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Buzzing noise when accelerating

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Old Sep 26, 2016 | 07:47 PM
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fapfap1108's Avatar
fapfap1108
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2013 C300 Sport 4matic
Buzzing noise when accelerating
Hi guys,

This is my first post on this forum. I have a 2013 C300 Sport 4matic. I've been having this issue for a while but I'm not sure if it really is a problem.

When I'm at cruising speed around 70mph (~2000rpm) when I hit the gas pedal, there is a noticeable buzzing noise, which I'm not sure it is from the engine or the exhaust. When I let the gas pedal go the noise disappears. If I manually switch the gear to 5th (~3000rpm) the buzzing also goes away.

I'm planning to go to the dealership next week to check it out. Any suggestions or it is normal?

BTW I had my ECU tuned by Kleeman

Thanks in advance!
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Old Sep 27, 2016 | 08:26 AM
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Atlas Grey
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2005 Porsche 911, 1991 Jeep Grand Wagoneer, 2012 Mercedes C300 4Matic
Exhaust rattle maybe? IS it any any acceleration or just cruising speed?
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Old Sep 27, 2016 | 09:38 PM
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2013 C300 Sport 4matic
Originally Posted by Atlas Grey
Exhaust rattle maybe? IS it any any acceleration or just cruising speed?
It happens only at cruising speed. Normal acceleration wise it is normal.
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Old Oct 5, 2016 | 09:00 AM
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2011 C300 4matic
Tranny or motor mounts maybe?
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