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Single pop sound on cold engine start. Any ideas?

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Old 01-09-2021, 11:36 PM
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2015 Mercedes C300 4-matic Luxury
Single pop sound on cold engine start. Any ideas?
Hi folks, yesterday when starting my wife’s 2015 C300 I heard a weird single pop sound coming out of under the hood area. I was able to reproduce that sound with repetitive engine start/stops. Although the sound was gone after I drove 15 min to the nearest MB dealership. Any ideas what that might be? Attaching the video for the reference.
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Old 01-10-2021, 01:22 PM
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2018 C43
Sounds nice, the unburnt fuel exiting the engine. Kinda like my car which does it all the time.
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Old 07-11-2024, 12:26 PM
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C300
Popping sound on startup
I noticed my 2015 MB C300 (85,000 miles) just starting to do this too. Two to three popping sounds (same as in video above) like someone sticking their finger in their mouth and pulling it out to make a popping sound. It is coming from the central engine bay under the cover somewhere. It goes away after the car has warmed up a minute or two later. Any ideas?
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