Guys, I need a little help on a noise that I'm hearing after shutting down the engine. i have a 2001 330i (e46). Here's a link to the sound file to hear what I'm talking about......The sound is around 6 seconds in and again at 22.
The woosh sound is your CCV letting off vacuum pressure. It's normal - mine's done it for as long as I can remember. If it starts to sound like a fog horn, chewbacca, dying duck, then it's clogged and needs replacing. Most people replace around 80-100k as preventive maint as they tend to clog and the hoses get brittle and leak.
Not necessarily.....the sure sign of a bad CVV is when that "whoosh" sound turns more to a foghorn noise. There are tests you can perform to test yours out and directions are either in the WIKI or can be found by searching similar threads on this site.
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