Originally Posted by AMGLover
First see if you can get them to download any codes. When you are in first and accelerate to 2,500 you are still in first...correct?! Then try it in W mode since it starts you in second from a dead stop. If you accelerate slowly from a stop and get to 2,500 rpm the SC might never engage...or should not. The SC does draws 60 hp from the engine so if it were engaging at the wrong time it would cause a BIG lag! That said it would not be a clutch issue but an ECU issue. Have them do:
TBS: 25-Aug-06 - 08-030-06A - Engine Control - PCM Initialization Procedure
See if that helps.
Thanks. Happens mostly in 2nd gear around 2,500 rpm. It does it in W mode as well. Pretty sure it is the SC engaging, but I think it should be smoother and not make the chirp sound. SC clutch problem maybe. I'm taking it in on Wednesday. I'll definitely mention the TSB you mentioned as well as the condensation in the headlights issue.