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      11-13-2012, 02:12 AM   #1
julians999
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Drives: 2008 m3
Join Date: Nov 2012
Location: United Kingdom

Posts: 12
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rough idle, bad noises

Hi All,

My car has recently started making some bad sounding noises upon startup from cold. When you start it up, you get a banging/knocking noise for the first 30-60 seconds, then it quietens down and seems fine. During this period it seems less willing to rev.

It only does it when its been left for 8-12 hours, if you start it up after say 3-4 hours of being sat it starts fine with no noises.

There are no warning/lights on the dashboard, and it seems to drive ok once you get past this stage.

See end of post for a you tube video, you'll have to turn the volume up because my phone didnt capture the sound very well.

I've got a few ideas of what it could be , but would appreciate any ideas you may have.

Car is a 2008 m3 with 37000miles, and is totally stock, no modifications at all.


Last edited by julians999; 11-13-2012 at 02:19 AM.
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