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      10-25-2022, 10:52 AM   #1
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Rattling sound right after start

When I'm outside my car remote starting it, there is a quick rattling sound after it starts. Anyone else hear this? Did it since new….only 3k miles on it.

Sounds like the starter motor disengaging or something to that effect. This is not an internal engine noise, it's peripheral.
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      10-25-2022, 06:30 PM   #2
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Same. I don’t have an answer, but I thought I’d chime in and say my 2022 M550i has done the same thing since I’ve owned it. I took delivery in late July and it has 1900 miles currently. Mine sounds almost like some component of the exhaust rattles, just for 1-2 secs, and only audible from out side immediately after start.
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      10-25-2022, 06:53 PM   #3
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Might be the high pressure fuel pump
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      10-25-2022, 07:43 PM   #4
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Quote:
Originally Posted by robbyb83 View Post
Same. I don’t have an answer, but I thought I’d chime in and say my 2022 M550i has done the same thing since I’ve owned it. I took delivery in late July and it has 1900 miles currently. Mine sounds almost like some component of the exhaust rattles, just for 1-2 secs, and only audible from out side immediately after start.
Yes exactly.
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      10-25-2022, 08:04 PM   #5
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Quote:
Originally Posted by 2022M550i View Post
Yes exactly.

Honestly, I’m not sure if it’s a problem, or just how it sounds.
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      10-26-2022, 05:57 AM   #6
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They all do it. It is the wastegate in the Turbo. Every M550i that does a cold start makes that 1-2 sec rattle.
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      10-26-2022, 06:40 AM   #7
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Quote:
Originally Posted by Sam_M550i View Post
They all do it. It is the wastegate in the Turbo. Every M550i that does a cold start makes that 1-2 sec rattle.
Ahhhh…yes, only on cold starts. I was actually thinking of the wastegate, but then thought BMW wouldn't allow that kind of slop. Robbyb83 nailed it too…the exhaust. You were in the right ballpark. Glad its not an issue.
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      10-26-2022, 08:07 AM   #8
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      10-27-2022, 05:57 AM   #9
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Although normal, it really should not be like that. Wish there was a solution as I don't want to hear a rattle of any kind.
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      10-14-2023, 05:31 PM   #10
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I found a rattle under my backseat. It's rattling at start up and 1500 rpm. I removed the rear seat and on the passenger side removed the fuel pump access panel. Found the rattle to be a plastic fuel line 😎. Hopefully this helps someone. I posted it on. Tictok and yt. 2018 m550i
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      10-15-2023, 07:33 AM   #11
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Quote:
Originally Posted by M550ixEric View Post
I found a rattle under my backseat. It's rattling at start up and 1500 rpm. I removed the rear seat and on the passenger side removed the fuel pump access panel. Found the rattle to be a plastic fuel line 😎. Hopefully this helps someone. I posted it on. Tictok and yt. 2018 m550i
Very interesting! I remember reading somewhere that people were going nuts with some rattle sound Near the rear passenger seat area. You should actually start your own thread.
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