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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions 330i vibration noises - exhaust heat shields?

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      11-03-2019, 01:19 AM   #1
nugz
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330i vibration noises - exhaust heat shields?

Hey guys,

There's a loud high-pitched vibration noise I'm hearing from the ?exhaust on cold starts. I've had my car for 2 months and it's done over 3,500km (bought as demo).

I took it to the dealer this week. The service advisor was quite shocked and had never heard it before. It picked it up yesterday with no noise, but it has returned this morning.

This is the job description record: "Carry out start up of the vehicle. No noise present at time of testing. The vehicle had been driven and was warm. Need to perform cold start. Carry out cold start and confirmed noise was coming from the vehicle. Lift vehicle up on the hoist and found the exhaust heat shields loose knocking on exhaust. Carry out refitment of the exhaust shields. Test multiple times all okay."

I've found very few comments on Bimmerpost regarding the same issue, but the thread was more about squeaking noises from the trunk seals.

Anyone else experiencing this? Appreciate your help.

Back to the dealership I go...
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      11-04-2019, 06:02 PM   #2
chris_portimaog20
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I have the noise issues
1. rattle noise from the center console > solution is to apply felt tape and sound gone
2. rattle noise from exhaust on cold start for 1-2 min, I'm pretty sure I saw another thread on this subject but if I remember correctly it is a normal noise from exhaust valve and changing muffler is the only definitive solution. someone correct me if I'm wrong
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      11-14-2019, 11:34 AM   #3
napekbezklapek
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Hi,
Chris could you tell me where exactly did you have center console noise? I have problem with this plastic behind center screen - it starts vibrating around 3k rpm.
Rattle noise during cold start in my opinion is normal as we have active exhaust system.
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      11-15-2019, 02:25 AM   #4
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Quote:
Originally Posted by napekbezklapek View Post
Hi,
Chris could you tell me where exactly did you have center console noise? I have problem with this plastic behind center screen - it starts vibrating around 3k rpm.
Rattle noise during cold start in my opinion is normal as we have active exhaust system.
Seems like center speaker rattle. There's a DIY thread on how to fix it by adding felt tape. Or you could take it in to the dealer and have them fix it.
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      01-21-2021, 09:18 PM   #5
JTYAMSHAYIN
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Does anyone have the vibration on cold starts? I do believe it's coming from the heat shields. Not really hearing it from in the cabin but I can when I'm outside the car
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      02-12-2021, 04:49 PM   #6
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Yes, my 19' 330i xdrive Sport line, 2/19 Munich build has a heat shield sounding cold start vibration for 1-2 minutes and goes away once the RPM's drop. I seemingly can get it to stop by immediately putting the vehicle in SPORT mode upon start, thus opening up the second exhaust pipe. Dealer told me it's normal..
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      02-12-2021, 09:38 PM   #7
VipinLJ
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Yup. Common issue. I believe the F30s had it too. Though I thought it was the valve and not the best shield that was vibrating.
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      02-12-2021, 10:39 PM   #8
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Quote:
Originally Posted by VipinLJ View Post
Yup. Common issue. I believe the F30s had it too. Though I thought it was the valve and not the best shield that was vibrating.
Yea the g20 sounds like the heat shield. My old f30 sounded like something more concerning and always had me nervous.
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      02-14-2021, 02:49 PM   #9
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had exactly this high pitch rattle annoying sound on cold start, and went away in 1 min.
Dont know exactly what it was, but i think dont have actuator on exhaust (engine model A).
If it still there for more than a day will go to dealer
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      02-15-2021, 07:18 PM   #10
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I also have had this noise ever since I got the car. It is a rattle noise that starts almost immediately after a cold start (sitting overnight) and for me goes away immediately once the engine reaches normal temp. It's extremely consistent (I now have 10k miles on the car).

I've just learned to deal with it. It's not really concerning. It goes away in 1-2 mins for me and never returns throughout the day. It only returns in the morning during a cold start.
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      02-15-2021, 09:14 PM   #11
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Quote:
Originally Posted by exhibhooligan View Post
I also have had this noise ever since I got the car. It is a rattle noise that starts almost immediately after a cold start (sitting overnight) and for me goes away immediately once the engine reaches normal temp. It's extremely consistent (I now have 10k miles on the car).

I've just learned to deal with it. It's not really concerning. It goes away in 1-2 mins for me and never returns throughout the day. It only returns in the morning during a cold start.
True. It's a good thing I can't hear it inside the car I just live with it.
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      02-16-2021, 02:14 AM   #12
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Quote:
Originally Posted by VipinLJ View Post
Quote:
Originally Posted by exhibhooligan View Post
I also have had this noise ever since I got the car. It is a rattle noise that starts almost immediately after a cold start (sitting overnight) and for me goes away immediately once the engine reaches normal temp. It's extremely consistent (I now have 10k miles on the car).

I've just learned to deal with it. It's not really concerning. It goes away in 1-2 mins for me and never returns throughout the day. It only returns in the morning during a cold start.
True. It's a good thing I can't hear it inside the car I just live with it.
Lucky! I unfortunately can hear it inside the car. It just sounds like a strange high pitched rattle sound usually corresponds to when I'm accelerating. But it's really not a huge deal since it goes away within 2 minutes of driving!
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      01-14-2022, 07:38 PM   #13
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Yeah same issue on cold starts. Goes away in a while. It happens because the exhaust is vibrating, I know that cuz it went away when I support the exhaust with my foot
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      01-16-2022, 07:11 AM   #14
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My 330i had a rattle from the rear end of the exhaust on cold start from new. Entire back end of system replaced under warranty.
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