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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20 and N26 Turbo Engine / Drivetrain / Exhaust Modifications > Weird engine noise
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      01-10-2013, 07:04 AM   #1
rolandleth
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Weird engine noise

Hello guys. I'm running a 328i N20.

I just noticed this last night ... http://f.cl.ly/items/0U3n0a3j250j1L0v1N0J/Memo.m4a

From the ~7th second onward the engine is at a constant RPM and you can hear a whoom -- whoom -- whoom noise, noise that I don't event know where it comes from, but I presume it's the engine's fan/cooler (although I also think I'm wrong, heh).
This only happens around 2.5-4k RPM, standing still or moving, doesn't matter. It doesn't happen all the time, which is why I only have one recording, didn't manage to get better ones: at one point it stopped doing it, I took it for a sporty ride around the block, it started doing it again.

Problem is, why does it sound like that? It sounds ... out of balance. Should I take it in for a check?

Thanks!

Last edited by rolandleth; 01-10-2013 at 01:07 PM.
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      04-29-2013, 08:11 AM   #2
rustyminded
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that's weird, try to clean your engine with blower and blow dust away or just go check at the dealer
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      04-29-2013, 11:01 AM   #3
aspang86
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Is your blower fan off? Make sure that the noise isnt coming from the hvac. My cars hvac fan sounds funky at different speeds
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      04-29-2013, 09:31 PM   #4
OCcaraholic
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Sounds like normal A/C compressor noise.
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      07-01-2013, 08:31 PM   #5
tricksterr24
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My car started doing that today
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