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Mubiiii Mubiiii is offline
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Join Date: Jun 2019
Car: 2010 bmw 335xi n54
Default 335i 30ff horn/trumpet noise (with audio) - 08-10-2019, 11:07 PM

Link to noise:
335i boost leak horn noise - YouTube


Ever since i removed my cowl and cabin air filter, I've gotten a really weird noise from under my hood (sounds like its coming from the surface level under the hood). This noise only occurs under hard acceleration and i get immediate power loss (car doesnt pull as much). Sound does not come when i rev the car in park. I changed all my vacuum lines, checked some of my connections (throttle body, cp, intake manifold). I just got a new boost solenoid and I am going to test if any of my 2 solenoids are bad.

Please let me know if there's other things i can test and check.
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