GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Monte Carlo 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 Crankcase Ventilation System Inspection

Removal Procedure
  1. Remove the Fuel Injector Sight Shield. Refer to Fuel Injector Sight Shield Replacement in engine mechanical.

    2. Object Number: 12315 Size: MH
  2. Remove the MAP sensor (1).
  3. Use a 16 mm socket to press the access cover (2) down and rotate 1/4 turn counterclockwise.
  4. Remove the access cover.
  5. Remove the PCV valve (3) and the O-ring (4) from the intake manifold.

Installation Procedure

    Object Number: 12315 Size: MH
  1. Install the crankcase ventilation valve; replace the O-ring if necessary.
  2. Install the access cover.
  3. Install the MAP sensor.
  4. Reinstall the Fuel Injector Sight Shield. Refer to Fuel Injector Sight Shield Replacement in engine mechanical.