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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 04-05-2012, 04:27 PM   #1 (permalink)
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knocking/banging noise

Hello, I am having a problem with my 525I. Every time I start off from a stop I get a loud knocking or banging noise from under the car. It sounds like it is coming from around the transmission but I am not sure. I have inspected the engine mounts and the transmission mount with no apparent defects noted. I did find a broken exhaust pipe hangar bracket. Replaced it but that did not fix it. After going above ten miles or so the car drives fine with no noise or vibrations at all. Just under ten miles or so.
Any suggestions before I call the dealer's repair shop? Please help!
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Old 04-06-2012, 01:44 AM   #2 (permalink)
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It could be part of the tail shaft assembly/mount that is on its way out. Some of them have heavy rubber parts which take some of the shock out of the drive train.
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Old 04-06-2012, 11:13 AM   #3 (permalink)
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I agree, gearbox mount is perished !
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