The Foxwell I have will only allow the idle to be raised by a small amount, and it made no difference in the shaking at idle. I've changed the idle control valve, motor mounts, transmission, transmission mount, and CV axles. The Vanos is original and now 23 years old so I wonder if it is the culprit.

This seems to be problem particularly affecting the X5 with the M54 engine, and not so much other models with that motor. Maybe is has something to do with the fact it is 4 wheel drive.

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Mark
2001 3.0 Original Owner, still going
2012 E70 xDrive 35i Pre-Owned -- sold because no one could figure out the transmission problem