Broglen

So i have this issue on my C63s Coupé.
A whining noise (almost like a supercharger sound) that comes only during hard accelerations and are most noticeable from 1st,2nd and 3rd gear. I can also hear some sort of whine or like something is rubbing (like a belt or something) if i drive in a corner a little bit harder.

confirmed by a few people that have driven these that this is not normal.
Suggestions?

Behind The Bibs

https://mbworld.org/forums/c63-c63s-...ml#post8354923

Have a read and look at the links in the thread, think quite a few of us are experiencing similar

Broglen

Thank you!
Do you have a sound clip to show?

Behind The Bibs

No sound clip sorry, I’ve convinced myself it’s the diverter valves.

Tried to explain the situation at the dealership but extremely difficult to replicate so ultimately gave up, no loss of power so I’ve learnt to live with this and ‘noises’

Broglen

Hmm okey!

Do you also get the same sound when you corner hard? Because i also get this kind of strange noise when cornering hard

shane060

Im getting a weird whine or like heeeeee sound during wot 3rd gear redline upshifts in sport plus and race mode. Sounds like others have experienced it but no solution or answer as to what it is?

Broglen

hello!
the problem for me got solved.
mechanic told me that previous service they put the plug a little wrong so there was a tiny hole that leaked tiny amount of oil and maybe was the issue to causing air or something to get inside.

they droppet trans oil pan and searched trough for any damage, no damage, so did a full transmission oil service and the sound was gone. It took us a few attempts to try to find the issue though

shane060

Very interesting. Was your sound coming from the trans or did it sound like it was coming from the engine, more so like from behind the drivers side dash area where the top of the intake and engine area was?

Broglen

It sounded like it came from the engine bay/ slightly under me.

they put mics around turbos,engine, intake and sat with headphones listening when i drove the car.

when i floored it / cornered hard, the sound came. They Did not find anything wrong on those test but then connected it to the trans where they heard that sound more and so it began.

shane060

So a full transmission service fixed the sound heh. Was this just new transmission oil or the entire kit including new filter, gasket plug, pan oil etc?

Broglen

this was all, a normal transmission service from MB