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#1
8th May 2017, 04:36 PM
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Any Thoughts On Where Noise Is Coming From
I've had an unusual whining noise from my car, but only under normal acceleration. Depending on the road noise, it can be heard from speeds of 30 to 70mph (it sounds like it's coming from the transmission tunnel which is why I put it here). It's been there ever since I bought the car four years ago and finally decided to try and capture the sound.
I've uploaded a video clip to YouTube, if you want to listen to it. The link is as follows: https://youtu.be/f1dh6RcGf5Y You can hear it best around the 20-30 second mark, and see when I'm accelerating. I don't know if this has anything to do with it, but I just discovered that one of my intake manifold actuators isn't working properly. Looking from the front of the car, it's the one on the left. I just happened to see another video on YouTube of how these work, and since I was using my GoPro today, I thought I'd capture these as well. They both deflate when the ignition is turned on, but only the right one inflates when you rev the engine. Both inflate again when engine stopped.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts Sold!  2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II HeadlightsMy DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds 
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#2
8th May 2017, 06:34 PM
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I would be pretty sure that the noise is not related to the manifold actuation. It doesnt sound too good though, I am afraid to say. Did you not get the tx serviced at one stage at Mackies? If it has been there since you've had the car then it (surely?) would have been picked up there? But it certainly sounds drive train related.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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#3
8th May 2017, 06:40 PM
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It sounds to me something more like a washer or shield or metal fixing rattling, maybe just something on the undertray?
If it was inside the transmission, with all the lubricants/fluids, that type of noise seems implausible.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.). 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#4
8th May 2017, 08:02 PM
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Have you checked for loose heat shields. I had one once (on a Beemer) that was bolted up tight, but the shield had broken right around the bolt head. Result, it looked OK, but at speed would free up and make a racket
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A journey of a thousand+ (epic) miles, begins with a single step, (to the door of an 8). Lau Tzu
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#5
8th May 2017, 08:46 PM
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Quote:
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Confidence is the feeling you have before you know better . . . .  Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#6
8th May 2017, 10:24 PM
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Could it be related to the air conditioning? I know mine makes a little noise, not like that though.
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Cars... '93 Audi Coupe 2.0 Alpine White (sold) '99 Audi S4 Merlin Purple - K04 upgrade to 412hp (sold) '00 Audi S8 Agate Grey (Sold )'11 Audi Q7 4.2tdi Unknown Red (Classic Red Pearl Effect - thanks MJ) 
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