GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 Envoy - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.2L 🢒 Positive Crankcase Ventilation Hose/Pipe/Tube Replacement

Removal Procedure

    Object Number: 637635 Size: SH
  1. Disconnect the crankcase dirty air hose from the intake manifold.
  2. Disconnect the crankcase dirty air hose from the positive crankcase ventilation (PCV) orifice tube.

    3. Object Number: 732051 Size: SH
  3. Loosen the throttle body clamps (2).
  4. Disconnect the fuel pressure regulator vacuum supply hose from the air cleaner outlet resonator.

    5. Object Number: 730135 Size: SH
  5. Remove the 2 resonator to engine bolts (4) from the air cleaner outlet resonator (5).

    6. Object Number: 1226040 Size: SH
  6. Lift up the front of the air cleaner outlet resonator (2).
  7. Disconnect the crankcase clean air hose from the valve cover port.
  8. Disconnect the crankcase clean air hose from the air cleaner outlet resonator (2).

Installation Procedure

    Object Number: 1226040 Size: SH
  1. Connect the crankcase clean air hose to the air cleaner outlet resonator (2).
  2. Connect the crankcase clean air hose to the valve cover port.

    3. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 730135 Size: SH
  3. Install the 2 resonator to engine bolts (4) to the air cleaner outlet resonator (5).

    4. Tighten
    Tighten the bolts to 6 N·m (53 lb in).


    Object Number: 732051 Size: SH
  4. Tighten the throttle body clamps (2).

    5. Tighten
    Tighten the clamps to 4 N·m (35 lb in).

  5. Connect the fuel pressure regulator vacuum supply hose to the air cleaner outlet resonator.

    6. Object Number: 637635 Size: SH
  6. Lubricate the inner diameter of the crankcase ventilation hose. Refer to Adhesives, Fluids, Lubricants, and Sealers for the correct part number.
  7. Connect the crankcase dirty air hose to the intake manifold.
  8. Connect the crankcase dirty air hose to the PCV orifice tube.