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Discussion Starter #1
Hi everyone, quick questions to anyone who may have some insite to this issue. I have a 07 S80 3.2L V6 Sedan, it has 16,000 miles on it and just a week ago it started making a bizzare noise after starting, for the first 3 mins or so when it's running, it makes a wrrr sound stops for 3 to 5 seconds then does it again. This is only on a cold start so first thing in the morning or after it's sits for about 7 or 8 hours. The car runs fine otherwise but the noise is strange seems to come from the back of the engine on the drivers side somewhere near the AC compressor.

No warnings or messages on the dash display.

any input would be appriciated, I'm going to take it to the dealer however I dont want to underplay the issue and wait on something that may be more serious then I think. I do have a soundbit of the noise however can't seem to add it to my posting.
 

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Discussion Starter #3
The noise was the PCV box, there is a PCV electonic system that when it starts to go bad makes a buzz for the first 3 to 5 mins after a cold start. They replaced the box and everything is working fine now no noise upon cold startup. the repair consisted of a oil trap, gasket and PCV box.
 
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