Weird Rattle Under hard acceleration
Thread Starter
Junior Member
Joined: Jul 2015
Posts: 63
Likes: 7
From: UK
Mercedes-Benz 2016 C63S
Weird Rattle Under hard acceleration
Hi all - not sure if anyone else has experienced this or perhaps knows what this is...
I have a 2016 C63S (8 months old) and recently noticed a weird metallic sounding rattle from the engine when under hard acceleration. To best reproduce the noise... if I am in manual transmission in 3rd gear with revs sitting at around 1500-2000 and then put my foot down on the accelerator, it starts to pull with normal sound, then as you feel the torque kicking in a metallic rattle becomes quite noticeable. First gear I cannot pick up the noise and in second it is there but the power delivery is so quick with high engine noise that its hard to pick up... but third and fourth its easily noticeable.
MB dealership came with for a test drive, noticed the noise and said it shouldn't be doing that. Left the car with them for a day and they gave it back to me making the same noise and simply said its something MB Germany are aware of and are working on a software update for it? Said it might have something to do with the fuel injection???
MB also said its not something to worry about and when the software update is released they would call me in for the update?
Does this sound right to you guys? Apologies for the query but I'm not very mechanically minded and to me a noise like that is concerning for 1, and also I'm not sure how a software update would resolve a mechanically metallic sounding noise...?
I have a 2016 C63S (8 months old) and recently noticed a weird metallic sounding rattle from the engine when under hard acceleration. To best reproduce the noise... if I am in manual transmission in 3rd gear with revs sitting at around 1500-2000 and then put my foot down on the accelerator, it starts to pull with normal sound, then as you feel the torque kicking in a metallic rattle becomes quite noticeable. First gear I cannot pick up the noise and in second it is there but the power delivery is so quick with high engine noise that its hard to pick up... but third and fourth its easily noticeable.
MB dealership came with for a test drive, noticed the noise and said it shouldn't be doing that. Left the car with them for a day and they gave it back to me making the same noise and simply said its something MB Germany are aware of and are working on a software update for it? Said it might have something to do with the fuel injection???
MB also said its not something to worry about and when the software update is released they would call me in for the update?
Does this sound right to you guys? Apologies for the query but I'm not very mechanically minded and to me a noise like that is concerning for 1, and also I'm not sure how a software update would resolve a mechanically metallic sounding noise...?
Thread Starter
Junior Member
Joined: Jul 2015
Posts: 63
Likes: 7
From: UK
Mercedes-Benz 2016 C63S
After various road tests with MB engineers and explaining noise difference between having performance exhaust flaps open and off... they were still convinced it was something to do with fuel injection.
Yesterday had another visit booked in and road tested with another MB engineer and showed him the differences, immediately he said it sounds like butterfly flaps in the exhaust system are faulty. They have ordered new ones and will go back when they have arrived to have replaced and hopefully this resolves the problem
Hope none of you have had any similar issues...
Newbie
Joined: Sep 2016
Posts: 4
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Mercedes-AMG C 63 S Sedan 2016
Hi Sabre1978, I also own and 2016 C63S (Sedan) since April 2016 and I have been experiencing the exact same issue as you. The dealership said it was a normal sound but I am not convinced.
Do you have any updates on the source of the rattling noise? Was it coming from the fuel injectors or the butterly flaps in the exhaust system?
Do you have any updates on the source of the rattling noise? Was it coming from the fuel injectors or the butterly flaps in the exhaust system?
Thread Starter
Junior Member
Joined: Jul 2015
Posts: 63
Likes: 7
From: UK
Mercedes-Benz 2016 C63S
Hi Sabre1978, I also own and 2016 C63S (Sedan) since April 2016 and I have been experiencing the exact same issue as you. The dealership said it was a normal sound but I am not convinced.
Do you have any updates on the source of the rattling noise? Was it coming from the fuel injectors or the butterly flaps in the exhaust system?
Do you have any updates on the source of the rattling noise? Was it coming from the fuel injectors or the butterly flaps in the exhaust system?
It was an issue with the butterfly flaps. MB had to replace a large section of the exhaust as it is one piece apparently which also incorporates the electronics for the butterfly flaps. Once this new exhaust was replaced the car sounds absolutely perfect again and no hint of the rattling noise as before
I would push them hard to have this done if you're experiencing the same issue that I was having. Best of luck to you, I know how annoying it is with the rattle. Let me know how you get on mate.
Newbie
Joined: Sep 2016
Posts: 4
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Mercedes-AMG C 63 S Sedan 2016
Thanks Sabre1978, will definitely push them and keep you updated. I'm glad I found someone who had the same issue (I'm not that crazy after all!) and more pleased to hear you no longer have that issue!
