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D3 - Engine Bay Everything under the bonnet

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  #1  
Old 28th February 2014, 08:38 PM
MAM MAM is offline
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Default Buzzing from engine bay

My car has developed a buzzing over the last couple of days. I could hear it from the cabin but, but when I opened the bonnet, the sound was much louder.

I have found the location, but I have no idea what the part is.

I have a 4.2 Petrol non-FSI engine. The part is under the rear engine cover and is like a disk that has a pipe up to it, and a pipe coming out of the side. The noise is like a high-pitched vibration. If I hold the part I can stop the sound - but what is this part?

edit - If my explanation is not good enough, here is an image
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Last edited by MAM; 28th February 2014 at 08:49 PM.
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  #2  
Old 28th February 2014, 09:08 PM
HPsauce HPsauce is offline
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PCV valve by the looks of it, probably leaking due to failed diaphragm. Easy enough to replace.
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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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Old 28th February 2014, 09:27 PM
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Adrian E Adrian E is offline
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I concur - may also be gummed up. Changed the one on our a6 a year or 2 back. Not too horrific on price from memory
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Old 28th February 2014, 09:35 PM
HPsauce HPsauce is offline
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About £25 including shipping from the USA for one I replaced a while back (on a D2).
I then dismantled the old one and cleaned it, so I have a reasonable spare, though the diaphragm isn't perfect, but does work OK.
Had to buy a tool to unclip it. Clic-R pliers I think they're called.
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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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Old 1st March 2014, 07:17 AM
MAM MAM is offline
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Thanks - I'll get one ordered, looks fairly easy to replace.
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Old 4th March 2014, 09:19 PM
daviesbike daviesbike is offline
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I had exactly the same problem just fixed it 7 days ago.. and on shutting down the engine it hooted.
Solution ...

A flat head take off the jubilee clips and then separate the casing and simply scrub all parts and spring ect with hot soapy water ..
Dry it out .. re assemble and lube up with WD40

And problem solved

I guarantee it will work !
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  #7  
Old 21st May 2014, 06:42 PM
MAM MAM is offline
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Well, as the car was in for its alloy refurb and it was spending a week on jacks, I got the garage to replace the valve.

All is much quieter now. It is surprising how little it takes for you to question it an A8, when in many of my other cars, it just happens to be one of many noises, and sometimes these things go unnoticed.
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Extended Aluminium, Oak Sepia Wooden Trim, Extended Leather
Green Exclusive Dual Colour, Heated Comfort Leather Interior
Green Alcantara Headlining, Pillars, Rear Shelf, Door Inserts
Green Trimmed Mats, Seatbelts, Steering Wheel, Centre Armrests
DAB, Freeview, ACC, 4-Zone Climate, Soft Close, Electric Blinds

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Old 5th September 2017, 04:30 PM
lackovicj lackovicj is offline
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apparently is a crankshaft vent. I replaced my one 2 weeks ago as i couldn't listen to the whistling noise anymore...it sounded like AC on full blast. Easy to replace at £23 cost.
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