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#1
6th April 2024, 12:01 PM
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S8 Manifold flaps
Just come back from a long drive and I noticed this strange noise when I accelerate, it seems to be coming from the front of the V, under/in the manifold... I'm assuming I've cought the flaps in the early stages of failure.
How long do I have until I need to take this apart, I've done this job on a previous car but before it started making noise. but I use this car daily.. Thank you in advance.
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Toby Current: 2007 S8 D3 5.2 V10 - Jap Import in Daytona Grey 2004 BMW X3 2.5i Manual (Old Workhorse) Previous: 2009 S5 4.2 V8 - Phantom Black with Red leather interior 2006 A4 3.0tdi Manual - Black with Black Leather 2001 BMW 323ci 2.5i Manual 
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#2
6th April 2024, 12:47 PM
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Quote:
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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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#3
27th April 2024, 10:17 AM
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Managed to find alternative transport so I'm no longer driving the car luckily.
I took the chance to take the throttle bodies off and run a test on VCDS, the flaps appear to be completely fine, back to the investigation I guess.
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Toby Current: 2007 S8 D3 5.2 V10 - Jap Import in Daytona Grey 2004 BMW X3 2.5i Manual (Old Workhorse) Previous: 2009 S5 4.2 V8 - Phantom Black with Red leather interior 2006 A4 3.0tdi Manual - Black with Black Leather 2001 BMW 323ci 2.5i Manual
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#4
26th October 2024, 04:58 PM
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Update for any that are interested.
I "deleted" the flaps for peace of mind and the horrible noise went away! I haven't noticed and difference in performance at all, and whilst I had the manifold off, I cleaned the intake and she runs so much smoother now! Also noticed the oil filter housing gasket was failing, a decent qty of oil in the channel between the V, replaced that and cleaned up. Very time consuming job to be honest, entire thing probably took 12 hours over the course of a few weeks.
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Toby Current: 2007 S8 D3 5.2 V10 - Jap Import in Daytona Grey 2004 BMW X3 2.5i Manual (Old Workhorse) Previous: 2009 S5 4.2 V8 - Phantom Black with Red leather interior 2006 A4 3.0tdi Manual - Black with Black Leather 2001 BMW 323ci 2.5i Manual
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#5
Yesterday, 09:25 PM
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Those flaps almost "killed" my first S8 so I had no hesitation having them removed ASAP from my second one, they're a PITA
 Both were "de-coked" while stripped and as you say, no noticeable loss of performance.Well done for tackling it yourself, it's quite a bill, even from an independent 
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Audi D3 S8 - 2007 - V10. B&O, Phantom Black, black and silver interior, and still completely standard with everything working as it should  SOLD 2023  Audi TT - 2015 - Ultra
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