Ideas on buzzing at about 2800 RPM?

Jul 1, 2023
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Howdy folks,

New here so hopefully this is allowed content. Trying to understand a new buzzing sound that has started in my Mk3 Leon Cupra 290 since last weekend.

Originally, I was only noticing it at very low revs - basically at crawling speed, for example when pulling away from a stop or parking. I'd notice a brief buzzing sound at those lower revs as I dab the throttle. It would be non-existent at anything more than crawling speed, so in normal driving I'd hear no buzzing.

However, in trying to pinpoint where the buzzing from coming from, I discovered that I could consistently reproduce the issue by holding my revs at about 2800 RPM.

Here's a video demonstrating this: https://streamable.com/edm3u4 (if Streamable links aren't allowed, I'll re-upload to YouTube).

I think the buzzing is originating from the bottom of right side B pillar, basically where the driver's seatbelt is anchored, as it definitely sounds louder if I point my ears down there.

Here's a another video showing what I mean: https://streamable.com/l8y5if

Unfortunately I haven't got anyone who can rev the car for me while I check how prominent the buzzing is from outside the car, but if I stick my head out of the window while revving it is significantly less noticeable. The buzzing is much more prominent from within cabin and especially when the windows are closed to reduce outside noise.

Anyone have any ideas what could be causing this?

Thanks for any replies in advance! :)
 
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