Weird Noise Under The Car.. - BMW Forum -

3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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post #1 of 3 (permalink) Old 07-12-2005, 03:26 AM Thread Starter
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hi, i came back from a 70 mile trip last night and there was a strange din din din sort of noise coming from what sounded like under the drivers side just behind the front wheel. it wasn't a rattle or a clonk, but like a noisy hum with a gentle banging that increases with rpm's!!! WTF? any suggestions?
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post #2 of 3 (permalink) Old 07-12-2005, 04:28 AM
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Ever had a bad exhaust gasket, and it didn't sound like that ?

Valve adjustment required or something

| BMW E36 325i | BMW E34 520i | BMW E39 "M5" | BMW E60 530d MAPPED | BMW E38 740iA | BMW E32 750iAL |

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post #3 of 3 (permalink) Old 07-12-2005, 11:42 PM
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Catalytic converter (catalyst) maybe... Had mine changed on warranty a month ago... if that is your problem, keep in mind BMW offers warranty for 7 years on this really expensive part.

Edit: when the parts inside this are broken, you'll hear a really annoying sound, louder when you raise RPM. Usually catalytic converter don't break before 200k + km, except if you bumped on a big fu.... hole and hit it, just like I did ;-)
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