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Home >> Chevrolet >> 2017 >> SS Standard Trans >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical - 6.2L (LS3) >> Repair Instructions - On Vehicle >> Intake Manifold Replacement >> Removal Procedure

Removal Procedure

    NOTE:

    The intake manifold, throttle body, fuel injection 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 engine cover. Refer to Engine Cover Replacement .
  2. Depressurize the fuel system. Refer to Fuel Pressure Relief .
  3. Disconnect the battery ground cable. Refer to Battery Negative Cable Disconnection and Connection .
  4. Drain the cooling system. Refer to Cooling System Draining and Filling .
  5. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
    6. Fig 1: Heater Hoses & Intake Manifold
    GM3248484Courtesy of GENERAL MOTORS COMPANY
  6. Reposition and secure the heater hoses (1) away from the intake manifold (2).
    7. Fig 2: Fuel Rail Tube & Feed Pipe (Left Side)
    GM1954084Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Plug or cap the fuel feed pipe (2) and fuel rail tube (1) ends to prevent fuel leaks and/or contamination.

  7. Disconnect the fuel rail feed pipe (2) quick connect fitting. Refer to Metal Collar Quick Connect Fitting Service , or Plastic Collar Quick Connect Fitting Service .
    8. Fig 3: Locating Fuel Tank Hose, EVAP Purge Valve & Hose
    GM1954083Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Plug or cap the throttle body to EVAP purge valve hose (3) and EVAP purge valve (1) ends to prevent fuel leaks and/or contamination.

  8. Disconnect the throttle body to EVAP purge valve hose (3) from the EVAP purge valve (1).
    9. NOTE:

    Plug or cap the EVAP purge valve to fuel tank hose (2) and EVAP purge valve (1) ends to prevent fuel leaks and/or contamination.

  9. Disconnect the EVAP purge valve to fuel tank hose (2) from the EVAP purge valve (1).
    10. Fig 4: Electronic Throttle Body Wiring Harness Connector
    GM1954085Courtesy of GENERAL MOTORS COMPANY
  10. Disconnect the electronic throttle body wiring harness connector (1).
    11. Fig 5: Locating PCV Hose, Intake Manifold & Valley Cover
    GM1954091Courtesy of GENERAL MOTORS COMPANY
  11. Disconnect the positive crankcase ventilation (PCV) hose (3) from the intake manifold (1) and the valley cover (2).
    12. Fig 6: Alternator Wiring Harness Connector
    GM1954054Courtesy of GENERAL MOTORS COMPANY
  12. Disconnect the alternator wiring harness connector (1) from the alternator.
    13. Fig 7: Intake Manifold Vacuum Port, Vacuum Hose & Retaining Clamp
    GM1946557Courtesy of GENERAL MOTORS COMPANY
  13. Compress the vacuum hose retaining clamp (2) at the intake manifold vacuum port (1) and slide 50 mm (2 in) back along the vacuum hose (3).
  14. Disconnect the vacuum hose (3) from the intake manifold vacuum port (1).
    15. Fig 8: HVAC Vacuum Hose & Oil Pressure Sensor Wiring Harness Connector
    GM1954090Courtesy of GENERAL MOTORS COMPANY
  15. Disconnect the oil pressure sensor wiring harness connector (1) from the oil pressure sensor.
  16. Disconnect the HVAC vacuum hose (2) from the intake manifold.
    17. Fig 9: Camshaft Position Sensor Connector, Coolant Temperature Sensor Connector & Engine Lifting Bracket
    GM1954088Courtesy of GENERAL MOTORS COMPANY
  17. Disconnect the camshaft position sensor connector (4) from the camshaft position sensor.
  18. Disconnect the coolant temperature sensor connector (3) from the coolant temperature sensor.
  19. Detach the wiring harness retaining clip (2) from the engine lifting bracket (1).
    20. Fig 10: Left Side Fuel Injector Wiring Harness Connectors
    GM1954086Courtesy of GENERAL MOTORS COMPANY
  20. Disconnect the left side fuel injector wiring harness connectors (2) from the fuel injectors.
  21. Remove the connector position assurance (CPA) lock (4) from the left side ignition coil main connector (3).
  22. Disconnect the left side ignition coil main connector (3) from the ignition coil wiring harness.
  23. Reposition and secure the left side fuel injector wiring harness (5) away from the intake manifold (1).
    24. Fig 11: Right Side Fuel Injector Wiring Harness Connectors
    GM1954087Courtesy of GENERAL MOTORS COMPANY
  24. Disconnect the right side fuel injector wiring harness connectors (1) from the fuel injectors.
  25. Remove the CPA lock (7) from the right side ignition coil main connector (6).
  26. Disconnect the right side ignition coil main connector (6) from the ignition coil wiring harness.
  27. Disconnect the canister purge valve (5) wiring harness connector.
  28. Disconnect the manifold absolute pressure (MAP) sensor wiring harness connector (3) from the MAP sensor.
  29. Reposition and secure the right side fuel injector wiring harness (4) away from the intake manifold (2).
    30. Fig 12: Intake Manifold To Cylinder Head Retaining Bolt Tightening Sequence
    GM2148885Courtesy of GENERAL MOTORS COMPANY
    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:

    Removal of the intake manifold to cylinder head retaining bolts (1) should be performed in sequence. Failing to do so may distort the intake manifold.

  30. Remove the intake manifold to cylinder head retaining bolts (1) in sequence.
    31. Fig 13: Locating Intake Manifold & Engine
    GM2030064Courtesy of GENERAL MOTORS COMPANY
  31. Remove the intake manifold (1) from the engine (2).
  32. Plug the engine (2) with a clean lint free cloth.
    33. Fig 14: Intake Manifold To Cylinder Head Gaskets
    GM1954080Courtesy of GENERAL MOTORS COMPANY
  33. Remove the intake manifold to cylinder head gaskets (1).

    Discard the intake manifold to cylinder head gaskets (1).

  34. Clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection .
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