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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 WIRE 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: Twist the spark plug boot one-half turn in order to release the boot. Pull on the spark plug boot only. Do not pull on the spark plug wire or the wire could be damaged.
    Fig 1: View Of Left Side Spark Plug Wires
    GM1774994Courtesy of GENERAL MOTORS CORP.
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  2. Disconnect the left side spark plug wires from the spark plugs.
  3. Disconnect the left side spark plug wires from the ignition coil.
  4. Remove the spark plug wire clips from the manifold absolute pressure (MAP) sensor bracket and the heater inlet and outlet pipe tab.
  5. Remove the spark plug wire assembly.
  6. If replacing only one plug wire, open the retaining clips and remove the appropriate spark plug wire.
    7. Fig 2: View Of Spark Plug Wire Assembly
    GM1798989Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the right side spark plug wires from the spark plugs.
  8. Disconnect the right side spark plugs from the ignition coils.
  9. Remove the spark plug wire assembly.
  10. If replacing only one plug wire, open the retaining clip and remove the appropriate spark plug wire.
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.