440i exhaust rattle!!

Sam77 · 01-14-2019, 04:15 PM

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?

DarrenL_007 · 01-14-2019, 04:21 PM

Hi, I've definitely not noticed this on mine and usually start the car with the door open.

Sam77 · 01-14-2019, 04:23 PM

Quote:

Originally Posted by DarrenL_007

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??

DarrenL_007 · 01-14-2019, 04:31 PM

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.

Goneinsixtyseconds · 01-14-2019, 04:56 PM

Definitely something loose. Mine doesn't do that.

ian332isport · 01-14-2019, 05:48 PM

Rattley flap ?

RobG_M340 · 01-14-2019, 06:21 PM

Bought mine in April. Every now and then I get the same thing and it goes away once it gets warm.

cfm56d7b · 01-14-2019, 06:34 PM

When the rattle occur, did you by any chance notice whether the gas tank was full or closer to empty?

chris-c · 01-15-2019, 02:45 AM

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...

Goneinsixtyseconds · 01-15-2019, 02:47 AM

Ah, I unplugged mine and it's permanently open, maybe that's why it's never rattled on start up.

WTruter · 01-15-2019, 03:18 AM

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.

01-14-2019, 04:15 PM	#1
Sam77 Private First Class 43 Rep 136 Posts Drives: F36 420d Gran Coupe. Gone: E92 Join Date: Jul 2008 Location: Cheshire iTrader: (0)	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, 04:21 PM	#2
DarrenL_007 Lieutenant 209 Rep 542 Posts Drives: F36 430d xDrive M Sport GC Join Date: May 2015 Location: West Midlands iTrader: (0) Garage List 2015 BMW 430d xDriv ... [0.00]	Hi, I've definitely not noticed this on mine and usually start the car with the door open. __________________ 440i GC M Sport : Arrived 25th May 2018 Mineral Grey / Ivory White Dakota Leather / Reversing Camera / Folding/Auto Dipping Mirrors / Park Assist / Sun Protection Glass / Electric Glass Sunroof / Heated Steering Wheel / Icon Adaptive LED Headlights / 19" 704M Alloys / Digital Cockpit / Head-up Display / Wifi Hotspot / Driving Assistant / Speed Limit Display / Harmon Kardon Loudspeakers / High-Beam Assist / Enhanced Bluetooth - Wireless Charging / Online Entertainment / M Sport Brakes / Comfort Access / Extended Storage
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01-14-2019, 04:31 PM	#4
DarrenL_007 Lieutenant 209 Rep 542 Posts Drives: F36 430d xDrive M Sport GC Join Date: May 2015 Location: West Midlands iTrader: (0) Garage List 2015 BMW 430d xDriv ... [0.00]	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. __________________ 440i GC M Sport : Arrived 25th May 2018 Mineral Grey / Ivory White Dakota Leather / Reversing Camera / Folding/Auto Dipping Mirrors / Park Assist / Sun Protection Glass / Electric Glass Sunroof / Heated Steering Wheel / Icon Adaptive LED Headlights / 19" 704M Alloys / Digital Cockpit / Head-up Display / Wifi Hotspot / Driving Assistant / Speed Limit Display / Harmon Kardon Loudspeakers / High-Beam Assist / Enhanced Bluetooth - Wireless Charging / Online Entertainment / M Sport Brakes / Comfort Access / Extended Storage
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01-14-2019, 04:56 PM	#5
Goneinsixtyseconds Banned 4279 Rep 7,703 Posts Drives: Q7 & Clubman JCW on order Join Date: Dec 2016 Location: Chesterfield iTrader: (0)	Definitely something loose. Mine doesn't do that.
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01-14-2019, 05:48 PM	#6
ian332isport Major 705 Rep 1,141 Posts Drives: F31 340i Shadow Edition Join Date: Jun 2018 Location: UK iTrader: (0)	Rattley flap ?
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01-14-2019, 06:21 PM	#7
RobG_M340 Private First Class 53 Rep 152 Posts Drives: '21 M340xi Join Date: Jun 2010 Location: N. Miami Beach, FL iTrader: (0) Garage List 1973 Jeep CJ5 [0.00] 2021 BMW M340xi [0.00]	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, 06:34 PM	#8
cfm56d7b Lieutenant General 5876 Rep 10,249 Posts Drives: 2017 440i Gran Coupe & 2015 X5 Join Date: Nov 2012 Location: Orange County, CA iTrader: (2)	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, 02:45 AM	#9
chris-c Lieutenant Colonel 901 Rep 1,800 Posts Drives: F31 340i RWD Join Date: Feb 2018 Location: Kent iTrader: (0)	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, 02:47 AM	#10
Goneinsixtyseconds Banned 4279 Rep 7,703 Posts Drives: Q7 & Clubman JCW on order Join Date: Dec 2016 Location: Chesterfield iTrader: (0)	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, 03:18 AM	#11
WTruter First Lieutenant 101 Rep 322 Posts Drives: F30 340i W/MPPSK Join Date: Apr 2017 Location: South West Brisbane iTrader: (0)	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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