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  #1  
Old 20th March 2010, 10:52 AM
Simon Wallwork Simon Wallwork is offline
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Default 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  
Old 20th March 2010, 01:09 PM
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Conan_the_Librarian Conan_the_Librarian is offline
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Photo of said thing would be useful.
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Old 22nd March 2010, 02:10 PM
Simon Wallwork Simon Wallwork is offline
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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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Old 11th March 2022, 12:30 PM
sarg sarg is offline
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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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Old 11th March 2022, 12:48 PM
HPsauce HPsauce is offline
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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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Last edited by HPsauce; 11th March 2022 at 01:03 PM.
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  #6  
Old 11th March 2022, 01:14 PM
MikkiJayne MikkiJayne is offline
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Quote:
Originally Posted by sarg View Post
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?
Try loosening the lower hose clamp and lifting it up on the pipe slightly.

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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Old 11th March 2022, 11:50 PM
sarg sarg is offline
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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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2020 BMW M340d xDrive (Anely's daily driver)
2018 BMW M4 SOLD 2021
2015 Mini Cooper S John Cooper Works (Anely's Mini #3) SOLD 2021
2016 Mercedes-AMG C63 SOLD 2018
2014 BMW X5 3.0d M Sport SOLD 2017
2009 BMW M3 DCT - SOLD 2015
2010 Mini Cooper S Auto (Anely's Mini #2) - SOLD 2016
2002 Porsche Boxster Tiptronic S - SOLD 2013
2000 FL D2 4.2 QS - SOLD 2011

Last edited by sarg; 11th March 2022 at 11:53 PM.
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  #8  
Old 12th March 2022, 07:19 AM
MikkiJayne MikkiJayne is offline
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100 899 0078
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  #9  
Old 12th March 2022, 10:28 AM
sarg sarg is offline
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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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2020 BMW M340d xDrive (Anely's daily driver)
2018 BMW M4 SOLD 2021
2015 Mini Cooper S John Cooper Works (Anely's Mini #3) SOLD 2021
2016 Mercedes-AMG C63 SOLD 2018
2014 BMW X5 3.0d M Sport SOLD 2017
2009 BMW M3 DCT - SOLD 2015
2010 Mini Cooper S Auto (Anely's Mini #2) - SOLD 2016
2002 Porsche Boxster Tiptronic S - SOLD 2013
2000 FL D2 4.2 QS - SOLD 2011
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