Slight Metallic rattle on startup?

MSully96 · 08-17-2017, 11:19 AM

Just posting this just as a precaution. Bought my car last Thursday, 2013 e92 335is 30k miles. When I start up the car I hear a metallic-like rattle that immediately goes away after like a second. The car is completely stock. Is this an issue/going to cause any issues? The car drives perfectly fine its just something I noticed and wanted input on to be safe.

Omni159 · 08-17-2017, 01:31 PM

do the n55 use the same cold start noise reduction as the n54. If so its probably the exhaust flap

MSully96 · 08-17-2017, 02:45 PM

Quote:

Originally Posted by Omni159

do the n55 use the same cold start noise reduction as the n54. If so its probably the exhaust flap

That was my first thought, maybe its the exhaust flap resetting/initializing or whatever.

CoffeeBean · 08-17-2017, 03:23 PM

He has a 335is so it has the N54. That metallic sound is most likely the exhaust flap closing. You can leave it open by doing the "golf tee" mod which means just unplug the vacuum hose on it and plug it with a golf tee.

MSully96 · 08-17-2017, 04:36 PM

Quote:

Originally Posted by CoffeeBean

He has a 335is so it has the N54. That metallic sound is most likely the exhaust flap closing. You can leave it open by doing the "golf tee" mod which means just unplug the vacuum hose on it and plug it with a golf tee.

Thanks man, makes me feel a lot better and not worry lol.

CoffeeBean · 08-17-2017, 07:57 PM

Quote:

Originally Posted by MSully96

Thanks man, makes me feel a lot better and not worry lol.

No problem. Saw your other thread - beautiful car, enjoy it.

JustDriveIt · 08-18-2017, 08:47 AM

It's the exhaust flap, you can unplug the solenoid by the left tail light which will prevent it from shutting or just leave it be and know it's nothing to worry about.

mxchris727 · 08-18-2017, 11:10 AM

I have the same rattle. Super annoying especially considering that I had the exhaust replaced under warranty for the same issue a few years ago. I secured an airplane clamp around the valve to add tension to it; and it doesn't make a sound anymore yet still operates correctly.

Omni159 · 08-18-2017, 11:13 AM

Quote:

Originally Posted by mxchris727

I have the same rattle. Super annoying especially considering that I had the exhaust replaced under warranty for the same issue a few years ago. I secured an airplane clamp around the valve to add tension to it; and it doesn't make a sound anymore yet still operates correctly.

Great idea for a fix!!! If mine ever acts up il be going this route.

MSully96 · 08-18-2017, 10:45 PM

Just going to wait until I get JB4 and keep the flap open all the time. Hopefully that works.

MSully96 · 08-24-2017, 06:16 PM

Quote:

Originally Posted by JustDriveIt

It's the exhaust flap, you can unplug the solenoid by the left tail light which will prevent it from shutting or just leave it be and know it's nothing to worry about.

In the trunk by the tail light or? Could I get a pic? Thanks.

EDIT: Just did research and found it. Thanks anyways!

MSully96 · 08-26-2017, 07:50 PM

Quote:

Originally Posted by mxchris727

I have the same rattle. Super annoying especially considering that I had the exhaust replaced under warranty for the same issue a few years ago. I secured an airplane clamp around the valve to add tension to it; and it doesn't make a sound anymore yet still operates correctly.

Is there any way you would be able to send me some pics of how you did this?

bimmerlove335 · 08-28-2017, 07:23 PM

Could be a wastegate rattling!

Jaronbwall · 08-29-2017, 07:26 AM

Quote:

Originally Posted by bimmerlove335

Could be a wastegate rattling!

Hahaha waste gate rattle comes from under the hood. Nobody likes talking about that.

bimmerlove335 · 08-29-2017, 11:03 AM

Quote:

Originally Posted by Jarronbwall

Hahaha waste gate rattle comes from under the hood. Nobody likes talking about that.

Lol. Fair enough.

08-17-2017, 11:19 AM	#1
MSully96 Private First Class 25 Rep 119 Posts Drives: 2013 335is M6 Coupe Join Date: Jul 2017 Location: MD iTrader: (0)	Slight Metallic rattle on startup? Just posting this just as a precaution. Bought my car last Thursday, 2013 e92 335is 30k miles. When I start up the car I hear a metallic-like rattle that immediately goes away after like a second. The car is completely stock. Is this an issue/going to cause any issues? The car drives perfectly fine its just something I noticed and wanted input on to be safe.
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08-17-2017, 01:31 PM	#2
Omni159 New Member 0 Rep 10 Posts Drives: 08 335i vert Join Date: Jun 2017 Location: Arizona iTrader: (0)	do the n55 use the same cold start noise reduction as the n54. If so its probably the exhaust flap
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08-17-2017, 03:23 PM	#4
CoffeeBean Lieutenant 226 Rep 554 Posts Drives: 640i M-Sport GC Join Date: Aug 2012 Location: AL iTrader: (2)	He has a 335is so it has the N54. That metallic sound is most likely the exhaust flap closing. You can leave it open by doing the "golf tee" mod which means just unplug the vacuum hose on it and plug it with a golf tee.
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08-18-2017, 08:47 AM	#7
JustDriveIt Lieutenant 236 Rep 358 Posts Drives: 2007 BMW 335i Coupe E92 Black Join Date: Dec 2015 Location: US iTrader: (0)	It's the exhaust flap, you can unplug the solenoid by the left tail light which will prevent it from shutting or just leave it be and know it's nothing to worry about.
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08-18-2017, 11:10 AM	#8
mxchris727 Captain 194 Rep 666 Posts Drives: '03 M5, '06 325i, '12 M3 Join Date: Aug 2012 Location: Westport, CT iTrader: (0)	I have the same rattle. Super annoying especially considering that I had the exhaust replaced under warranty for the same issue a few years ago. I secured an airplane clamp around the valve to add tension to it; and it doesn't make a sound anymore yet still operates correctly. __________________ BMW GT1 (INPA, DIS, WinKFP, ect..), ISTA/P & /D is up and running! PM me if you want to stop by and code your car.
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08-18-2017, 10:45 PM	#10
MSully96 Private First Class 25 Rep 119 Posts Drives: 2013 335is M6 Coupe Join Date: Jul 2017 Location: MD iTrader: (0)	Just going to wait until I get JB4 and keep the flap open all the time. Hopefully that works.
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08-28-2017, 07:23 PM	#13
bimmerlove335 Private 52 Rep 82 Posts Drives: Black '09 335i Join Date: Apr 2017 Location: PNW iTrader: (1)	Could be a wastegate rattling!
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