|
D2 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again |
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Need your input - S8 undercar rattle
2002 S8 with 110k Km on the clock.
Symptoms. No issues on cold engine. However, on hot engine I have a undercar rattle that varies with RPM. No errors, loss of effect or CEL. I will try to be spesific: Car sounds like a diesel but sound is not from front of car, more from under it. Included a clip that hopefully can help you to help me. Is this a bad Catalytic Converter or something else? Thanks in advance Yggdrasil Manual link to video: http://www.youtube.com/watch?v=atrP4FFVHAE |
#2
|
||||
|
||||
loose exhaust heat shield somewhere? Had this on an old Scooby that only manifested itself when hot, as the metal expanded.
Zip |
#3
|
|||
|
|||
welcome from norway to the uk.
well video sounds bad and since im a pessimist i would say crankshaft bearings or gearbox are finished. can we see some more interior pics , as im looking into audi exclusive interiors at the moment, and have about 100 different leather pics. |
#4
|
||||
|
||||
It could be the cats... Difficult to tell, I guess the acoustics in a garage are different to what it would sound outside. It sounded a bit throaty in a nice way, but didnt hear enough of the rattle really....
.. and yes, the interior looked nice as you panned across it at light speed... more more...
__________________
For parts enquiries and Forum User Administration please contact customer services directly, not me - enquiry@a8parts.co.uk, www.a8parts.co.uk, or call 01642 783537 The Daily Town Car - 2023 Tesla Model Y Performance. Black with Black. Giant ipad screen, huge sunroof, 4 wheel drive, Tow bar, lots of ooomph and made in China, so actually built properly unlike the Californian ones. The Family Wagon - 2018 Tesla Model X. Black, 7 Seats, Towbar, Homelink, Enhanced Auto pilot with Summon and self park, Heated front seats, CCS Charger upgrade, MCU2 Upgrade, Falconwing Doors, Self opening / closing doors, Netflix, Spotify, toys, Air suspension, alcantara roof + lots of other stuff...... The 17 year old Driver Wagon 2015 Skoda Citigo Monte Carlo. Alloys, Power steering, Aircon, Leccy windows, Sat Nav, bluetooth, central locking, cup holders, 59 whole bhp. Million times better than my first car. Well jealous..... The First 20 Audis: 2001 D2 4.2 QS Silver, 1997 D2 S8 Silver, 1999 D2 4.2 Silver, 2002 D2 S8 Dolphin Grey, 2003 C5 RS6 Blue, 1998 D2 S8 Black, 2000 D2 4.2 QS/S8 Ming Blue, 2003 D3 4.2 Ming Blue, 2005 B7 S4 Blue, 2006 D3 3.0 Tdi Black, 1999 D2 4.2 Silver, 2003 D3 4.2 LPG Crystal Blue, 2000 D2 S8 Silver, 2007 3.0 Tdi Q7 Black, 2009 B8 S4 Black, 1998 D2 S8 Agate Grey, 2006 D3 4.2 Tdi Blue, 2006 D3 S8, 2007 Q7 3.0 Tdi, 2006 C6 S6, The Second 20 Audis: 2011 A7 Sline, 2001 A2 1.4 Tdi Black, 2002 A2 1.4 Tdi Silver, 2006 A8 4.2 Tdi Blue, 2007 4.2 Tdi Q7, 2006 S4 Cab Silver, 2010 RS6 Saloon Black , 2007 TT Roadster, 2010 A8 D4 4.2 Silver, 2006 C6 A6 2.7 Tdi Quattro, 2000 D2 4.2 QS/S8 Ming Blue (again), 2008 Q7 4.2 Black, 2009 C6 RS6 Saloon Daytona Grey, 2001 Fully Loaded A2 Tdi, 2006 Avant S6 Black, 2007 VW Caravelle Exec Black (almost an Audi) 2009 TT Roadster Daytona, 2015 Q7 4.2 tdi lava grey, 2002 GmbH D2 demonstrator, 2006 D3 A8 LWB 4.2 Tdi Black Most Recent Audis: 2001 A2 1.4 Tdi Black, 2007 4.2 FSi Q7 ABT Blue, 2016 S5 Coupe Launch model, 2004 S4 B6 Cabriolet, 2016 Q7 Sline White, 2006 Q7 4.2 FSi Black, 2012 Q7 Sline+ 4.2Tdi White, 2008 Blue Audi S8 Everything Else 1989 Subaru Justy, 1986 Vauxhall Cartlton 2.0 GL, 1985 Vauxhall Carlton 2.2 CDi, 1987 Ford Sierra XR4x4, 1983 Vauxhall Senator, 1985 Vauxhall Senator 3.0i, 1997 Polo Saloon, 1997 Peugeot 306 1.9 TDi, Ford Sierra Sapphire 2000E, 1990 Subaru Justy, 2000 Subaru Impreza, 2000 Subaru Impreza RB5, 1993 Range Rover LSE, 2005 VW Bora, 2003 Skoda Superb, 2003 VW Passat V6 4 Motion, 1996 Peugeot 106, 2000 Range Rover 4.0, 2019 Tesla Model 3 Performance |
#5
|
||||
|
||||
I'm probably totally wrong here, but a few years back I had a car that had similar symptoms and it turned out to be a cracked torque converter plate
__________________
I Love the smell of petrol in the morning! Other vehicles 1968 Rover P5B Coupe (Modified & V-Quick, but I have to sell this now ... Boo Hoo!) '92 Mitsubishi Pajero V6 (Petrol) Super Exceed (Gone now) '06 Harley Davidson Night Train Oh Yes....... The '98 PF S8! |
#6
|
|||
|
|||
Update on how this "rattle" story ended.
Just an update on how this story ended.
After further driving it became very obvious that something the catalytic converter closest to engine made the rattling sound. The porcelain(?) inside of the cat was being crushed into smaller and smaller parts and would eventually clog the whole exhaust pipe. This would be a bad thing if engine was running at high RPM’s. An exhaust specialist used a simple detection method: Standing under the car (on lift) we looked at the Catalytic converter. It has two “chambers” where the mesh is located easily detectable from outside. He then simply tapped with his knuckle on the chambers and the difference in sound was obvious and identical to what to expect when tapping on a wall for finding cavities. It was impossible within my timeframe to go for aftermarked. Re-used was not an option as this is a very rare car in Norway. Probably less than 50facelift (of approx. 4 million cars in country) exist due to stupid taxation of engine size and power Unfortunately sourcing an original CAT from audi was close to impossible. The stealership claimed that there was no OEM NS cat anywhere in Europe and that a new one had to be made with a very long lead time. A local highly skilled Audi tuning specialist managed to source up a cat from Germany in two weeks and I had it changed. This was expensive, but I survived and can continue to enjoy the S8. So, there you have the full story. The CAT was the culprit. Thanks to all that helped me with advice in time of despair. Kind Regards Yggdrasil |
#7
|
||||
|
||||
A bit late now, I know, but I recently had 2 sports cats fitted to my 2002 S8 - much cheaper than from Audi and a few more BHP.
There are photos on here somewhere |
#8
|
|||
|
|||
Quote:
What did your sports cats cost as a pair? |
#9
|
||||
|
||||
IIRC around £400 for the pair fitted
|
#10
|
|||
|
|||
That's ideal. Did you go for 200 cell cat's? |
|
|