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D3 - Axles, Brakes, Suspension and Steering Brakes, Springs, shocks, steering racks, steering columns, suspension arms, wheel hubs etc. |
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#1
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Knocking front end on rough roads.
Hi folks, can anyone advise how to check the front driveshafts / CV joints for wear tolerances? I’ve had a mysterious knock coming from the front of the car and it’s only getting worse over time. I’ve replaced virtually everything and thinking it must be axles or ??
I’ve got nothing left to replace except the steering rack or front axles however, when I replaced all the inner and outer tie rods the rack shaft and mounting bolts are tight with no play, I even tightened the rack tolerance adjustment which tightened up the steering slightly but there was no steering play anyway… All front suspension arms, tie rods, steering rack bolts checked, stabiliser bar with drop links replaced, both front air struts - all replaced with NEW parts in an attempt to get rid of this illusive knock. It’s only heard on rough road services and not there at all on smooth roads. The steering is precise and no noticeable play. As an example It totally sounds Like a loud clunking noise similar to a strut knock or top shock mount knock if it was a typical car. I’m at my wits end with this car and this issue, any guidance or anyones past experience on something similar is most appreciated.
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Present cars Daily driver: BMW e65 730d Batmobile: 2006 S8, D3, 4E 5.2L V10 BSM with (loud) Miltek SS exhaust, Carbon Fibre trim, Alcantara headlining, soft close and keyless entry. |
#2
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I've read multiple posts from people having this same knocking issue and they seem to have replaced everything to no avail. Two specific things that are mentioned are the ARB bushes and the 42mm inside the front strut.
You mention about replacing the stabiliser bar so that would rule that one out. That leaves the strut itself. The nut in question is under the grommet marked as #4 in the attached image, with the comments being that it may have worked loose. Having replaced everything else, it's worth investigating.
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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 |
#3
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Quote:
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Present cars Daily driver: BMW e65 730d Batmobile: 2006 S8, D3, 4E 5.2L V10 BSM with (loud) Miltek SS exhaust, Carbon Fibre trim, Alcantara headlining, soft close and keyless entry. |
#4
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After yesterday's 300klm journey by car also developed a knocking noise when the wheel was turned. I think this unloaded and reloaded the sway bar and therefore the end links.
I am going to investigate this tonight. I have replaced the sway bar bushes, so I will making sure they are in the right spot and havent slipped. A good idea is to eliminate the sway bar by unbolting it, and taking the car for a drive. If the knock is gone, you have narrowed your items.
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04 A8 - 4.2 Sport Indigo Leather Sports Seats - Sports wheel - Sports Air Suspension Auto Boot - Double Glazing - AMI - Solar roof TV - Bose - Voice Control - TPMS - AFS- TINT Power Blind, Fingerprint - Light package (in and out) Retrofits: OEM Auto headlights & rain sensing wipers OEM Bluetooth phone Bluetooth Audio Streaming Reverse Camera OEM Aluminium Package Auto boot close using remote/door button |
#5
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I have replaced the complete ARB / anti-sway bar along with drop links in my quest to finding this noise. Cheers,
__________________
Present cars Daily driver: BMW e65 730d Batmobile: 2006 S8, D3, 4E 5.2L V10 BSM with (loud) Miltek SS exhaust, Carbon Fibre trim, Alcantara headlining, soft close and keyless entry. |
#6
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We're running out of things to check. Looking at an image of the suspension, you seem to have worked on almost every single nut and bolt. Grasping at straws here, but any likelihood that the bolt (#2 in the attached image) could be loose?
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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 |
#7
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I literally removed the sway bar and the noise went away. I put it back in and retorqued the bolts and it is fine now. I may have to use some thread locker. Mike
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04 A8 - 4.2 Sport Indigo Leather Sports Seats - Sports wheel - Sports Air Suspension Auto Boot - Double Glazing - AMI - Solar roof TV - Bose - Voice Control - TPMS - AFS- TINT Power Blind, Fingerprint - Light package (in and out) Retrofits: OEM Auto headlights & rain sensing wipers OEM Bluetooth phone Bluetooth Audio Streaming Reverse Camera OEM Aluminium Package Auto boot close using remote/door button |
#8
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Quote:
Cheers
__________________
Present cars Daily driver: BMW e65 730d Batmobile: 2006 S8, D3, 4E 5.2L V10 BSM with (loud) Miltek SS exhaust, Carbon Fibre trim, Alcantara headlining, soft close and keyless entry. |
#9
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Quote:
Cheers,
__________________
Present cars Daily driver: BMW e65 730d Batmobile: 2006 S8, D3, 4E 5.2L V10 BSM with (loud) Miltek SS exhaust, Carbon Fibre trim, Alcantara headlining, soft close and keyless entry. |
#10
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40nm +90degrees
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04 A8 - 4.2 Sport Indigo Leather Sports Seats - Sports wheel - Sports Air Suspension Auto Boot - Double Glazing - AMI - Solar roof TV - Bose - Voice Control - TPMS - AFS- TINT Power Blind, Fingerprint - Light package (in and out) Retrofits: OEM Auto headlights & rain sensing wipers OEM Bluetooth phone Bluetooth Audio Streaming Reverse Camera OEM Aluminium Package Auto boot close using remote/door button |
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