Strange whirring/rubbing noise in engine
Have developed a strange sound when car hits 1000 rpm, usually when I'm coasting to a stop. It's there also when car is in park and I get the engine to 1000 rpm. When rpms get to 1200 or 1400 it goes away. Sounds like a whirring sound coming from engine. Has a slight vibration to it too. Service tech could hear it and thought it sounded like something rubbing, but so far they haven't been able to identify. Anyone else experience this? Car is a 2012 x3. Thanks.