GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Seville 🢒 Engine 🢒 Engine Mechanical - 4.6L 🢒 Intake Manifold Removal

    Object Number: 205499 Size: SH
  1. Remove the intake manifold sight shield (1).

    2. Object Number: 71512 Size: SH
  2. Disconnect the spark plug wires from the left bank spark plugs and the molded retainers in the intake manifold. Lay the wires aside.

    3. Object Number: 205668 Size: SH
  3. Disconnect the dirty air PCV tube (1) from the PCV valve (2) and the intake manifold.
  4. Remove the dirty air PCV tube.

    5. Object Number: 331797 Size: SH
  5. Disconnect the fresh air PCV tube (1) from the camshaft cover and the intake manifold.
  6. Remove the fresh air PCV tube.

    7. Object Number: 53639 Size: SH
  7. Disconnect the EGR and crankcase ventilation pipe at the throttle body spacer.

    8. Object Number: 211443 Size: SH
  8. Disconnect the fuel rail ground wire at the rear cylinder head.

    9. Object Number: 205470 Size: SH
  9. Disconnect the fuel rail bracket (1) retaining bolt (3) at the rear lift bracket (4).

    10. Object Number: 211444 Size: SH
  10. Remove the purge solenoid harness by removing the retaining bolt and disconnecting from the intake manifold.

    11. Object Number: 205490 Size: SH
  11. Disconnect the throttle body heater hose (3) from the water crossover (4).

    12. Object Number: 206305 Size: SH
  12. Disconnect the generator coolant inlet hose (1) from the throttle body heater outlet pipe and remove the tube (2) from the intake manifold studs.

    13. Object Number: 206312 Size: SH
  13. Disconnect the throttle body heater outlet hose (1) from the throttle body (3) and remove the coolant overflow pipe (5) from the intake manifold studs (4).

    14. Object Number: 331856 Size: SH
  14. Loosen and remove the intake manifold studs (1), spacers (2) and bolts (3) .
  15. Remove the intake manifold assembly.

    16. Important: The intake manifold carrier gaskets are attached to the intake manifold through a snap-lock feature. When you remove the intake manifold, the carrier gaskets will remain attached to the manifold. It is not necessary to replace the gaskets unless there is damage to the seals.