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      01-25-2020, 05:02 AM   #217
clausmoll
Private First Class
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Drives: 330i Touring M-sport
Join Date: Nov 2019
Location: DK

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Quote:
Originally Posted by XXXX View Post
No sound in the backseat
Sound even if you roll down a hill with the engine off
The sound changes with the speed
It seems that is coming from lower front. But the source could be anywhere, if the coupe/body is the resonance box. It could be the drive shaft bearing even if that is placed a bit back.
I'm afraid that the Touring model is a design failure and that it is a very sensitive resonance box and it picking up sounds that is hard to find.
That's a really interesting find - that the noise is still there with the engine shut off and in Neutral. The drive shaft is still rotating when in neutral and rolling - so it still could be the bearing.
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