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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions 330i low rpm acceleration rattle noise

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      09-28-2020, 09:21 PM   #1
TorBimmer
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330i low rpm acceleration rattle noise

I have a 2020 330ix with just over 2000km on it. Recently, I've noticed a weird intermittent rattle noise between 1500rpm and 2000rpm when lightly accelerating. Seems to be coming from the front right of the engine bay.

Here's a video of it. It occurs at 4 seconds - right when the engine hits 2k rpm and upshifts.


Couple more points:
  • Intermittent - Doesn't happen with every light acceleration from 1.5k rpm to 2k rpm
  • No noise with medium or hard acceleration
  • No noise above 2k rpm
  • Only audible with the windows down
  • Doesn't occur when revving the engine in neutral
  • Way louder when the engine is cold, and gets quieter when warmed up
  • Car otherwise feels normal

The video makes it sound more like a whoosh, but I can attest on cold days with a cold engine that's it's like a metallic buzzing noise from the front of the car.

Anyone have any idea what this could be? Wastegate rattle? Exhaust leak/rattle?
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      05-06-2021, 07:07 AM   #2
erawamai
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Drives: BMW 330i G21
Join Date: Nov 2005
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Quote:
Originally Posted by TorBimmer View Post
I have a 2020 330ix with just over 2000km on it. Recently, I've noticed a weird intermittent rattle noise between 1500rpm and 2000rpm when lightly accelerating. Seems to be coming from the front right of the engine bay.

Here's a video of it. It occurs at 4 seconds - right when the engine hits 2k rpm and upshifts.


Couple more points:
  • Intermittent - Doesn't happen with every light acceleration from 1.5k rpm to 2k rpm
  • No noise with medium or hard acceleration
  • No noise above 2k rpm
  • Only audible with the windows down
  • Doesn't occur when revving the engine in neutral
  • Way louder when the engine is cold, and gets quieter when warmed up
  • Car otherwise feels normal

The video makes it sound more like a whoosh, but I can attest on cold days with a cold engine that's it's like a metallic buzzing noise from the front of the car.

Anyone have any idea what this could be? Wastegate rattle? Exhaust leak/rattle?
I'm pretty sure its some metal shielding shimmering either in the back or in the engine bay.
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      03-08-2024, 03:21 PM   #3
MAKH 5
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Drives: 2020 M340i RWD [Portimao Blue]
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Quote:
Originally Posted by TorBimmer View Post
I have a 2020 330ix with just over 2000km on it. Recently, I've noticed a weird intermittent rattle noise between 1500rpm and 2000rpm when lightly accelerating. Seems to be coming from the front right of the engine bay.

Here's a video of it. It occurs at 4 seconds - right when the engine hits 2k rpm and upshifts. https://www.youtube.com/watch?v=ttEO3GpJkHw

Couple more points:

Intermittent - Doesn't happen with every light acceleration from 1.5k rpm to 2k rpm
No noise with medium or hard acceleration
No noise above 2k rpm
Only audible with the windows down
Doesn't occur when revving the engine in neutral
Way louder when the engine is cold, and gets quieter when warmed up
Car otherwise feels normal


The video makes it sound more like a whoosh, but I can attest on cold days with a cold engine that's it's like a metallic buzzing noise from the front of the car.

Anyone have any idea what this could be? Wastegate rattle? Exhaust leak/rattle?
Did you ever figure this out ?
Appreciate 0
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