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| D2 - Axles, Brakes, Suspension and Steering Brakes, Springs, shocks, steering racks, steering columns, suspension arms, wheel hubs etc. |
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#1
27th February 2010, 12:23 PM
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Knocking/Rumbling when turning left - any ideas?
I am getting a knocking/rumble which I can feel coming through the floor when I turn left or change lane toward the left from the O/S wheel area
I've changed the CV joint (CV boot was split) - no change. Changed the track rod ends - they were worn but its not fixed it. levered all the ball joints in sight to see if they're slack or have wear on them. I've put the wheel back on the hub without drive shaft or caliper fitted and cannot feel any play, rumble or anything wrong with the wheel bearing, it will spin away for 5 mins after spinning it up by hand. I get the feeling there is something wrong with the subframe or lower control arms where they join the car under your feet while driving - any body got any ideas?
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D2 2.8 Sport ('98 110,000miles and counting) 
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#2
27th February 2010, 01:25 PM
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You seem to have checked everthing I can think of. Have you checked the subframe bolts and inner control arm bolts are tight?
After that all I can think of is tracking / trackrod ends..... 
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light. 
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#3
27th February 2010, 02:10 PM
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I haven't actually checked the subframe bolts - will do that tomorrow.
Are they the three or four straight into the car floor around the mounting plate? I removed the rearward bottom link arm to subframe at the ball joint on hub and it seems to be firm at the subframe end. The forward link arm however can be moved laterally along its bolt - I reckon the rubber bush should be bonded on to the bolt through the subframe? Perhaps this is what is giving me the grief? BTW I hate nounting new CV boots - the damned clips never stay on no matter how much degreasing of the inner lip of the boot and OD of CV joint you try. This is even an OEM clip, brand new.......
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D2 2.8 Sport ('98 110,000miles and counting)
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#4
28th February 2010, 09:36 AM
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Looks like you have found your culprit.
 The forward connecting arm should have no movement at all. Remember the bolt should be tighted when full weight is on the suspension. The bush is bonded into the control arm and when the bolt is tight there should be no movement. There are 4 bolts on the subframe and a further 3 each side on the rear mounting point plate.
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light.
Last edited by Conan_the_Librarian; 5th March 2010 at 06:08 PM.
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#5
28th February 2010, 12:55 PM
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Update - what I thought was movement turned out to be just stretch on the bush of the track control arm.
Everything is tight under there and no slack on any ball joint. Am I right thinking that a rumble/knocking felt through the floor is unlinkely to be a bearing? It is whisper quiet on the straight and a gentle low speed curve but any uneveness of the road surface or push it a little faster gets this noise. Oh yeah also found out that the the ABS sensor is stuck fast - probably going to destroy that getting it out 
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D2 2.8 Sport ('98 110,000miles and counting)
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#7
28th February 2010, 07:10 PM
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Wheel bearing would have been high on my list, even if it feels good by hand.... half a ton exerts way more force than your hands, and when turning there are additional sideway forces...
Are the wheels all balanced and true - an unbalaced wheel can stress the bearings / joints too...
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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 783537The 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
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#8
5th March 2010, 06:05 PM
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Wheels are perfect (ran a clock on them while it was up on jacks) balanced two weeks ago with new tyres (noise was there before new tyres).
I'm going to have a go at changing the bearing tomorrow anyhoo - I've bought it so I might as well use it.
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D2 2.8 Sport ('98 110,000miles and counting)
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#9
7th March 2010, 11:25 AM
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So, update
After spending the best part of 9 hours getting the bearing housing out of the car and changing the bearing (including drilling out the upper pinch bolt) its made no difference at all to the rumble. I'm getting really fed up with this car now and the annoying thing is its a good car otherwise. Anybody fancy a 2.8 sport at a knockdown price?
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D2 2.8 Sport ('98 110,000miles and counting)
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#10
29th March 2010, 07:41 AM
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So I've found the problem causing the knocking/rumbling noise - it was the exhaust
I had replaced the two joining couplings just after the cats some time ago and the O/S pipe had relaxed over time and was too close to the heatshield, about 1/2" away. When cornering etc the engine moved just enough to allow a small bolt sticking out of the zorst to knock the body.
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D2 2.8 Sport ('98 110,000miles and counting)
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