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i have noise only when the car is at rest. After i drive off and coming to stop or light, noise comes back on.The noise isnt loud but you can hear it clearly when its parked. I had it diagnose by bmw few weeks back and they report it was fine. BMW replaced HPFP. I even had shop foreman test drive the car and also heard "sputtering" noise. Almost sounds like something is caught on fan/belt as it slow down you hear it more.. As u speed up the noise goes away.
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