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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1619 (Engine Mechanical - 4.8L, 5.3L & 6.0L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Intake Manifold Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: The intake manifold, throttle body, fuel rail, and injectors may be removed as an assembly. If not servicing the individual components, remove the manifold as a complete assembly.
  1. Remove the throttle body. Refer to THROTTLE BODY (4.8L, 5.3L and 6.0L). .
  2. Remove the fuel injectors. See FUEL RAIL AND INJECTORS in ENGINE CONTROLS - REMOVAL & INSTALLATION.
  3. Disconnect the following electrical connectors:
    • Manifold absolute pressure (MAP) sensor (1)
    • Knock sensor (2)
  4. Remove the knock sensor harness electrical connector from the intake manifold.
  5. Set the electrical harness aside.
    Fig 1: Manifold Absolute Pressure (MAP) Sensor & Knock Sensor
    G02106614Courtesy of GENERAL MOTORS CORP.
  6. If equipped with vacuum assisted brakes, remove the vacuum brake booster hose from the rear of the intake manifold.
    Fig 2: Removing Vacuum Brake Booster Hose
    G02106615Courtesy of GENERAL MOTORS CORP.
  7. Remove the positive crankcase ventilation (PCV) hose with valve.
    Fig 3: Removing PCV Hose
    G02106616Courtesy of GENERAL MOTORS CORP.
  8. Remove the MAP sensor (1) from the intake manifold.
    Fig 4: Removing MAP Sensor
    G02106617Courtesy of GENERAL MOTORS CORP.
  9. Remove the evaporative emission (EVAP) purge solenoid vent tube by performing the following:
    1. 9.1. Remove the EVAP tube end from the solenoid (1).
    2. 9.2. Remove the EVAP tube end from the vapor pipe (2).
    Fig 5: Solenoid & Vapor Pipe
    G02106618Courtesy of GENERAL MOTORS CORP.
  10. Remove the EVAP purge solenoid bolt (2), solenoid (3), and isolator (1) from the intake manifold.
    Fig 6: Removing EVAP Purge Solenoid, Bolt, & Isolator
    G02106619Courtesy of GENERAL MOTORS CORP.
  11. Loosen the intake manifold bolts.
  12. Remove the intake manifold.
    Fig 7: Removing Intake Manifold
    G02106620Courtesy of GENERAL MOTORS CORP.
  13. Remove the intake manifold gaskets (1) from the intake manifold.
  14. Discard the old intake manifold gaskets.
  15. If required, clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection .
    Fig 8: Removing Intake Manifold Gaskets
    G02106621Courtesy of GENERAL MOTORS CORP.
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