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      01-14-2019, 05:15 PM   #1
Sam77
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Hi all

Picked up my new 440i GC in December. Nice Christmas present and quite a step up from my old 420d!!

Started it up this morning and then jumped out to adjust my daughters seat, the exhaust sounds like there's a bag of nails in there!!! Dies off when it gets warm. Anyone else had this?
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      01-14-2019, 05:21 PM   #2
DarrenL_007
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Hi, I've definitely not noticed this on mine and usually start the car with the door open.
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440i GC M Sport : Arrived 25th May 2018

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      01-14-2019, 05:23 PM   #3
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Quote:
Originally Posted by DarrenL_007 View Post
Hi, I've definitely not noticed this on mine and usually start the car with the door open.
Thanks, I've added a YouTube video but the sound doesn't work when embedded into the app? Any ideas??
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      01-14-2019, 05:31 PM   #4
DarrenL_007
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Just had a listen to the clip and it sounds like something is loose.

I will try and upload a clip of my cold start in the morning to compare.
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440i GC M Sport : Arrived 25th May 2018

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      01-14-2019, 05:56 PM   #5
Goneinsixtyseconds
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Definitely something loose. Mine doesn't do that.
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      01-14-2019, 06:48 PM   #6
ian332isport
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Rattley flap ?
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      01-14-2019, 07:21 PM   #7
robg_f36
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Bought mine in April. Every now and then I get the same thing and it goes away once it gets warm.
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      01-14-2019, 07:34 PM   #8
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When the rattle occur, did you by any chance notice whether the gas tank was full or closer to empty?
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      01-15-2019, 03:45 AM   #9
chris-c
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Its the flap rattling. This is common as muck.
The M140/240i's ended up getting a new exhaust system to rectify it.

My 340i had a new exhaust within its first 12 months and I needed a new rear section another 12 months later.

my car....


A few others...






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      01-15-2019, 03:47 AM   #10
Goneinsixtyseconds
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Ah, I unplugged mine and it's permanently open, maybe that's why it's never rattled on start up.
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      01-15-2019, 04:18 AM   #11
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I had a similar rattle on mine. Took to BMW and they confirmed valve on rear needed replacing, which would be a new back box. I negotiated and got good discount on the MPPSK instead.

But worth taking to BMW for a fix. Believe the valves are known of working lose.
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