E46 M52 engine clicking sound - Vanos?

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I've got a 1999 328i with about 115K miles on it. I've got an intermittent 'tapping' sound that comes and goes at idle. It doesn't really sound like the common VANOS issues I have found from others on Youtube. It is only apparent at idle, not in the 2000k RPM range others have described. I don't seem to have any loss of power anywhere on the power curve, so I'm a bit stumped.

I'm looking for some guidance - whether it seems more like a VANOS issue or a lifter issue or maybe something else I should be investigating....
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I have the same sound someone can help me?

stefanivanov