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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1306 (Engine Controls And Fuel - 6.6L - Introduction (1 Of 2)) >> Repair Instructions >> Fuel Injector Replacement (Left) >> Injector Bore Cleaning

Injector Bore Cleaning

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The procedure below will aid in the cleaning of carbon deposits from the injector sleeve during an injector replacement
  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. WARNING: 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. WARNING: Wear safety glasses in order to avoid eye damage.
  7. Using compressed air, evacuate any debris from the injector bore.
    8. CAUTION: 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. WARNING: Keep hands and face clear of glow plug holes while cranking. Hot liquid or gases may be expelled during cranking.
    WARNING: Wear safety glasses in order to avoid eye damage.
  10. If necessary, crank the engine in order to expel any solvent before starting the engine.
    1. Remove the glow plugs. Refer to Glow Plug Replacement - Bank 1  and/or Glow Plug Replacement - Bank 2 .
    2. Disable the fuel system.
    3. Disconnect the crankshaft position (CKP) sensor electrical connector.
    4. Crank the engine in order to expel any excessive solvent.
    5. Using the cotton swabs supplied with the kit, wipe the injector bore clean of any solvent and/or debris.
    6. Connect the CKP sensor electrical connector.
    7. Enable the fuel system.
    8. Reinstall the glow plugs. Refer to Glow Plug Replacement - Bank 1  and/or Glow Plug Replacement - Bank 2 .
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