GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC Suburban - 4WD 🢒 Engine 🢒 Engine Mechanical - 7.4L 🢒 Intake Manifold Disassemble

Upper Intake Manifold

    Object Number: 68506 Size: SH
  1. Remove the ignition coil bolt and stud.
  2. Remove the ignition coil.

    3. Object Number: 18299 Size: SH
  3. Remove the throttle body nuts.

    4. Object Number: 18302 Size: SH
  4. Remove the throttle body.

    5. Object Number: 18303 Size: SH
  5. Remove the throttle body gasket.
  6. Remove the throttle body studs, if required.

    7. Object Number: 276413 Size: SH

    Important: Note the position of the EGR valve before removal. It is possible to improperly install the EGR valve 180 degrees from the original position.

  7. Remove the EGR valve bolts.

    8. Notice: The Linear EGR valve is an electrical component. DO NOT soak in any liquid cleaner or solvent because damage may result.

  8. Remove the EGR valve.
  9. Remove the EGR gasket.

    10. Object Number: 351775 Size: SH
  10. Remove the EVAP purge valve bolts.
  11. Remove the EVAP purge valve.

    12. Object Number: 354044 Size: SH
  12. Remove the secondary air injection check valve bracket bolt and bracket, if required (RPO K19 only).

Lower Intake Manifold

    Object Number: 19673 Size: SH
  1. Remove the MAP sensor nut, retainer and the MAP sensor.

    2. Object Number: 19162 Size: SH
  2. Remove the fuel rail bolts and stud.

    3. Object Number: 19164 Size: SH
  3. Remove the fuel rail.

    4. Object Number: 65322 Size: SH
  4. Remove the water inlet housing bolts, housing, and thermostat.
  5. Remove the coolant temperature sensor from the lower intake manifold.