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ChrisGoulding

'Strange' noise from turbo?

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The car is a 2004 320d with 89k. When I throttle up, the turbo makes the usual whistle and pulls very well with no hesitation, etc. However, on letting the throttle off when moving through the gears, there is a strange noise that I assume is coming from the turbo. Its like a low pitch spooling noise as if the turbo winding down. Any one got an idea what it may be?

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