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Discussion Starter #1
So my 2011 535i xDrive is making a hissing noise when I accelerate. It's only doesn't on acceleration when rpms kick up high. Here is a video of the noise you start to hear it at two seconds.

https://vid.me/icyZ

What do you guys think it is, is it just the turbos spooling or do I have a leak somewhere?
 

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Daniel T
2017 BMW 5er 2.0d
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213 Posts
Sounds like the blow off valve - one i've found with mine when it changes gear you can hear it. blow off valve very important feature with turbos :) if you think its become louder check the hosing around the blow off valve
 
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