Matt_Chaps Posted June 25, 2021 Share Posted June 25, 2021 Took my 3.4 S for a spin tonight and noticed a whistling coming from the engine, matches revs - higher the revs, higher the pitch…and then whistles all the way back down the Rev range as you’re off the gas. It wasn’t there before when I drove it back from purchase. It sounds like air escaping through a tiny crack but def not AC or vents. Coming from the rear in engine bay. Anyone had this before on their Cayman? Any help is much appreciated Matt Link to comment Share on other sites More sharing options...
Andyoz Posted June 25, 2021 Share Posted June 25, 2021 Could be a few things. Air Oil Separator possibly. Link to comment Share on other sites More sharing options...
Lennym1984 Posted June 26, 2021 Share Posted June 26, 2021 Is it actually from the engine bay or could it be alternator whine through the speakers? My first car used to sound like a turbo because of this Link to comment Share on other sites More sharing options...
Matt_Chaps Posted June 26, 2021 Author Share Posted June 26, 2021 Only very recently started. It def sounds like it’s coming from behind and is tied to the revs. Barely audible below 2000. Link to comment Share on other sites More sharing options...
wtaite01 Posted June 26, 2021 Share Posted June 26, 2021 (edited) Odd question, but has the oil/coolant fill hatch been left open? I noticed similar noises after a service and spoke to my indie about it. I eventually found that this had been left open. I closed it and the noise went away. I was very surprised at the difference it made (as was my indie). Edit - just reread your post, mine was more of a whirring than a whistling, so may not be relevant. Edited June 26, 2021 by wtaite01 Link to comment Share on other sites More sharing options...
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