What you are hearing is the cam phasers rattling back and forth until they refill with oil. Toyota addressed this issue with the locking pins for the newer dual VVT-i motors. They hold the phasers in a fixed position until there is enough oil pressure to release the pins. When the engine is running those empty areas between the lobes are full of oil. The question is why are they not holding oil like they used to? Unless they find a way to retrofit the auto locking phasers into the single VVT-i motors, the issue will just return IMO. Good luck, and keep us posted!
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