2004 Pontiac Grand Prix GTPFACTORY OEM SERVICE PROCEDURE

Installation Procedure

CAUTION: In order to reduce the risk of fire and personal injury that may result from a fuel leak, always install the fuel injector O-rings in the proper position. If the upper and lower O-rings are different colors (black and brown), be sure to install the black O-ring in the upper position and the brown O-ring in the lower position on the fuel injector. The O-rings are the same size but are made of different materials.
  1. The O-rings must be replaced on all components that are serviced.
  2. Lightly oil the fuel injector O-rings with clean engine oil.
  3. Place the fuel rail (1) with the fuel injectors (3) on the intake manifold.
    4. Fig 1: Fuel Rail Assembly & Fuel Injectors (L32)
    GM910930Courtesy of GENERAL MOTORS CORP.
  4. Seat the fuel injectors (3) by HAND.
    5. NOTE: Refer to Fastener Notice in Cautions and Notices.
  5. Install the fuel rail hold-down nuts (2).

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

  6. Reposition and connect the spark plug wires to the ignition control module.
  7. Install the spark plug wires to the fuel rail retaining clips.
  8. Install the fuel injector electrical harness clips holding harness to the front and the rear of fuel rail.
    9. Fig 2: Fuel Injector Electrical Harness Clips
    GM198404Courtesy of GENERAL MOTORS CORP.
  9. Connect the fuel injector electrical connectors.
    10. Fig 3: View Of Fuel Injector Electrical Connectors
    GM198402Courtesy of GENERAL MOTORS CORP.
  10. Install the generator brace. Refer to Generator Brace Replacement (L26) or Generator Brace Replacement (L32) in Engine Electrical.
  11. Connect the fuel feed pipe to the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
  12. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  13. Inspect for leaks.
    1. Turn ON the ignition for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Turn ON the ignition.
    4. Inspect for fuel leaks.
  14. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (L26) or Fuel Injector Sight Shield Replacement (L32) in Engine Mechanical - 3.8L.
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.