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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > 335i Start Up Rattle in Rear Drivers-Side Exhaust... Normal?
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      11-10-2012, 01:55 PM   #1
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335i Start Up Rattle in Rear Drivers-Side Exhaust... Normal?

Yesterday, I started my car w/ the door still opened, and I heard for the first time (assuming, because the door was open) a rattle coming from the drivers-side rear exhaust. I had someone listen to see where it was coming from, and it appears to be the damper inside the exhaust (which closes on start up), but seems as though it is rattling inside the exhaust as it closes. The rattle is only for a second and stops, but doesn't sound very good.

Can others w/ a 335 try starting their car (w/ the door open) and listen to see if their cars are making this noise as well. Trying to figure out if that's just the way the car is, or whether I have something loose (fyi - I don't hear anything when starting the car in the cabin w/ the doors closed).

Would appreciate perspectives.
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      11-10-2012, 02:06 PM   #2
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Yes I have this. I think it's normal.
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      11-10-2012, 02:10 PM   #3
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Right side exhaust is the only one open when you first start up...at least for me, on a cold day.
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      11-10-2012, 02:10 PM   #4
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Quote:
Originally Posted by Carnook View Post
Yes I have this. I think it's normal.
Great - thanks. Sounds like an old muffler ... wish they could have designed this differently. Doesn't sound great.
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      11-10-2012, 02:29 PM   #5
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Quote:
Originally Posted by shivaswrath View Post
Right side exhaust is the only one open when you first start up...at least for me, on a cold day.
Yes - only right one is open. The left one is closed on start-up (for first 20 seconds or so). The damper on the left (which closes on start-up) is the one that makes a rattling sound. Do you have this too?
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      11-10-2012, 03:59 PM   #6
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Quote:
Originally Posted by martinf79 View Post
Yes - only right one is open. The left one is closed on start-up (for first 20 seconds or so). The damper on the left (which closes on start-up) is the one that makes a rattling sound. Do you have this too?
I have the M sport exhaust, so never had this problem. Sounds annoying though...
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      11-10-2012, 04:17 PM   #7
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Quote:
Originally Posted by shivaswrath
I have the M sport exhaust, so never had this problem. Sounds annoying though...
It's personal preference. I kind of like it because its rough and a bit old school. Overall I wish the 335i sport had a bit more exhaust note so maybe that's why I like it. It sounds like a real car :-)
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      11-11-2012, 12:16 AM   #8
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just noticed it on mine last week, but goes away after a little. i think its just the exhaust gate closing.
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