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D2 - Engine Bay Everything under the bonnet |
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#1
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Help! S8 Scary Engine Noise...Worried
Hi all
My 2002 S8 has developed a worrying engine noise.....any idea what it is? Not even sure if its safe to drive to the indi! Sounds like top left of engine as you look as you stand in front of car Link below can be cut and pasted into browser to listen Thanks Mark http://youtu.be/rhE6tbx_cw8 |
#2
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I presume that the revs were steady at tickover throughout that clip? Does it change with revs?
If I remember you dont have VCDS?
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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. |
#3
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Hard to say from video but it could be secondary air injection pump if the noise come from air filter box area in which case you could just temporarily disconnect it. If you have VCDS you might be able to test it using output tests or as Audi call them final control diagnosis.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure |
#4
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I don't have VCDS - but may take car off the road and order it! |
#5
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Noise seems to resonate more when I take the oil filler cap off.... |
#6
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It does sound like some sort of electric fan is constantly on as Ainarssems says.
I assume the electric radiator fan is not turning when you hear the noise? |
#7
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No fan is not on. I am nor driving it today and am ordering VCDS for myself to see if that points me in the right direction! |
#8
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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 Headlights My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds |
#9
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Where do I find this and how do I test it?
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#10
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Its the black plastic UFO type object at the back of the engine. Here it is in a picture I borrowed from another forum member's post as it shows the engine bay without covers. It is easy to remove by jubilee clip or the Audi type clip, but I'm not sure if its safe to run the engine without it or with the rubber hose plugged to test if the noise stops? Probably ok for a minute or two, as its just a sprung rubber diaphragm to let some crankcase pressure out when it builds up enough to be able to open the diaphragm. This is how it looks inside: http://forums.quattroworld.com/a8/threads/8649.phtml Last edited by Goran; 1st January 2015 at 11:09 AM. |
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