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...
rscience Posted May 1, 2023 Share Posted May 1, 2023 Hey @Matt_Chaps! Have the issue been resolved? I had the same and as weird as it may sound, the culprit was the aux cable. The whistle came from the speakers and it matched revs (The higher the revs the higher the pitch). Muting the audio system removed the whistle complety. Link to comment Share on other sites More sharing options...
Matt_Chaps Posted May 11, 2023 Author Share Posted May 11, 2023 On 01/05/2023 at 11:24, rscience said: Hey @Matt_Chaps! Have the issue been resolved? I had the same and as weird as it may sound, the culprit was the aux cable. The whistle came from the speakers and it matched revs (The higher the revs the higher the pitch). Muting the audio system removed the whistle complety. Yes! I actually discovered this by accident two weeks ago…figured out that my volume was all the way up to accommodate the aux cable and iPhone. Once I turned it down, the whistling stopped. Glad you got to the bottom of it too. Matt Link to comment Share on other sites More sharing options...
andygo Posted June 13, 2023 Share Posted June 13, 2023 (edited) https://imgur.com/Zmq5IxA Broken exhaust actuator Edited June 13, 2023 by andygo Link to comment Share on other sites More sharing options...
andygo Posted June 13, 2023 Share Posted June 13, 2023 1 hour ago, andygo said: https://imgur.com/Zmq5IxA Broken exhaust actuator Oops, wrong section. Link to comment Share on other sites More sharing options...
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