FixVault

2. Check Intake Air Leak

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine and let it idle.
  2. Listen for an intake air leak after the mass air flow sensor.

OK or NG 

  1. OK: GO TO 3.
  2. NG: Discover air leak location and repair.