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Old 9th December 2019, 08:40 AM
moltuae's Avatar
moltuae moltuae is offline
RIP 27/02/2021 :-(
Join Date: Sep 2014
Location: East Lancs.
Posts: 2,679

I had a similar issue some years ago. IIRC, in my case it started just after I'd had a set of new tyres fitted (on newly refurbished wheels). There was an intermittent vibration, which seemed to come from the rear. It would usually happen after hard acceleration, typically just after joining a motorway. The vibration was severe enough that I pulled over onto the hard shoulder the first couple of times it happened, expecting to see a wheel falling off or a bulge in one of the tyres, but I could see nothing wrong. I gingerly proceeded and the vibration was gone, until the next time I stomped on the accelerator.

I wondered if one of the rear wheels might be slightly bent so I spoke to the wheel refurbishers about it. They told me that they check all the wheels 'run true' before refurbishing so this was unlikely and suggested that I have the alignment checked. So I had my usual garage check the car over and perform a 4-wheel laser alignment, which seemed to make a big difference. They also noted though that some of the rear subframe bushes were pretty knackered. Several months later I had the rear subframe replaced and all the bushes renewed. I'm not sure if the cause was worn bushes, alignment or a combination of both, but the problem has never returned and, following the subframe replacement, the car now feels much more 'planted' when corning.
2002 FE S8 Ebony Black Pearl

Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)

The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
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