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2011 CLS550 - New MB owner *Help*

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Old 01-12-2017, 02:53 PM
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2011 CLS550
2011 CLS550 - New MB owner *Help*

Good morning,
My name is Angela and I purchased my first Mercedes this past November. I recently started hearing a slight humming noise and vibration that last for a few seconds whenever I accelerate. I took it back to the dealer and was told that this was normal for a CLS550. Can anyone confirm this? I don't have a good feeling about it. Any help is much appreciated.

Thank you!
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Old 01-13-2017, 10:33 AM
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moved to C219 forum...
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Old 01-15-2017, 03:18 PM
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If it was "normal" we would have heard about it by now.
I have a 09 CLS550 and had the driveshaft replaced at 105k miles. I would get a vibration at 65 mph, just holding speed. The vibration was not noticeable on acceleration.
I felt strongly that it was the driveshaft, having been there before, but Mercedes wanted to try many things to solve it before they would admit that the driveshaft could be the culprit. They straightened 1 wheel, checked all brake calipers for sticking and "de-tensioned" the exhaust system (which I felt was a ghost). This is where I stopped them and went to my local independent mechanic. He had no doubt it was the driveshaft. He replaced it and there has been no vibration since.
Does your car has a 7 speed transmission? I have heard a few complaints that, when cold (New England winter, 15 degrees, type cold) it will cause a vibration on acceleration, until the fluid warms up.
Do you have a trusted non Mercedes professional mechanic?

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Old 02-22-2017, 08:49 PM
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May simply be a tire or a Flex Disc Angela or may be the Transmission. I would get a second opinion from a Independent Mercedes or Euro Shop. Best of luck
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