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#1
20th March 2010, 10:52 AM
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honk-honk
Further to the thread I started earlier entitled 'bearing noise' I have now isolated the problem.
Its coming from a circular 'thing' which is located under the plastic cover on top of the V8. This 'thing' is possibly part of the crank fumes recovery system and is located near to the rear of the engine. I got a friend to blip the throttle when the problem was especially bad, and we quickly isolated this 'thing' as the prob. It resonates and produces the noise. Why I was able to temporarily stop it by scooshing the poly-v with WD-40 I'll never know. Anyways, what is this thing? Can it be repaired and will a new one cure the prob? Has this been seen before? 
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#2
20th March 2010, 01:09 PM
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Photo of said thing would be useful.
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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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#3
22nd March 2010, 02:10 PM
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Well, it's some sort of breather for sure. The pipes go into the top of the block.
I went to Audi Glasgow. The can get one tomorrow. £54 + VAT. I thought I'd have a look at the old one first. Took it off. Took it to bits. It's designed to come apart for cleaning Inside is a diaphragm of some sort and a spring and a lot of mayonnaise.  Cleaned out the mayo, can now running fine with no honking sounds. Just hope I've not wasted the poly-v or anthing else with my idiot WD-40 scooshing.  Car seems quieter running too.
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#4
11th March 2022, 12:30 PM
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Mine has just started honking from the diaphragm too, am sure I had the same issue with my 4.2QS many years ago.
Does anyone have a how-to guide to remove, clean and reattach?
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2019 BMW M5 (my daily driver) 2002 Mark's D2 S8 FE 2020 BMW M340d xDrive (Anely's daily driver) 2000 FL D2 4.2 QS - SOLD 2011 
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#5
11th March 2022, 12:48 PM
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Few clues in here, you presumably know where it is: http://forum.a8parts.co.uk/showthread.php?t=15370
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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! 
Last edited by HPsauce; 11th March 2022 at 01:03 PM.
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#6
11th March 2022, 01:14 PM
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Quote:
I know Mark replaced it a couple of times, and I discovered recently that if you put the Meyle one low on the pipe in to the manifold it honks, and lifting it up stops it. Bizarre, but it was repeatable with two of them.
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#7
11th March 2022, 11:50 PM
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In case a new one is required, anyone got a part number for the Meyle version (based on Mark's comments on HP's thread)?
Oil and filter service was done (Mobil 1) today at Deutsch Tech near Milton Keynes, £169 all in
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2019 BMW M5 (my daily driver) 2002 Mark's D2 S8 FE 2020 BMW M340d xDrive (Anely's daily driver) 2000 FL D2 4.2 QS - SOLD 2011
Last edited by sarg; 11th March 2022 at 11:53 PM.
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#8
12th March 2022, 07:19 AM
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100 899 0078
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#9
12th March 2022, 10:28 AM
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Not that I doubt you at all MJ, will order one from Prestige on Monday, but this website https://www.euspares.co.uk/parts/meyle/2116986 states:
"This product № 100 899 0078 doesn't fit the vehicle AUDI A8 D2 (4D2, 4D8) S 8 quattro (265 kW / 360 hp) Petrol" Autodoc website seems okay with it though
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2019 BMW M5 (my daily driver) 2002 Mark's D2 S8 FE 2020 BMW M340d xDrive (Anely's daily driver) 2000 FL D2 4.2 QS - SOLD 2011
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