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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1137 (Engine Controls And Fuel - 3.6L - Introduction (2 Of 2)) >> Repair Instructions >> Fuel Injector Replacement (LLT) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Fuel Injector Components
    GM1977756Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Lubricate a NEW O-ring seal (1) with silicon free engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent.
  1. Install the following NEW components to the fuel injectors. Use steps 2 through 8 to install these components.
    • Upper O-ring Seal (1)
    • Plastic Spacer (2)
    • Retaining Ring (3)
    • Isolator Cup (5)
    • Teflon Seal (6)
    2. Fig 2: Identifying Injector Tip & EN 48266-1
    GM1829992Courtesy of GENERAL MOTORS CORP.
  2. From the EN-48266  , position the EN 48266-1 to the injector tip. See Special Tools .
    3. Fig 3: Removing/Installing EN 48266-1 Seal
    GM1829994Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: DO NOT lubricate the NEW seal.
  3. Install a NEW seal onto the EN 48266-1.
    4. Fig 4: EN 48266-1 Installed
    GM1829993Courtesy of GENERAL MOTORS CORP.
  4. Pull the NEW seal by hand over the EN 48266-1 and into the groove in the injector.
  5. Remove the EN 48266-1 from the injector tip.
    6. Fig 5: View Of Injector Tip & EN 48266-2
    GM1829997Courtesy of GENERAL MOTORS CORP.
  6. From the EN-48266  , install the EN 48266-2 to the injector tip. See Special Tools .
    7. Fig 6: EN 48266-2 Installed
    GM1829998Courtesy of GENERAL MOTORS CORP.
  7. Using the EN 48266-2, resize the seal. Install the EN 48266-2, until it bottoms out against the injector body, and rotate the EN 48266-2 while applying only moderate force 180 degrees in one direction and then 180 degrees back in the other direction.
  8. Remove the EN 48266-2.
    9. Fig 7: Removing/Installing Rebuilt Direct Fuel Injectors
    GM1977754Courtesy of GENERAL MOTORS CORP.
  9. Install the direct fuel injectors (1) to the cylinder head.
  10. Install the NEW direct fuel injector hold down clamps.
  11. Connect the fuel injector wiring harness electrical connectors to the fuel injectors.
    12. IMPORTANT: The fuel injectors have an alignment feature and must be reinstalled as noted during removal.
  12. Install the fuel injection fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement - Bank 1 (LLT)  or Fuel Injection Fuel Rail Assembly Replacement - Bank 2 (LLT) .
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