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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 143 (ENGINE CONTROLS AND FUEL - 3.5L - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSSPARK PLUG REPLACEMENTREMOVAL PROCEDURE
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Removal Procedure

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Removal Procedure
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Observe the following service precautions:
  • Allow the engine to cool before removing the spark plugs. Attempting to remove spark plugs from a hot engine can cause the spark plugs to seize. This can damage the cylinder head threads.
  • Clean the spark plug recess area before removing the spark plug. Failure to do so can result in engine damage due to dirt or foreign material entering the cylinder head, or in contamination of the cylinder head threads. Contaminated threads may prevent proper seating of the new spark plug.
  • Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the vehicle. Installing spark plugs of another type can severely damage the engine.
    Fig 1: View Of Left Side Spark Plug Wires
    GM1774994Courtesy of GENERAL MOTORS CORP.
  1. Remove the intake manifold cover, if required. Refer to Intake Manifold Cover Replacement .
  2. Remove the air cleaner outlet duct, if required. Refer to Air Cleaner Outlet Duct Replacement .
  3. Remove the left side spark plug wires from the spark plugs, if required.
    4. Fig 2: View Of Spark Plug Wire Assembly
    GM1798989Courtesy of GENERAL MOTORS CORP.
  4. Remove the right side spark plug wires from the spark plugs, if required.
    5. Fig 3: Identifying Spark Plugs
    GM1587748Courtesy of GENERAL MOTORS CORP.
  5. Remove the spark plugs from the engine.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.