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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Mechanical - 5.7L (LS6)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Intake Manifold Removal

Intake Manifold Removal

WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
  • 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.
  • DO NOT use the intake manifold-to-cylinder head gaskets again.
    Fig 1: Manifold Absolute Pressure (MAP) Sensor
    GM58838Courtesy of GENERAL MOTORS CORP.
  1. Remove the manifold absolute pressure (MAP) sensor, if required.
    2. Fig 2: Installing/Removing Knock Sensor Wire Harness Connector Onto Fuel Rail Stop Bracket
    GM1272785Courtesy of GENERAL MOTORS CORP.
  2. Disconnect the knock sensor wire harness connector (1) from the fuel rail stop bracket (712).
    3. Fig 3: View Of Positive Crankcase Ventilation (PCV) Pipe - Dirty Air Hose
    GM1272790Courtesy of GENERAL MOTORS CORP.
  3. Remove the positive crankcase ventilation (PCV) pipe - dirty air (716) from the valley cover and intake manifold.
    4. CAUTION: Refer to Fuel Rail Stop Bracket Installation Caution in Cautions and Notices.
    Fig 4: Locating Fuel Rail Stop Bracket & Intake Manifold Bolts
    GM1272793Courtesy of GENERAL MOTORS CORP.
  4. Remove the intake manifold bolts (713) and fuel rail stop bracket (712).
    5. Fig 5: Locating Fuel Rail & Injectors
    GM1272783Courtesy of GENERAL MOTORS CORP.
  5. Note the location of the fuel rail ground strap (550) on the intake manifold.

    The fuel rail ground strap must be installed during assembly.

    6. Fig 6: View Of Intake Manifold & Engine
    GM639836Courtesy of GENERAL MOTORS CORP.
  6. Remove the engine coolant air bleed pipe hose from the throttle body.
  7. Remove the intake manifold.
    8. Fig 7: View Of Intake Manifold-To-Cylinder Head Gaskets
    GM1272799Courtesy of GENERAL MOTORS CORP.
  8. Remove the manifold-to-cylinder head gaskets (514) from the intake manifold.
  9. Discard the intake manifold gaskets.
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