A8 Parts Forum  

Go Back   A8 Parts Forum > A8 D3 > D3 - Engine Bay

D3 - Engine Bay Everything under the bonnet

Reply
 
Thread Tools Display Modes
  #1  
Old 6th April 2024, 12:01 PM
Toblahoe Toblahoe is offline
Junior Member
 
Join Date: Apr 2023
Posts: 25
Default 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.
Attached Files
File Type: mp4 20240330_160328_1_1.mp4 (7.97 MB, 470 views)
__________________
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
Reply With Quote
  #2  
Old 6th April 2024, 12:47 PM
steamship's Avatar
steamship steamship is offline
Senior Member
 
Join Date: Jun 2013
Location: Londonderry, Northern Ireland
Posts: 3,132
Default

Quote:
Originally Posted by Toblahoe View Post
How long do I have until I need to take this apart
How long is a piece of string? My advice would be to stop driving the car and get it done. If you continue to drive it as a daily, you may come to regret it.
__________________
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
Reply With Quote
  #3  
Old 27th April 2024, 10:17 AM
Toblahoe Toblahoe is offline
Junior Member
 
Join Date: Apr 2023
Posts: 25
Default

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.
Attached Files
File Type: mp4 0427-01_1714210288060.mp4 (22.35 MB, 397 views)
__________________
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
Reply With Quote
  #4  
Old 26th October 2024, 04:58 PM
Toblahoe Toblahoe is offline
Junior Member
 
Join Date: Apr 2023
Posts: 25
Default

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.
__________________
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
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 11:30 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.