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      07-22-2018, 10:30 AM   #1
BBZ4MC
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Vibration above 7000 RPM in 3rd gear

I changed the oil and on a max acceleration run, I noticed a metallic vibration/rattle from the engine around 7000rpm, until red line. Almost like that sound from a CSL airbox when the valve opens, but it is a bit disconcerting because I've never noticed it before. I do believe the oil is a bit overfilled, so I will remove some today and check it out.

Any ideas?

(2007 Z4MC with almost 63k miles)

Thanks, Brian
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      07-23-2018, 02:02 AM   #2
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Many possibilities, impossible to tell without hearing it (video/audio).

Crazy but not really horrible possibilities:

A. Strut tower to firewall bolts are loose. There are two types. The older nut on fixed bolt needs locktite. There's a thread/post I did on this ages ago with torque specs.

B. Motor mount(s), mount bolt(s).

C. None of the above

Keep this thread updated as more info is gathered
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