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Cold start whining

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Old Jan 28, 2025 | 10:31 PM
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Rigerlamlika's Avatar
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Cold start whining

Hello everyone,
I hope someone has the answers!
So my car just came from mechanic but now i have 2 more noises that i didn’t have and wonder where is it coming from!
Today i got this code and i am gonna check this out but my question is can this noise come from this ?
Please ignore the serpentine belt, even though its new im gonna go check where the mechanic **** up installing it cause its brand new and still whines, thats why i changed it in the first place.
Anyway i will attach a link to the video i am uploading to youtube!
https://youtube.com/shorts/1_zB5tqqsDk?si=GwGHnO-JbOasx60E

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Old Jan 29, 2025 | 12:09 AM
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CaliBenzDriver's Avatar
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W212 MY'14 M276-3.5NA @75kMi
Originally Posted by Rigerlamlika
Hello everyone,
I hope someone has the answers!
So my car just came from mechanic but now i have 2 more noises that i didn’t have and wonder where is it coming from!
Today i got this code and i am gonna check this out but my question is can this noise come from this ?
Please ignore the serpentine belt, even though its new im gonna go check where the mechanic **** up installing it cause its brand new and still whines, thats why i changed it in the first place.
Anyway i will attach a link to the video i am uploading to youtube!
https://youtube.com/shorts/1_zB5tqqs...GHnO-JbOasx60E
well your startup whinnin may be related to this P0410 fault: electriclal air injection pump.

I that case then nothing involving serpentine belt.
Hopefully belt tensioner was replaced at once with belt and idlers.

Last edited by CaliBenzDriver; Jan 29, 2025 at 12:11 AM.
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Old Jan 29, 2025 | 06:22 PM
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Raj1471's Avatar
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2011 Mercedes E350 4Matic Wagon
+1 on the secondary air pump. On cold starts it should come on for a little while on initial start up and automatically shut off if it is working properly. If it is constantly on or extremely loud (like jet engine) the secondary air pump is toast. Upload another video of the engine bay with the noise present.
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