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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Mechanical - 5.3L (L83) Or 6.2L (L86) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Intake Manifold Replacement >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the battery ground cable. Refer to Battery Negative Cable Disconnection and Connection (Dual Battery)Battery Negative Cable Disconnection and Connection (Single Battery) .
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement (Chevrolet and GMC)Air Cleaner Outlet Duct Replacement (Cadillac) .
    3. Fig 1: Engine Wiring Harness Electrical Connectors
    GM3232365Courtesy of GENERAL MOTORS COMPANY
  3. Disconnect the engine wiring harness electrical connector (1) from the manifold absolute pressure (MAP) sensor.
  4. Disconnect the engine harness electrical connector (2) from the throttle actuator.
    5. Fig 2: EVAP Canister Purge Tube
    GM3232370Courtesy of GENERAL MOTORS COMPANY
  5. Disconnect the EVAP canister purge tube (1) quick connect fitting from the EVAP canister purge solenoid valve. Refer to Plastic Collar Quick Connect Fitting Service .
    6. Fig 3: Engine Harness Electrical Connector
    GM3239819Courtesy of GENERAL MOTORS COMPANY
  6. Disconnect the engine harness electrical connector (1) from the evaporative emission (EVAP) canister purge solenoid valve.
    7. Fig 4: Engine Harness Retainers
    GM3239820Courtesy of GENERAL MOTORS COMPANY
  7. Remove the engine harness retainers (1) from the intake manifold.
  8. Disconnect the center positive crankcase ventilation (PCV) hose from the intake manifold fitting and position aside. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement (Left Side - L83, L86) Positive Crankcase Ventilation Hose/Pipe/Tube Replacement (Right Side - L83, L86) Positive Crankcase Ventilation Hose/Pipe/Tube Replacement (Center - L83) Positive Crankcase Ventilation Hose/Pipe/Tube Replacement (Center - L86) .
    9. Fig 5: Engine Harness Retainers And Intake Manifold
    GM3239823Courtesy of GENERAL MOTORS COMPANY
  9. Remove the engine harness retainers (1) from the intake manifold.
    10. Fig 6: Intake Manifold Bolts
    GM3239826Courtesy of GENERAL MOTORS COMPANY
  10. Loosen the 10 intake manifold bolts (1) and position the manifold forward to gain access to the rear engine harness retainers.
    11. Fig 7: Engine Harness Retainers And Intake Manifold
    GM3239824Courtesy of GENERAL MOTORS COMPANY
  11. Remove the engine harness retainers (1) from the intake manifold.
    12. Fig 8: Power Brake Booster Vacuum Pipe Quick Connect
    GM4336256Courtesy of GENERAL MOTORS COMPANY
  12. Disconnect Power Brake Booster Vacuum Pipe Quick Connect (1)
    13. NOTE:

    The aid of an assistant may be helpful in holding the engine harness up out of the way so the upper intake manifold cover does not get caught against the engine harness.

  13. Remove the intake manifold.
  14. Cover the cylinder head passages in order to prevent dirt or debris from entering the passages.
    15. Fig 9: Intake Manifold Gaskets
    GM3239827Courtesy of GENERAL MOTORS COMPANY
  15. Remove and discard the intake manifold gaskets (1).
  16. Clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection .
  17. Transfer components as necessary.
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