GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Blazer - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Positive Crankcase Ventilation Valve Replacement

Removal Procedure

    Object Number: 172995 Size: SH
  1. Disconnect the positive crankcase ventilation (PCV) valve hose assembly from the intake manifold.
  2. Disconnect the PCV valve hose from the valve rocker arm cover.

    3. Object Number: 516804 Size: SH
  3. Turn and remove the PCV valve cover from the upper intake manifold.
  4. Remove and discard the seal (O-ring).

Installation Procedure

    Object Number: 516804 Size: SH
  1. Install the PCV valve cover using the following procedure:
    2. 1.1. Install a NEW seal (O-ring) on the PCV valve cover.
    1.2. Lubricate the seal with clean engine oil.
    1.3. Install the PCV valve cover in the upper intake manifold.
    1.4. Turn and lock the PCV valve cover in position.

    Object Number: 172995 Size: SH
  2. Connect the PCV valve hose assembly to the valve rocker arm cover.
  3. Connect the PCV valve hose assembly to the intake manifold.