VIN 6
Fuel Injector Replacement (Right)
Special Tools
* EN-47909 Injector Bore and Sleeve Cleaning Kit
* J-46594 Fuel Injector Puller
Removal Procedure
1. Remove the upper right valve cover. Refer to Valve Rocker Arm Upper Cover Replacement - Right Side (LMM) (Valve Rocker Arm Upper Cover Replacement - Right Side).
2. Remove the fuel injector bracket bolts.
3. Install J-46594 into the bolt hole in the fuel injector bracket.
4. Install a flare nut wrench onto J-46594 and pull back away from the fuel injector, until the injector releases from its seat.
5. Remove the J-46594.
Note: The unique fuel injector flow rates are programmed into the ECM according to cylinder location. Mark the injectors for correct re-installation to the same cylinders. Failure to do so may result in a poor driveability condition.
6. Remove the fuel injectors with brackets.
7. Remove and discard the copper washer from the fuel injector bore.
8. Remove and discard the fuel injector O-ring from the injector.
Fuel Injector Cleaning and Inspection
Note: If reusing the old injectors perform the following:
1. Use a soft bristle non-metallic brush and Top Engine Cleaner, GM P/N 1052626 or equivalent, to remove any deposits from the nozzle tip (1) and the copper washer sealing area (2) before re-installation.
2. Inspect the fuel injector nozzle tip (1) for any signs of discoloration (dark yellow, tan or blue) due to excessive heat.
3. Replace the injector if any damage is found.
4. Clean the fuel injector high pressure line.
5. Inspect the fuel injector line for excessive corrosion or damage to the sealing surfaces (1, 2). Replace the line if any damage is found.
Injector Bore Cleaning
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.
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.
Warning
Wear safety glasses in order to avoid eye damage.
7. Using compressed air, evacuate any debris from the injector bore.
Caution: Do not allow excessive amounts of solvent to go into the cylinder during cleaning. Failure to do so may cause engine damage upon start-up.
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.
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 (Glow Plug Replacement - Bank 1) and/or Glow Plug Replacement - Bank 2 (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 (Glow Plug Replacement - Bank 1) and/or Glow Plug Replacement - Bank 2 (Glow Plug Replacement - Bank 2).
Installation Procedure
1. Install a NEW copper washer to the fuel injector bore.
2. Install a NEW fuel injector O-ring to the injector.
Caution: Refer to Fastener Caution (Fastener Caution).
3. Install the fuel pressure regulator bracket nut and bolt and tighten to 10 Nm (89 lb in).
4. Install the upper right valve cover. Refer to Valve Rocker Arm Upper Cover Replacement - Right Side (LMM) (Valve Rocker Arm Upper Cover Replacement - Right Side).
5. If the fuel injectors were replaced, refer to Fuel Injector Flow Rate Programming (Procedures).
6. Prime the fuel system. Refer to Fuel System Priming (Fuel System Priming).
7. Start the engine. If the engine stalls, repeat the above step.
8. Once the engine starts, inspect for fuel leaks.
9. Install the engine cover. Refer to Engine Cover Replacement (Service and Repair).