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Strange sound. Need info/identification Video Linked.

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Old Oct 25, 2019 | 04:48 PM
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drewsolace's Avatar
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2018 c43 AMG
Strange sound. Need info/identification Video Linked.

Sorry guys to keep coming at you with issues. I really appreciate all your replies and trust your information. Thank you for being so kind so far.


I am getting a strange sound from my PE. Upon revving, as the RPMs fall away from peak of the rev I hear a grinding-ish sound coming from the exhaust. I don't remember this being present until today. Please listen to the video and tell me what you think. This didn't seem normal compared to other PE sounds. Make sure to listen until the end as it is highly exhibited on my last example rev in the sequence. Thank you!
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Old Oct 25, 2019 | 05:40 PM
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C43 AMG Coupe
Are you talking about the sound at the end of each rev? If so I believe it is related to the vacuum / exhaust valves.
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Old Oct 25, 2019 | 05:43 PM
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Originally Posted by ShakyTom
Are you talking about the sound at the end of each rev? If so I believe it is related to the vacuum / exhaust valves.

Yes, the scraping/airy sound onnly present briefly when the revs fall from peak of the rev. Normal/bad? I know it wasn't like that until I noticed it today.
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Old Oct 25, 2019 | 06:03 PM
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My car has always done it, don't think there's anything wrong with it.
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Old Oct 26, 2019 | 01:54 AM
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^ same here.

Also, it is definitely a vacuum sound, not grinding.
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Old Oct 26, 2019 | 09:48 AM
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Sounds normal. If you an exhaust leak you would here it all the time. Exhaust will sound different from when car is cold and when the car is warmed up as well.
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