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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Mechanical - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Engine Compression Test >> Preliminary Procedures

Preliminary Procedures

WARNING: This page is about a different variant/trim than selected.
  1. GM5171779Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Cover Bolt (1) - Remove

  2. Intake Manifold Cover (2) - Remove
  3. GM5149847Courtesy of GENERAL MOTORS COMPANY

    Clamp (1) - Loosen [2x]

  4. Charge Air Cooler Outlet Air Hose (2) - Remove
  5. GM5149848Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Do NOT disconnect the throttle body electrical connector.

    Throttle Body Bolt (3) - Remove [3x]

  6. Throttle Body (1) - Position aside
  7. Throttle Body Gasket (2) - Remove and DISCARD
  8. GM5480505Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (1) @Glow Plug - Disconnect [6x]

  9. GM5480507Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Ensure each glow plug is fully intact when removed from the cylinder head. A broken tip could remain within the combustion chamber, which may not be obvious during removal. Damage to the engine may result if a broken glow plug tip remains within the engine.

    NOTE:
    • Glow plugs must be discarded whenever removed, and replaced with NEW.
    • Handle with extreme care, do not allow glow plugs to touch each other.
    • Do not use power tools to install glow plugs.
    • Use a suitable, commercially available glow plug socket.
    • Cylinder head removal may be required to retrieve a broken tip.

    Glow Plug (1) - Remove [6x]

  10. Inspect each glow plug tip and ensure the glow plug is not broken. If a broken tip is suspected, inspect the combustion chamber for the glow plug tip.
  11. Fuel Pump Relay - Remove
  12. WARNING:

    Refer to Eye Protection Warning .

  13. Crank the engine with the starter motor for 5 seconds to remove any foreign substances from the cylinders.
  14. GM5149855Courtesy of GENERAL MOTORS COMPANY

    Install the EN-26999  Compression Gauge and EN-46722  Compression Gauge Adapter in the glow plug hole for the cylinder being checked.