Do you notice a difference between idling in drive and neutral? The fan belt tensioner can be the cause of some rattles. My fan belt tensioner rattles when idling in drive. The rattle goes away when idling in neutral or when the rpm is increased slightly.

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Riadh
'89 560SL Rauchsilber
And what is good, Phaedrus, and what is not good -- Need we ask anyone to tell us these things?