Did you replace the tensioners with genuine units or just change the pads? The right hand (bank 1) tensioner fails when it eats the filter gauze which then jams the cold start pin. The cold start rattle is the driver's side cam jumping about until the oil pressure is enough to tension the chain. Failure in the bank 2 tensioner is rare I think - of the engines I've dismantled, they are usually ok.
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