[Bullitt]

Originally Posted by 2swift

Any updates from you guys?

I just had my aftermarket exhaust taken off and my stock one put back on. Been noticing a metal rattle sound only during cold starts. It goes away after I start driving. Was it indeed just the exhaust flap for you guys?

Haven't gone to the dealer yet since it hasn't bothered me enough to take it in. I think it's from the wastegate area. It's definitely not the exhaust flap for me since it doesn't exist in the performance exhaust.

[2008montegoblue335i]

Ive had the same thing happening since my car was brand new. When you start the car, at the moment the car starts up, i get a quick rattle, sometimes it happends sometimes it doesn't. It also happends whether my car is cold or already warmed up. Doesnt ever rattle at any other time, just the 3 seconds or so when its starting.

[2008montegoblue335i]

ALSO, When i used to have my exhaust flap, as my motor was going through the warmup procedure i would get a quick clunk/rattle sound as the flap would open.

[ArmyBimmerDude]

Question - Driving yesterday with the windows and sunroof open, whenever i released the accelerator, i would here a rattling noise underneath the car. Anyone have any ideas what that would be?

[Mr. 5]

Originally Posted by ironic

it could be the direct injection, i get a very mechanical sound from the car even after being warmed up. you should youtube a video of a stock car and compare the sound with yours

I think that's what it is too.
This car has an initial start up procedure every time it's started.
The direct injection acts somewhat like a diesel and sounds a little louder than the regular engine.

[Everling]

i had some clinging noise at start up and stopping too. i took it to the dealership and they've had it for 5 days already... they are now keeping it over the weekend to work on it some more.

[gerardm]

Originally Posted by ArmyBimmerDude

Question - Driving yesterday with the windows and sunroof open, whenever i released the accelerator, i would here a rattling noise underneath the car. Anyone have any ideas what that would be?

wastegate

[ArmyBimmerDude]

Originally Posted by gerardm

wastegate

Yeah, the car was turned in and it has the latest progman, but I still hear the rattling every once in a while. Specifically the first couple minutes of driving, then it goes away the rest of the drive.

The update has done one thing I love. My exhaust sounds almost twice as loud and roars when I accelerate. So awesome.

[2swift]

my bmw dealership replaced my muffler but now even the new muffler is making the same sound! They claim there's nothing else they can do...BS.

[ArmyBimmerDude]

Originally Posted by 2swift

my bmw dealership replaced my muffler but now even the new muffler is making the same sound! They claim there's nothing else they can do...BS.

It is BS. Take them the SIB and show them what they need to do, thats what I did after they told me "BMW's make that noise as they get older". I'm thankful they accepted the paperwork I gave them(SIB) and immediately working to fix the problem. Love Taylor BMW.

[2swift]

Originally Posted by ArmyBimmerDude

It is BS. Take them the SIB and show them what they need to do, thats what I did after they told me "BMW's make that noise as they get older". I'm thankful they accepted the paperwork I gave them(SIB) and immediately working to fix the problem. Love Taylor BMW.

Thanks...I got that stupid "it's normal" response too. What SIB paperwork are you referring to?

[ArmyBimmerDude]

Originally Posted by 2swift

Thanks...I got that stupid "it's normal" response too. What SIB paperwork are you referring to?

Here you go. Print this link as well as the two picture i attached and take it to them. If they're professional, they'll look at it and see if this is the cause :

http://www.bmwtis.com/tsb/bulletins/...p/B111307g.htm

[2swift]

thanks for the paperwork. After reading through it though, yours refer to the metallic noise from the engine. I should have stated that my noise is coming from the exhaust flap.

[Bavaria330]

Originally Posted by ArmyBimmerDude

Question - Driving yesterday with the windows and sunroof open, whenever i released the accelerator, i would here a rattling noise underneath the car. Anyone have any ideas what that would be?

Mine is in the dealer for this same reason.. i had this problem with a 2007, but now is happening to a 2009. I thought this had been fixed

[Alan l.]

Mine does this from time to time. Rattles for 2-3 secs and goes away. Only during start up.

[pacmanchriz]

Originally Posted by Alan l.

Mine does this from time to time. Rattles for 2-3 secs and goes away. Only during start up.

What did you end up doing to getting this fixed? I'm experiencing Rattles for 2 seconds on cold starts and about 1 second during warm starts..

[autoart]

that was 12 years ago