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Hi ! Coming from my e91, n46 that had the exact same issues. May be a stupid question but are you sure the Vanos solenoids are in all the way? sometimes it is really hard to do so, i ended up using a hammer even though i am a big guy. You can try to take the o-ring off, see how much it should go in, and then put it back with the gasket
 

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Does the car throw any fault codes? When you checked the timing, or when you set it, did you checked that no intake nor exaust vanos is stuck ? You can check that by trying to turn the centre nut of the exaust left and right. If it has less than 1mm left-right movement, the vanos is working fine, but sometimes it can get stuck, so you set the timing correct but it throws it off/set it wrong because of this.

I would also check the crankshaft sensor too, or replace it. Whatever is more convenient. I know it s quite tricky to get to it
 
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