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C400 2015 few second rattle on cold start, does not rattle when engine is warm

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Old Apr 10, 2019 | 12:04 PM
  #1  
Blackhead Kings's Avatar
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C400 2015
C400 2015 few second rattle on cold start, does not rattle when engine is warm

https://youtu.be/CK6RJPA6AEM

Tensioners changed still making same noise


Thought maybe the chains been stretched,

Brougt it to mercedes they said it has somthing to do with the fuel and filter or somthing with a pin causing the rattling and ticking.

They are still investigating before i bring it back again.

Anyone here had the same problem?
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Old Apr 10, 2019 | 10:23 PM
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From: GR, Michigan
2015 Mercedes C400
Originally Posted by Blackhead Kings
https://youtu.be/CK6RJPA6AEM

Tensioners changed still making same noise


Thought maybe the chains been stretched,

Brougt it to mercedes they said it has somthing to do with the fuel and filter or somthing with a pin causing the rattling and ticking.

They are still investigating before i bring it back again.

Anyone here had the same problem?
I read your post and was about to say I have the same problem, but then I listened to your video and holy ****. Mine has a couple second light rattle from a cold start, kind of like a loose heat shield underneath? Yours sounds terrible (no offense). Please let us know what the dealership says
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Old Apr 15, 2019 | 10:02 PM
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C400 2015
I made another video today

Really out of solutions.... this only happends when the car is warm, there no way to show to mechanics cause it only happends when the car is park for another 20 mins


Does anyone here have similar problems?

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Old Apr 16, 2019 | 08:44 AM
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From: GR, Michigan
2015 Mercedes C400
What’s your oil level at? Full? Maybe the head is starved for a few seconds until oil pressure builds
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Old Apr 16, 2019 | 02:38 PM
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Oil level is full, with molly

Originally Posted by bzammitt
What’s your oil level at? Full? Maybe the head is starved for a few seconds until oil pressure builds
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Old Apr 16, 2019 | 11:24 PM
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From: Tampa, FL
W205 C300
Dude, that sounds horrible. If they can't find out what the issue is, go to another dealer. That engine sounds like it's being destroyed.
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Old Apr 20, 2019 | 09:44 PM
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C400 2015
Brought i car in to MB Durham

Work order attached:

When I got the car back there was still little rattle but not as bad as before, so whatever they did maybe helped a little

2 days go by the rattle progressily grew louder until it was back to the original rattle

Made a new clip:




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Old Apr 22, 2019 | 10:27 PM
  #8  
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C400
Wow! That sounds absolutely terrible. Curious to see what it is.
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Old Apr 25, 2019 | 03:24 PM
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2009 C300 4Matic
Lifter clacks?
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Old Jun 17, 2022 | 10:47 AM
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2015 C400
Similar sound from my 2015 C400 with 107k miles. Camshaft Adjuster issue. Cost $3,300 and took 50 days to get the parts in from Germany. This used to be my favorite car, ever.
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Old Oct 3, 2024 | 12:07 AM
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Originally Posted by mikeyvol
Similar sound from my 2015 C400 with 107k miles. Camshaft Adjuster issue. Cost $3,300 and took 50 days to get the parts in from Germany. This used to be my favorite car, ever.
Hey man, did you fix this? I recently purchased a 2015 C400 and am starting to hear this noise. If you did fix it, is the car still running well? Thanks
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Old Oct 3, 2024 | 08:13 AM
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2015 C400
I fixed it but only kept the car for four more months.
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Old Oct 6, 2024 | 08:45 PM
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2015 C400 ( W205 )
Cam shaft adjuster or sprocket, it's the part that goes on the can shaft and has the chain on it, common in all M276 engines, you are not alone, fix is around $2-$4K
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Old Oct 10, 2024 | 07:03 PM
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Originally Posted by f.majdalz
Cam shaft adjuster or sprocket, it's the part that goes on the can shaft and has the chain on it, common in all M276 engines, you are not alone, fix is around $2-$4K
That’s definitely doable, I’ve been looking into getting it fixed but my biggest obstacle is trying to find the parts. Ordering from MB is murder but something I’m beginning to consider. Something else I’m wondering is if it will become a recurring issue. Once it’s fixed, say after 50k kms would the noise return? Or is this an issue that can be avoided with preventive maintenance?
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Old Oct 10, 2024 | 07:29 PM
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2015 C400
My concern was the left camshaft adjuster repair cost $3,300 and there’s a “right” camshaft adjuster as well.
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Old Oct 10, 2024 | 07:34 PM
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Originally Posted by mikeyvol
My concern was the left camshaft adjuster repair cost $3,300 and there’s a “right” camshaft adjuster as well.
I believe there are four of them on this engine. I’m not sure the extent of the damage yet but we will see. Car ran good the four months you kept it?
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Old Oct 10, 2024 | 09:13 PM
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2015 C400
I had no problems for the four months before I traded it in.
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