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      01-10-2012, 05:13 PM   #85
M3PO
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Drives: '08 IB E92
Join Date: Sep 2011
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Quote:
Originally Posted by mrad01 View Post
Here is a recording of my sound: http://m-works.co.nz/M3Rattle4.mp3
You can hear the noise just after the engine fires. It was MUCH louder in real life.

Insist on a solution.
Damn, that sucks, mine sounds just like that. It only seems to do it if it's sitting for more than a day though (which makes leaky check valves seem plausible). I talked to the dealer and they want to do some cold starts. I've been recording them recently but it hasn't happened again because I've been driving it everyday. I only noticed it over the holidays when I wasn't driving the car every day. I've only got 5 months left on my warranty too...

This was posted earlier but, this also sounds like mine:
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