2012 S63 with with weistec race tune 700hp. Runs perfect except high rev, mostly manual driving, a loud vibration type noise occurs after throttle let off. The noise remains for several minutes of conservative driving, even coasting, and goes away after awhile, only returning again after spirited driving.


Thinking either belt/pulley issue somewhere or excessive turbo pressure creating surge, although surge doesnt usually last as long as this does. Or trans, or driveshaft, or...? Help!


I can slightly feel it under foot, very slight...thanks!




Can you dublicate the issue is you are parked and rev up the engine?

If you can, I would take off the serpentine belt and see if you can dublicate it with the belt off.

If the noise goes away it is a issue with the accessories / ac/ alternator/ tensioer.

If the noise remains, you have a internal engine issue.


Plain text

  • Allowed HTML tags: <a href hreflang> <em> <strong> <cite> <blockquote cite> <code> <ul type> <ol start type='1 A I'> <li> <dl> <dt> <dd> <h2 id='jump-*'> <h3 id> <h4 id> <h5 id> <h6 id>
  • No HTML tags allowed.
  • Lines and paragraphs break automatically.
  • Only images hosted on this site may be used in <img> tags.
The content of this field is kept private and will not be shown publicly.

Disclaimer: Youcanic has made every effort to assure the accuracy of the information on this page. Neither Youcanic nor its affiliates assume responsibility for any loss or damage due to any errors, omissions, lack of information. You agree to hold Youcanic free from any liability arising out of the use of any information contained within. All pictures and references to trademarks and car names are for reference only and do not imply an association with the manufacturer. Consult your owner's manual or authorized factory manuals when performing repair procedures. By entering this site, you agree to our Terms & Conditions and Privacy Polity.