I have 2010 cl550, has mysteriously making rotation noise only when it’s accelerating, when I take gas paddle off, noise disappears. I went to two different shops and no one can figure out. Anyone had similar experience/ advise on what to check. Nothing is scraping for sure (obvious things like bread cover ). Any help will be appreciated

 

Would you be able to post video of the sound? I also have a 2010 CL550, and posted a video of a sound mine is making.