question
Thread Starter
Newbie
Joined: Jun 2023
Posts: 5
Likes: 0
2019 c43 amg
question
I just bought a 2019 c43 amg with 45000 km on it, pretty well maintained car.
When i start the car there is a rattling noise underneath the car (i’m thinking it’s my heat shield) is this a common problem or has anyone had this before. Thanks
When i start the car there is a rattling noise underneath the car (i’m thinking it’s my heat shield) is this a common problem or has anyone had this before. Thanks
Super Member
Joined: Oct 2019
Posts: 841
Likes: 315
C43
Not a common problem that I am aware of (separate and distinct from the interior creeks that permeate the w205 platform). Does the problem get better or go away when the car warms up? When rattling, does it get better or worse with RPM? Can you tell if it is from the lower front, middle or back of the car?
Thread Starter
Newbie
Joined: Jun 2023
Posts: 5
Likes: 0
2019 c43 amg
response
When the car warms up it gets quieter aswell as when the rpm’s are dropping when starting it gets quieter, i cannot here it when i drive or go thru high rpm’s as the exhaust is quite loud. I’d also say it would be in the middle to back area baby
Super Member
Joined: Oct 2019
Posts: 841
Likes: 315
C43
MBWorld God!
Joined: Dec 2019
Posts: 32,342
Likes: 6,318
Do you have the “performance exhaust” - the one with the button to open and close valves? If so, it could be a valve issue. Due to the fact that it gets better when warm, I doubt it is a heat shield issue (from a root cause standpoint). Your goal should be pinpointing the general area where the sound is coming from (perhaps have someone else start your car when cold, while you are outside the car).
Thread Starter
Newbie
Joined: Jun 2023
Posts: 5
Likes: 0
2019 c43 amg
response
Ahyes i do, if so would that be a big issue? I am not to great with cars this is my first performance car if you could say.
I will do that to get a better pinpoint tomorrow aswell as take a video and send it with the sound, thanks a lot.
I will do that to get a better pinpoint tomorrow aswell as take a video and send it with the sound, thanks a lot.
Trending Topics
Member
Joined: Sep 2017
Posts: 136
Likes: 28
From: Toronto
C43 2017
Op.....if you are new to our. platform, injectors are very loud and ticky upon starup, even worse if started in a garage. Plus the slight delay for the oil to reach upper engine parts when cold. As long as sound goes away or is acceptable when hot and does not get worse or louder. Should be good.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Member
Joined: Sep 2006
Posts: 233
Likes: 49
From: Pennsylvania
2019 GLC 63, 2020 C43 coupe
It's the turbo wastegate flapper doors. These cars cold start with the wastegates open until the vacuum pump builds enough pressure to close them(usually less than 30 seconds), so the flappers will rattle until they are seated/pulled shut. This is also why these cars are so loud for the first 30ish seconds and then "calm" down.
Last edited by 4npower; Jun 30, 2023 at 07:35 AM.
MBWorld God!
Joined: Dec 2019
Posts: 32,342
Likes: 6,318
It's the turbo wastegate flapper doors. These cars cold start with the wastegates open until the vacuum pump builds enough pressure to close them(usually less than 30 seconds), so the flappers will rattle until they are seated. This is also why these cars are so loud for the first 30ish seconds and then "calm" down.
MBWorld God!
Joined: Dec 2019
Posts: 32,342
Likes: 6,318
Thread Starter
Newbie
Joined: Jun 2023
Posts: 5
Likes: 0
2019 c43 amg
response
[QUOTE=W205C43PFL;8807353]Hmmm strange I don't hear anything abnormal what timestamp is the sound at?
it’s from about 5 seconds to 8 seconds in the video, it’s almost just a faint rattle that you hear come on then starts to get quieter as rpm falls towards end of vid. you will hear the car start and about 1-2 seconds after that the sound comes on.
Seems like not a big issue, car runs smoothly was just more so curious.
it’s from about 5 seconds to 8 seconds in the video, it’s almost just a faint rattle that you hear come on then starts to get quieter as rpm falls towards end of vid. you will hear the car start and about 1-2 seconds after that the sound comes on.
Seems like not a big issue, car runs smoothly was just more so curious.
MBWorld God!
Joined: Dec 2019
Posts: 32,342
Likes: 6,318
[QUOTE=matteoflaim;8807472]
Ya so I don't hear anything abnormal from your video, I initially thought your device didn't pick up the sound but then you said you can hear it at 5 seconds to 8 seconds and from what I hear, nothing out of the ordinary. Enjoy your car as it doesn't seem like there is anything wrong with it. 
Hmmm strange I don't hear anything abnormal what timestamp is the sound at?
it’s from about 5 seconds to 8 seconds in the video, it’s almost just a faint rattle that you hear come on then starts to get quieter as rpm falls towards end of vid. you will hear the car start and about 1-2 seconds after that the sound comes on.
Seems like not a big issue, car runs smoothly was just more so curious.
it’s from about 5 seconds to 8 seconds in the video, it’s almost just a faint rattle that you hear come on then starts to get quieter as rpm falls towards end of vid. you will hear the car start and about 1-2 seconds after that the sound comes on.
Seems like not a big issue, car runs smoothly was just more so curious.
