle body if it ever stops raining
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2010 Jag XF 3.0D Portfolio S I know.. I know..
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