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2Addicts | BMW 2-Series forum Technical Topics Mechanical Maintenance and TSBs: Break-in | Oil & Fluids | Servicing | TSB Weird clunking noise on start up

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      07-23-2015, 11:46 AM   #1
den525
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Been getting this weird clunking noise on start up the last 2 days. Usually cold starts... Not sure what it is has anyone experienced this before?

The only mechanical mod I have done is a cat-back exhaust 5 weeks ago... Maybe it's that? Well gonna get it looked at my the guys who put the exhaust in asap... Hopefully it's nothing major.

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      07-23-2015, 11:52 AM   #2
e46m3lol
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Might just be the normal wastegate rattle noise. Nothing to worry about if it's just that.
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      07-23-2015, 11:59 AM   #3
den525
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Quote:
Originally Posted by e46m3lol
Might just be the normal wastegate rattle noise. Nothing to worry about if it's just that.
Don't think it's there initially it was only a small clunk tonight I started the engine, and it was a long 15-20 seconds vibrating noise

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      07-26-2015, 09:22 PM   #4
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So found out what it was... A nut has come lose... so the exhaust is lose from the hanger... which was making the vibrating noise.

According to the performance shop I got the Milltek exhaust from, this has happened to a few BMWs, where the OEM nut can come lose occasionally, so all he did was replace both nuts with a "teethed" ones.
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