GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 Envoy - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Positive Crankcase Ventilation Hose/Pipe/Tube Replacement

Removal Procedure

    Object Number: 874375 Size: SH
  1. Remove the positive crankcase ventilation (PCV) foul air hose (1) and valve (2) from the intake manifold and valve rocker arm cover.
  2. Remove the PCV valve (2) from the PCV tube (1).

    3. Object Number: 647795 Size: SH
  3. Remove the PCV fresh air hose from the throttle body and the valve rocker arm cover.

Installation Procedure

    Object Number: 647795 Size: SH
  1. Install the PCV fresh air hose to the throttle body and the valve rocker arm cover.

    2. Object Number: 874375 Size: SH
  2. Install the PCV valve (2) to the tube (1).
  3. Install the PCV foul air hose (1) and valve (2) to the intake manifold and valve rocker arm cover.