Fuel Injector and Fuel Injector Bore Cleaning and Inspection

Special Tools 

EN-47909  Injector Bore and Sleeve Cleaning Kit

For equivalent regional tools, refer to Special Tools .

1. For this operation the fuel injector rail, the fuel injector and the fuel injector seals are removed.
2. Use the EN-47909  cleaning kit (1) to clean the fuel injector bores.
   Fig 1: Cleaning Fuel Injector Bores

   Courtesy of GENERAL MOTORS COMPANY
3. Clean the exterior of the fuel rail (1) and injectors in solvent.
   Fig 2: Fuel Rail

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: Do not soak or submerge the fuel rail or injectors in solvent.
4. Remove the clip (2) and disconnect the wiring harness plug (3).
5. Remove the fuel injection fuel rail pressure fuel sensor (4).
6. Inspect the fuel injection fuel rail pressure fuel sensor (4) for damage.
   CAUTION: Refer to Fastener Caution .
   1. If replacing, dry the fuel pressure sensor bore in the fuel rail with a lint free cloth.
   2. The bore should be free of fuel, debris and burrs.
   3. Lubricate the fuel pressure sensor bore, in the fuel rail, with clean engine oil.
   4. Lubricate the threads and sealing area on the fuel pressure sensor with clean engine oil.
   5. Install the fuel pressure sensor hand tight.
   6. Remove the fuel pressure sensor and re-lubricate the bore, threads and sealing area.
   7. Re-install the fuel pressure sensor. Tighten the fuel injection fuel rail pressure fuel sensor to 30 N.m (22 lb ft).
7. Inspect the fuel rail and components for the following conditions:
   • Damage, debris or restrictions to the fuel rail
   • Damage, debris or restrictions to the fuel ports in the fuel rail
   • Damage to the mounting area for the fuel rail
   • Damage to the fuel rail mounting bolts
   • Damage to the threads on the fuel rail fuel feed fitting
8. Inspect the fuel injectors for the following conditions:
   Fig 3: Fuel Injector Inspection Points

   Courtesy of GENERAL MOTORS COMPANY
   • Damage to the fuel injector connector O-ring (1)
   • Damage to the fuel injector plastic spacer (2)
   • Damage to the fuel injector connector (3)
   • Damage to the fuel injector harness connector
   • Damage to the tolerance ring (4)
   • Damage to the fuel injector shaft (5)
   • Damage to the fuel injector tip (6)
   • Damage to the fuel injector sealing surfaces (7)
9. Replace the fuel rail or injector if any damage is found. Do not attempt to repair a fuel rail or injector.
10. Clean the fuel injector shaft and fuel injector sealing surfaces (2) from gasoline exhaust particulates and sealing deposit with a brass brush (1) and a lint free cloth in the direction of the arrow.
    Fig 4: Cleaning Fuel Injector Shaft And Fuel Injector Sealing Surfaces

    Courtesy of GENERAL MOTORS COMPANY
    CAUTION: Clean the fuel injectors with a copper brush and a lint free cloth in the direction of the injector opening. Do not contaminate the opening. Contamination of the injector opening can lead to a fuel injection system malfunction.
11. Repeat the fuel injector cleaning and inspection process for all 4 fuel injectors.