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      10-22-2019, 01:19 PM   #1
stowboy
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Strange buzzing on cold start only??

Hi all
Only had my new M5 for 2 weeks, 1st week was fine, then all of a sudden on cold starts as soon as it fires up i have strange loudish buzzing noise that goes after a few seconds, then off...its been back to dealer who says its normal? never did it 1st week...i know its got lots of gizmos that power up but is after its fired...


Also on cold start it revs straight to 2k...is that normal?

cheers
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      10-23-2019, 02:51 AM   #2
JOHNBMWM5
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Reving too 2K cold is normal, Cats need heating up.
Buzzing !! never heard that.
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      10-25-2019, 04:32 AM   #3
stowboy
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thanks for reply, yes its odd, when i asked dealer they said all M5's do it...

May try to record it or see if its same outside car...

Already had a couple of other problems, lets hope its not a friday afternoon car.
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      10-25-2019, 09:38 AM   #4
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Quote:
Originally Posted by stowboy View Post
thanks for reply, yes its odd, when i asked dealer they said all M5's do it...

May try to record it or see if its same outside car...

Already had a couple of other problems, lets hope its not a friday afternoon car.
I've had two F90 M5's both with no problems at all, hope you get it sorted.
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      10-25-2019, 03:54 PM   #5
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could be a rattling exhaust valve on cold start. mine did this very slightly.
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      10-26-2019, 09:37 AM   #6
stowboy
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I see on the main forum a few other owners have it...

https://f90.bimmerpost.com/forums/sh....php?t=1663117

Some are saying it may be to do with new emissions system?

https://f90.bimmerpost.com/forums/sh....php?t=1660883
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