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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Crazy wtf is this noise



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      12-16-2016, 08:44 PM   #1
frenchie1013
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So not sure but all of a sudden this started ....


Then it went away after a minute. Then started again once I drove again about an hour later but only lasted 10 seconds.
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      12-16-2016, 09:17 PM   #2
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I think there are sparks flying from the underside of the alternator. Maybe something fell in.
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