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Clunk when accelerating from stop

 
Old 02-19-2019, 10:54 AM
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2019 C63WS
Clunk when accelerating from stop

Hi have about 400 miles on my new C63S and it's done this since the day I picked it up. I thought maybe it was just DCT but maybe not. If I'm driving and come to a full stop or even slow down promptly then get back on the gas you can hear and also kind of feel a clunk from right under the mid part of the cabin. Funny thing is if the car is in sport or sport+ the car doesn't do this, only in comfort. Any ideas? Transmission mounts maybe? Would it be fine to wait for the differential service before taking it in, or should I make an appointment with dealer asap? Thanks.
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Old 02-19-2019, 08:04 PM
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mine has done that, too, since day 1. It doesn't happen every drive and I have about 1k miles now. It sounds (feels) more like it's happening at the wheel hub than the center of the car. I wondered if it was the the rotor/wheel interaction causing it. drives fine. I'm just gonna ask when I take it in for differential service.
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Old 02-19-2019, 08:14 PM
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2016 C63S Sedan
Originally Posted by Cascade1 View Post
Hi have about 400 miles on my new C63S and it's done this since the day I picked it up. I thought maybe it was just DCT but maybe not. If I'm driving and come to a full stop or even slow down promptly then get back on the gas you can hear and also kind of feel a clunk from right under the mid part of the cabin. Funny thing is if the car is in sport or sport+ the car doesn't do this, only in comfort. Any ideas? Transmission mounts maybe? Would it be fine to wait for the differential service before taking it in, or should I make an appointment with dealer asap? Thanks.
FYI this car does not have a DCT. It is a standard Automatic transmission with a multi plate wet clutch in place of the fluid coupling.
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Old 02-20-2019, 12:21 PM
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Originally Posted by AJRDU View Post
mine has done that, too, since day 1. It doesn't happen every drive and I have about 1k miles now. It sounds (feels) more like it's happening at the wheel hub than the center of the car. I wondered if it was the the rotor/wheel interaction causing it. drives fine. I'm just gonna ask when I take it in for differential service.
If you find out before me lmk please.
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Old 07-12-2019, 05:05 PM
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Originally Posted by Cascade1 View Post
If you find out before me lmk please.
Any update?
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Old 07-12-2019, 05:08 PM
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Originally Posted by Defiant81 View Post
Any update?
I had them check it when I took it in for the 2000 mile differential service. They said they couldn't reproduce the noise, but oddly enough it's gone. Don't know if something they did servicing the differential fixed it or what happened but ever since then it hasn't been a problem.
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Old 07-13-2019, 01:32 PM
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I had that on my C63 and it was a loose exhaust. Fixed at 1k kms service.
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