MartinWake

Hello guys I have not been driving my car too much but when I do I like to downshift to hear the exhaust anyways I have noticed the whining sound that usually happens on all auto cars when downshifting is a little louder then usual. I will post two video links with the sound, hopefully you guys can hear it and point me in the right direction. I suspect its the transmission because it does not happen in park or neutral. My car is a CL55 AMG

Thanks!



Edit, it does do it in park but it has always done this sound
⁠https://youtu.be/ul23BggiMOI⁠
⁠
⁠https://youtu.be/EESooOzRRTc⁠
⁠
one video is next to a wall the other is not

After further research I am now thinking it could be abc related? I check my fluid level everyday and it does not drop. I have also replaced the front abc accumulator when I got the car.

tim687

It honestly sounds like a supercharger of somesort.
Have someone hit the gas whilest you're listing with the hood open is my suggestion

MartinWake

I did it does not sound like that from the front, I think the problem is one of the abc accumulators from what I read..

tim687

Whilest researching the symptoms that I currently have, I stumbled upon this
https://mbworld.org/forums/m275-v12-...ml#post6759027

Good luck!

MartinWake

Changed the abc pulsation damper and the sound is still there

MartinWake

Alright I took off the pan and I do not see any flakes of metal. The filter is also clean. Could it just be the conductor plate now? It did every symptom of that.

Video 1:
Video 2:

ChrisVannoy

Could be torque converter