Just a quick update.
I still haven't figured out what the sound/issue is but have probably eliminated the suspension pump. The sound is coming from the very back of the engine, the right (N/S) bank only.
For those of you who have experienced BMW Vanos 'buzz', it reminds me of that. Very intermittent and quite hard to induce but results in an annoying sound! Worse immediately upon start up, hot or cold.
Having looked at the V10 engine tech doc I am thinking it could be chain tensioner related.... My AC also refuses to switch on, could they be related I wonder.
Anyway my quest continues....until the inevitable trip to a spanner expert.
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'09 D3 S8 - Most of the bells and whistles (B&O, Audi Exclusive brown interior and exterior paint, soft close, ACC etc) de-flapped manifold!
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