mercredi 14 janvier 2015

Pneumatic-style air outgassing noise on my E46

Yeah the title sounds weird, but that's the best way that I can describe it.



When I accelerate and then decelerate, I hear a soft 1 second hiss each time. The closest way that I can describe it is as though a hydrolic/pneumatic pump is releasing a burst of air (think of the air noise when a bus or a subway comes to a stop and outgasses). Like a quick "PSSSsshhhh". The noise isn't constant and only happens during a start or a stop. It doesn't seem to be triggered by the brake pedal either, but instead when I depress and then release the gas pedal.



It doesn't seem to affect anything with the acceleration or deceleration. It just makes a noise that's mostly audible in the cabin. Is this normal? I have no clue what it is and feel like maybe the crazy pills are kicking in. :loco:




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