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Home >> Cadillac >> 2011 >> STS AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls And Fuel - 3.6L - Repair Instructions >> Repair Instructions >> Fuel Injection Fuel Rail Assembly Replacement - Bank 2 >> Installation Procedure
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Installation Procedure

    Fig 1: Identifying Rebuilt Direct Fuel Injectors
    GM1977754Courtesy of GENERAL MOTORS COMPANY
  1. Install the rebuilt direct fuel injectors (1) to the cylinder heads. Refer to Fuel Injector Replacement .
  2. Install new direct injector hold down clamps to the injectors.
    3. Fig 2: Identifying Fuel Rail & Bolts
    GM1977744Courtesy of GENERAL MOTORS COMPANY
  3. On the new fuel rail, lubricate the fuel injector cups with silicon free engine oil GM P/N 12345610 (Canadian P/N 9931930) or equivalent.
  4. Carefully place the fuel rail (2) into position, placing the front into the fuel rail over the front injector and rotating the rear downward.
  5. Install the 2 outer fuel rail bolts first, then the 2 inner bolts and hand tighten.
    6. Fig 3: Identifying Fuel Rail Bolt Tightening Sequence
    GM1977774Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

  6. Tighten the fuel rail bolts in the sequence shown:

    Tighten 

    1. Tighten the Bank 1 fuel rail bolts first pass to 12 N.m (106 lb in).
    2. Tighten the Bank 1 fuel rail bolts a final pass to 23 N.m (17 lb ft).
  7. Install a NEW fuel rail crossover pipe. Refer to Fuel Injection Fuel Rail Crossover Tube Replacement .
    8. Fig 4: Identifying Fuel Pressure Sensor & Fuel Injection Fuel Rail
    GM1977753Courtesy of GENERAL MOTORS COMPANY
  8. Install the high pressure fuel sensor. Refer to Fuel Pressure Sensor Replacement .
    9. CAUTION:

    Note the correct routing of the electrical wiring. Failure to reinstall the wiring properly could result in damage to the wiring.

  9. Connect the fuel injector wiring harness electrical connector (1) from the fuel injectors, fuel rail and fuel pressure sensor.
  10. Inspect for fuel leaks using the following procedure:
    1. Turn ON the ignition, with the engine OFF for 2 seconds.
    2. Turn OFF the ignition, for 10 seconds.
    3. Turn ON the ignition, with the engine OFF.
    4. Inspect for fuel leaks.
  11. Install the fuel pipe shield. Refer to Fuel Pipe Shield Replacement .
  12. Install the low side fuel pressure service port cap.
  13. Install the fuel tank cap.
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