Strange noise and vibration.

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
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ChrisA
4th Gear
Posts: 797
Joined: Thu May 07, 2020 11:28 am
Location: Langstone, nr. Portsmouth

Strange noise and vibration.

Post by ChrisA » Sat Apr 19, 2025 10:46 am

Morning guys

Can you please diagnose a fault with me.

After I got the car back from it being off the road for 3 years, there’s an odd fluttering noise and very slight vibration that kicks in at 40mph, and goes onto a whine as the speed increases, from the front axel. At 40mph it sounds a bit like when you wind the window down and you get a wind buffering. My first thought was a loose under tray. Then someone suggested that it might be the new poly bushes I put in after they had experienced the same thing, but I only did the rear end.

I’m 80% sure that slight vibration and sound is related to a failing wheel baring on the front axel, especially as when I turn to the left at 40mph the noise quietens a little (but not when turning to the right). What gives me the 20% of doubt is that if I left off the accelerator the noise reduces. 😬

The other issue I have is that when I select a gear occasionally I get a clunk. I did replace the gearbox oil some 1k miles ago, but this was just before the car went off the road, but will change it again to see if it helps.

With the wheels being off the car and the hub being exposed to the elements for three years it kind of makes sense to me, but what do you think?

What do you think?

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Shoppinit
Cruising
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Joined: Wed Dec 31, 2008 6:24 pm

Re: Strange noise and vibration.

Post by Shoppinit » Sat Apr 19, 2025 1:15 pm

What you describe sounds like it could be an inner CV joint. Or possibly a diff bearing. On one side it's easy to replace and on the other it's a 'mare. You can check for play on the drive shafts.

Did you notice any oil leaks while the car was standing? You might want to check the oil levels in the diffs.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

ChrisA
4th Gear
Posts: 797
Joined: Thu May 07, 2020 11:28 am
Location: Langstone, nr. Portsmouth

Re: Strange noise and vibration.

Post by ChrisA » Sat Apr 19, 2025 2:49 pm

Thanks. I’ll get it to the garage and put it to them. 👍

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