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High-pitched whistling sound from engine...ideas?

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High-pitched whistling sound from engine...ideas?

 
Old 07-23-2017, 04:37 PM
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High-pitched whistling sound from engine...ideas?

Lads and gents,

Interesting "problem"... But figure it's something that's been encountered before, thus the post here in the forums.

I have a 2009 C63, getting near 100k miles, but still running strong. No mechanical issues... Save for one annoying, piercing whistling sound from the engine that I've yet to pinpoint in a quick once over. The noise ISN'T present for 20-30 seconds after cold start, but then kicks in and doesn't stop thereafter.

All ideas welcome.

Thanks!
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Old 07-23-2017, 05:26 PM
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Originally Posted by WAC63 View Post
Lads and gents,

Interesting "problem"... But figure it's something that's been encountered before, thus the post here in the forums.

I have a 2009 C63, getting near 100k miles, but still running strong. No mechanical issues... Save for one annoying, piercing whistling sound from the engine that I've yet to pinpoint in a quick once over. The noise ISN'T present for 20-30 seconds after cold start, but then kicks in and doesn't stop thereafter.

All ideas welcome.

Thanks!
Leaking PCV valve at the rear of the engine. Not expensive, but fiddly to replace. Common issue.


Last edited by Wiggis; 07-23-2017 at 05:29 PM. Reason: added link to video
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Old 07-23-2017, 08:08 PM
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2012 C63 with P30, LSD, and EES Supercharger, 1959 Plymouth with Viper V10 and Tremec 6sp
Originally Posted by Wiggis View Post
Leaking PCV valve at the rear of the engine. Not expensive, but fiddly to replace. Common issue.

https://www.youtube.com/watch?v=DbBEPv6-KY0
I can't hear much on your video but if the PCV valve isn't the problem I would check your idler pulleys. I had two fail at 28K miles and they can screech and squeal before the seize and take out your serpentine belt.
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