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I have a similar noise at 2500 rpm after a full engine rebuild, but I haven`t found out yet what`s causing it. One thing I tried to determine the bank where it`s coming from was that I disconnected the connector for the variocam solenoid on both sides one at a time, but the rattle didn`t change substantially either way. So I`m not sure actually if it`s related to the variocam. You can try this test on yours too, the connectors are easy to access even on the road. If I put the covers back on it`s barely audible. My cam deviations are fine, -3 and 0.
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