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Removal (4.8L, 5.3L & 6.0L)

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NOTE: The intake manifold, throttle body, fuel injection rail, and fuel injectors may be removed as an assembly. If not servicing the individual components, remove the manifold as a complete assembly.
NOTE: Numbers in parenthesis refer to numbers in illustrations.
  1. Remove the throttle body. See THROTTLE BODY . Remove the oil fill tube. Remove the fuel injectors. See FUEL RAIL & INJECTORS (SFI) .
  2. Disconnect the following electrical connectors: Manifold Absolute Pressure (MAP) sensor (1), knock sensor (2), Exhaust Gas Recirculation (EGR) valve if equipped. See Fig 1. Remove the knock sensor harness electrical connector from the intake manifold. Set the electrical harness aside.
  3. If equipped, remove the following EGR pipe bolts: Intake manifold (1), cylinder head (2) and exhaust manifold (3). See Fig 2. Remove the EGR pipe (with valve) and remove the EGR pipe gasket from the exhaust manifold.
  4. Remove the positive crankcase ventilation (PCV) hose (with valve). See Fig 3. Remove the MAP sensor (1) from the intake manifold. See Fig 4.
  5. Remove the accelerator control cable bracket bolts (1). Remove the accelerator control cable bracket (2) from the intake manifold. See Fig 5.
  6. Remove the evaporative emission (EVAP) purge solenoid vent tube by performing the following: Remove the EVAP tube end (1) from the solenoid (2). See Fig 6. Squeeze the EVAP pipe quick connect fitting (3) retainer together. Remove the EVAP tube end (3) from the vapor pipe.
  7. Remove the EVAP purge solenoid bolt (1), solenoid (2), and isolator (3) from the intake manifold. See Fig 7.
  8. Remove the intake manifold bolts. See Fig 8. Remove the intake manifold. Remove the intake manifold gaskets (1) from the intake manifold. See Fig 9. Discard the old intake manifold gaskets. Clean the gasket surfaces of the EGR pipe and the exhaust manifold, if equipped.
Fig 1: Disconnecting MAP Sensor & Knock Sensor (4.8L, 5.3L & 6.0L)
G00252076Courtesy of GENERAL MOTORS CORP.
Fig 2: Removing/Installing EGR Pipe Bolts (4.8L, 5.3L & 6.0L)
G00252077Courtesy of GENERAL MOTORS CORP.
Fig 3: Removing/Installing PCV Hose & Valve (4.8L, 5.3L & 6.0L)
G00252078Courtesy of GENERAL MOTORS CORP.
Fig 4: Removing/Installing MAP Sensor (4.8L, 5.3L & 6.0L)
G00252079Courtesy of GENERAL MOTORS CORP.
Fig 5: Removing/Installing Accelerator Control Bracket (4.8L, 5.3L & 6.0L)
G00252080Courtesy of GENERAL MOTORS CORP.
Fig 6: Removing/Installing EVAP Purge Solenoid Vent Tube (4.8L, 5.3L & 6.0L)
G00252081Courtesy of GENERAL MOTORS CORP.
Fig 7: Removing/Installing EVAP Purge Solenoid (4.8L, 5.3L & 6.0L)
G00252082Courtesy of GENERAL MOTORS CORP.
Fig 8: Removing/Installing Intake Manifold Bolts (4.8L, 5.3L & 6.0L)
G00252084Courtesy of GENERAL MOTORS CORP.
Fig 9: Removing/Installing Intake Manifold Gasket (4.8L, 5.3L & 6.0L)
G00252083Courtesy of GENERAL MOTORS CORP.
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