Fuel Injectors: Installation

2004 Oldsmobile Bravada RWDSECTION Installation
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Coat NEW fuel injector "O" rings with clean engine oil. See Figure. Install fuel injectors into fuel rail with electrical connector facing outward. Ensure injectors rotate smoothly and freely. If "O" rings are installed incorrectly, injectors will bind. Install fuel injector retaining clip(s).
  2. Install fuel rail into cylinder head. Tighten fuel rail retaining bolts to specification. See TORQUE SPECIFICATIONS . Reconnect fuel pressure regulator vacuum line. Reconnect fuel feed and return lines at fuel rail. See FUEL LINE DISCONNECT FITTINGS .
  3. Reconnect fuel injector harness in-line connector. Install intake manifold. See INTAKE MANIFOLD . To complete installation, reverse removal procedure.
  4. Turn ignition switch to ON position for 2 seconds. Turn ignition switch to OFF position for 10 seconds. Turn ignition switch to ON position. Check for fuel leaks. Repair as necessary.
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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.