Anytime the vanos solenoids are taken out/replaced, a special 'oil reset' procedure must be performed. I recon this is the issue, but who knows. You can try the E70 board, I posted there about it.
These N62's are a little bit quirky.

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2003 4.6, esotril blue, over 215,000KM. Every previous owner failed to keep up the vehicle maintenance. Restoration project.