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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSFUEL INJECTOR REPLACEMENT (LEFT)INJECTOR BORE CLEANING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Injector Bore Cleaning

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Injector Bore Cleaning
WARNING: This page is about a different variant/trim than selected.
IMPORTANT: The procedure below will aid in the cleaning of carbon deposits from the injector sleeve during an injector replacement
    Fig 1: View Of Left Fuel Injectors W/Brackets
    GM1335621Courtesy of GENERAL MOTORS CORP.
  1. Install the EN-47909-2 Radial Brush (brass), to the EN-47909-1 Handle Assembly.
  2. Insert the brush into the injector bore and rotate the handle in order to break loose any carbon deposits from the injector bore walls and the combustion deck hole.
    3. CAUTION: Wear safety glasses in order to avoid eye damage.
  3. Using compressed air, evacuate any debris from the injector bore.
  4. Remove the radial brush from the handle assembly.
  5. Install the EN-47909-3 Axial Brush (nylon), to the EN-47909-1.
  6. Insert the axial brush into the injector bore and rotate the handle while also applying a slight downward pressure, in order to force the brush ends into the bottom corners of the injector bore.
    7. CAUTION: Wear safety glasses in order to avoid eye damage.
  7. Using compressed air, evacuate any debris from the injector bore.
    8. NOTE: Do not allow excessive amounts of solvent to go into the cylinder during cleaning. Failure to do so may cause engine damage upon startup.
  8. Lightly dampen EN-47909-20 Cotton Swab with Top Engine Cleaner, GM P/N 1052626 (Canadian P/N 993026) or equivalent, and wipe away any deposits from the injector bore.
  9. Inspect the injector bore for any deposits and repeat brushing if necessary.
    10. CAUTION: Keep hands and face clear of glow plug holes while cranking. Hot liquid or gases may be expelled during cranking.
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.