Hi guys, I'm new here and finding it hard to find the right place to post, so forgive me if this is in the wrong place! Was hoping someone could help me? I have a 2009 3.0 z4. My second one and I love it! Only issue is when you're sitting in the cab stationary and if you listen under the car (from behind and the sides) there is a strange sort of buzzing. Almost sounds like a hairdryer or vacuum cleaner!!
It deffo isn't the radiator fan etc. It sounds like a fan is whirring or sucking in air like a vacuum cleaner - any thoughts??
J
Last edited by HJames; 10-02-2017 at 04:46 PM.
You ran over a hair stylist? /s
Could be a vacuum leak. How does the engine idle? Does the noise change-volume or frequency-as the engine speed changes? Record the sound with your smartphone and post RF video/sound on YouTube. Post the link.
I bet you're hearing the fuel pump.
ASE and BMW Master Certified Technician
Or SAP if it does it at startup
2009 won't have a secondary air pump. Unless its a SULEV, but I think SULEV was 3 series only.
ASE and BMW Master Certified Technician
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I was assuming E89. I've heard loud fuel pumps on both models. It's right behind the passenger seat, and some are louder than others. I've replaced a few for complaints of noise.
ASE and BMW Master Certified Technician
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