Not the purge valve, I can hear that as a separate sound. I get a rattling when cold from the manifold area which seems to quieten down when warmer but it's still there and increases with revs, but I am noticing a louder fast ticking when the green lights are on/vis working (from vis indicator) so I am thinking that it may well be them.
I am going to shove some wynns stuff in to see if that quietens things when cold, which I think is either the manifold or noisy tappets, but I think the fast ticking under acceleration is vis related.
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