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Engine rapid "Rattle" under load, No rattle when clutch is engaged

  • 2003
  • 911 Carrera 4S
Mileage: 
105 000
Engine
Wake Forest, 
North Carolina

Vehicle: 2003 996 C4S

Mileage: 105,000

Lately I have been hearing a rapid "rattle" from the engine when accelerating or otherwise in gear (update: the rattle can be heard if reving in neutral, as well).  The rattle is audible even over the sport exhaust thought I would not say it gets loader with increased load; its just at such a frequency that you can seperate it from other noise.  The "funny" thing is that the rattle completely disapears when the clutch is engaged.  Notwithstanding the rattle, I do not have any other syptoms. 

Any ideas?

Thank you,

Matthew Smith

(you can hear it here, especially at the end of every rev: https://www.dropbox.com/s/3v9943ucmdmah5n/2014-11-03_08-18-03_156.wav?dl=0)

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