Question about 2001 BMW Z3

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Z3 whirring sound when transmission is engaged

I just noticed that there is a faint whirring sound when the transmission is engaged kinda like a superchargerish sound that is, and whenever i disengage the transmission to neutral, the whirring sound goes away. BTW, my tranny is an A/T.

many thanks!

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  • aviddante Mar 09, 2009

    hi technicaltec,

    yes, and it is within the required level.

    I am thinking that it could be coming from the differential as the sound is coming from the back area or beneath my seat.

  • aviddante May 11, 2010

    thanks for your reply!

    I am quite sure that when you shift to neutral, the sound disappears.

    what do you concur? where shall i start fixing?

  • greg benton May 11, 2010

    Have you checked the transmission fluid level?


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It is possible that your differential could be making the sound. However, if the sound disappears when putting the trans in neutral, I would suspect that the differential should still be making noise. If the torque converter is worn, then you would have noise while in gear, but probably not as noticeable while in neutral. Depending on the production date of your car, 2000-early2001 Z3 had an issue with the torque converters.

Posted on Mar 15, 2009

  • greg benton Mar 17, 2009

    Are you going to be doing the repairs yourself? If you feel comfortable that the noise is isolated to the transmission. I would recommend removing the transmission and pulling out and inspecting the torque converter.When inspecting the torque converter, look at the sliding surface of the converter that goes into the pump and check for signs of scoring (.ie grooves on the surface). Also, check the condition of the fluid to see if it is badly contaminated or burned. If the converter is ok, I would suspect a faulty converter housing with oil pump. If the converter is scored, you will need to replace both. Again I am recommending the repairs based on my experience with these transmission concerns, and encourage you to get a second opinion unless you are a technician or are going to perform the repairs yourself. One last recommendation is to inspect the driveshaft center support bearing while the driveshaft is exposed, and make sure it is not tearing.


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