car has a high pitch whining sound coming from the engine that comes and goes while ideling. No effect on performance or starting.
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2003 BMW 325i
Question: Funny sound
Answer #1overbys from Overbys Inc, June 03, 2011, 04:53Master
you probably have one of the bearings ready to fail in one
of the belt tensioners or idler pulleys. this should be
checked by a qualified BMW specialty shop; when the bearing
fails, it will throw off your belts and the car cannot be driven. if this is the noise, replace both serpentine belts, both tensioners and the idler. expect about $550 and
yes, this is very very common.