2004 GMC Envoy RWDFACTORY OEM SERVICE PROCEDURE

Installation Procedure

    Fig 1: View Of Fuel Injector, Clip & O-Rings
    GM351185Courtesy of GENERAL MOTORS CORP.
  1. Lubricate the new lower injector O-ring seals (4) with clean engine oil.
  2. Install the new O-ring seals (4) on the spray tip end of each injector (3).
    3. Fig 2: Removing/Installing Fuel Rail
    GM730890Courtesy of GENERAL MOTORS CORP.
  3. Install the fuel rail assembly.
    4. NOTE: Refer to the Fastener Notice in Cautions and Notices.
  4. Install the fuel rail attaching bolts.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

    5. Fig 3: Fuel Feed And Fuel Return Pipes (Left Side Of Engine)
    GM730718Courtesy of GENERAL MOTORS CORP.
  5. Connect the fuel feed and return pipes (1, 2) to the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
  6. Connect the fuel injector electrical connectors.
    7. Fig 4: Disconnecting/Connecting Fuel Pressure Regulator Vacuum Line
    GM730808Courtesy of GENERAL MOTORS CORP.
  7. Connect the fuel pressure regulator vacuum line.
  8. Install the intake manifold. Refer to Intake Manifold Replacement in Engine Mechanical.
  9. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  10. Inspect for leaks.
    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.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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