I have apart a dual vanos unit, trying to figure out how it works exactly and if it is missing any parts. What confuses me is that the intake side has a spring in it, but the exhaust doesn't. Maybe someone here that better understands the M52TU / M54 engine could explain to me if it is missing parts or not. When assembled, the side without the spring feels more like the the single vanos units I have, in that it actually moves.
Any takers?
Any takers?

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