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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 11-24-2009, 09:08 PM
jcourcoul jcourcoul is offline
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Dying CVV? Diagnosis, please?

When I was installing and testing the new SilverStar high beams and Nokya fogs, I discovered that when the engine is shut off, it makes an unusual "puff" sound, like vacuum is released somewhere. First thing that came to mind is the infamous CVV. This is what I have gathered thus far:
  • Car has 55k KM/34k Miles. Built Aug/05, sold Oct/05, third owner.
  • No oil consumption. None, nada, zilch. Even when I've taken it up to 130MPH.
  • No smoking in the tailpipe. Passed stringent emissions controls.
  • When the oil fill cover is removed, idle goes somewhat rough.
  • Plastic bag over oil fill hole gets sucked in about 1 1/2 inch.
  • CVV and associated tubing is completely dry.
  • Engine as a whole is also completely dry.
I've recorded two sound samples. First one I start the engine, let it stabilize at idle, rev it up to 2K, drop back to idle, then shut off. The puff occurs about half a second afterwards. Second sample is a higher resolution of the puff sound. Left both in MP3 format at http://public.me.com/courcoul

Is this a normal sound for this engine? Or is the CVV in the first stages of failure? Also appreciate any diagnosis of anything else you might hear.
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  #2  
Old 11-24-2009, 09:29 PM
Starless Starless is offline
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I listened to your files. I have absolutely the same sound. Identical. According to a tech at my Indy the sound is produced by ICV at shut down and is completely normal. Many people have it. CVV that tech said would be very different. People describe it as a cow, coyote and what not sound.
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  #3  
Old 11-24-2009, 09:44 PM
jcourcoul jcourcoul is offline
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Great! That's excellent news. Should have added that this was the first time I had the hood open and standing next to it when shutting the engine down, given that the puff sound is quite subdued. Since I plan to do the VANOS during Xmas vacations, just wanted to make sure I didn't have to get yet more parts!

Thanks!
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Old 11-24-2009, 10:19 PM
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KrisL KrisL is offline
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Agreed, normal.
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Old 11-25-2009, 06:07 AM
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smolck smolck is offline
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Quote:
Originally Posted by krisl View Post
agreed, normal.
+1
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Old 11-25-2009, 07:53 AM
jcourcoul jcourcoul is offline
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Thanks again, Kris & Shad. That means that unless the car decides to redo its seasonal budget by itself by busting a CAB, blowing the expansion tank or some other creative means, it may just get AE's as a Xmas present...
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Old 11-25-2009, 11:04 AM
Mark@EAC Mark@EAC is offline
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many of the I6 BMW cars make that sound at shut down, you are fine.
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  #8  
Old 02-17-2011, 09:13 AM
Wildman536 Wildman536 is offline
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Great thread!
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