You might want to check/replace the foam-rubber seal around the air blower too (in the centre, behind the engine).
If that's perished (and I suspect most are by now if they haven't been replaced), the blower will be taking air in from the sides, bypassing the bonnet lid ducting and the pollen filters.
Edited to add ...
Here's HP's thread where he posted his fix for replacing the foam-rubber seal:
http://forum.a8parts.co.uk/showthread.php?t=9079&page=3
And my own fix, on the next page:
http://forum.a8parts.co.uk/showthread.php?t=9079&page=4
__________________
Mark
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2002 FE S8 Ebony Black Pearl
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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
Last edited by moltuae; 12th July 2019 at 08:30 PM.
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