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Message: <blockquote data-quote="qkhcad1" data-source="post: 751882" data-attributes="member: 54430">To all sifus here. I just got my E90 320D 2010 99k mileage now. Driven it for a week and noticed what I would describe as a deeper than usual humming sound that comes from the engine which sets in as the car is between 1500-2000 rpm. Searched on the net and found similar issue described by another owner and the fix was on a plastic tube that connects to from the air box to the engine. Without removing the engine cover I was trying to look for any obvious joint issues but cannot see any. Did any of you here encounter such issue before? Thanks in advance for your the input. Sent from my iPhone using Tapatalk</blockquote>