Thread Starter
Junior Member
Joined: Jul 2015
Posts: 63
Likes: 7
From: UK
Mercedes-Benz 2016 C63S
Anyway its sorted. Hope you get yours done and fixed mate! It does make you appreciate the sound just that little more when it sounds right again
Senior Member
Joined: Sep 2016
Posts: 438
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A Benz and a BMW
What happens if you change to 2nd gear when the rattling starts?
I've experienced something like this before in a different car - basically I was in a gear higher than I needed to be for the speed I was travelling and even light acceleration was causing the car to vibrate / rattle. Might be a dumb suggestion but definitely worth trying to see if it makes a difference.
I've experienced something like this before in a different car - basically I was in a gear higher than I needed to be for the speed I was travelling and even light acceleration was causing the car to vibrate / rattle. Might be a dumb suggestion but definitely worth trying to see if it makes a difference.
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Newbie
Joined: Oct 2017
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C63S E Performance
Hi all - not sure if anyone else has experienced this or perhaps knows what this is...
I have a 2016 C63S (8 months old) and recently noticed a weird metallic sounding rattle from the engine when under hard acceleration. To best reproduce the noise... if I am in manual transmission in 3rd gear with revs sitting at around 1500-2000 and then put my foot down on the accelerator, it starts to pull with normal sound, then as you feel the torque kicking in a metallic rattle becomes quite noticeable. First gear I cannot pick up the noise and in second it is there but the power delivery is so quick with high engine noise that its hard to pick up... but third and fourth its easily noticeable.
MB dealership came with for a test drive, noticed the noise and said it shouldn't be doing that. Left the car with them for a day and they gave it back to me making the same noise and simply said its something MB Germany are aware of and are working on a software update for it? Said it might have something to do with the fuel injection???
MB also said its not something to worry about and when the software update is released they would call me in for the update?
Does this sound right to you guys? Apologies for the query but I'm not very mechanically minded and to me a noise like that is concerning for 1, and also I'm not sure how a software update would resolve a mechanically metallic sounding noise...?
I have a 2016 C63S (8 months old) and recently noticed a weird metallic sounding rattle from the engine when under hard acceleration. To best reproduce the noise... if I am in manual transmission in 3rd gear with revs sitting at around 1500-2000 and then put my foot down on the accelerator, it starts to pull with normal sound, then as you feel the torque kicking in a metallic rattle becomes quite noticeable. First gear I cannot pick up the noise and in second it is there but the power delivery is so quick with high engine noise that its hard to pick up... but third and fourth its easily noticeable.
MB dealership came with for a test drive, noticed the noise and said it shouldn't be doing that. Left the car with them for a day and they gave it back to me making the same noise and simply said its something MB Germany are aware of and are working on a software update for it? Said it might have something to do with the fuel injection???
MB also said its not something to worry about and when the software update is released they would call me in for the update?
Does this sound right to you guys? Apologies for the query but I'm not very mechanically minded and to me a noise like that is concerning for 1, and also I'm not sure how a software update would resolve a mechanically metallic sounding noise...?
The dealer took a test drive with me.
Do you have the AMG Sport Exhaust? Or do you have the button in the middle console, to make the exhaust sound louder/softer? You will notice when you disable this button, the noise goes away. Which makes them suspect, that the actuator/flap inside the exhaust is rattling.
They have just replaced the actuator, and it is only slightly better. They contacted Germany, and they confirmed this is a problem.
The dealer is now waiting for a solution from Germany.
Let me know if they found a solution for your car.
I am in South Africa.
Thanks
Rudi
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Newbie
Joined: Sep 2016
Posts: 4
Likes: 0
Mercedes-AMG C 63 S Sedan 2016
I have the same exact issue.
The dealer took a test drive with me.
Do you have the AMG Sport Exhaust? Or do you have the button in the middle console, to make the exhaust sound louder/softer? You will notice when you disable this button, the noise goes away. Which makes them suspect, that the actuator/flap inside the exhaust is rattling.
They have just replaced the actuator, and it is only slightly better. They contacted Germany, and they confirmed this is a problem.
The dealer is now waiting for a solution from Germany.
Let me know if they found a solution for your car.
I am in South Africa.
Thanks
Rudi
The dealer took a test drive with me.
Do you have the AMG Sport Exhaust? Or do you have the button in the middle console, to make the exhaust sound louder/softer? You will notice when you disable this button, the noise goes away. Which makes them suspect, that the actuator/flap inside the exhaust is rattling.
They have just replaced the actuator, and it is only slightly better. They contacted Germany, and they confirmed this is a problem.
The dealer is now waiting for a solution from Germany.
Let me know if they found a solution for your car.
I am in South Africa.
Thanks
Rudi
