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Heavy vibration
So our 08 X3 has a vibration under acceleration that is getting progressively worse. It starts around 20 mph and by 70 it’s pretty much undriveable. Sometimes though when coasting it gets temporarily better.
I’ve changed the engine mounts, center carrier bearing, and guibo. I don’t think it’s a bad tire/wheel because sometimes it improves with foot off the gas. Both front axles have good rubber covers on both ends; I can’t feel any play in them; and there is not any clicking on cornering. I’ve heard speculation about coils and plugs but they are all about a year old and the engine seems to run fine with no codes showing.
I’m stumped. Any experience-based thoughts?
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08 X3
05 X3
91 535i
86 R65
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