GM Firebird 1982-1992 Repair Guide

Fuel Injectors

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REMOVAL & INSTALLATION



See Figures 1, 2 and 3

Use care in removing injectors to prevent damage to the electrical connector pins and the nozzle. The fuel injector is serviced as a complete assembly only. Since it is an electrical component, DO NOT immerse it in a cleaner.

2.8L and 3.1L Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Remove the intake plenum and the fuel rail assembly.
  6.  
  7. Rotate the injector retaining clip to the unlocked position and remove the injector. Discard the O-rings and the injector retaining clip.
  8.  

Different injectors are calibrated for different flow rates. When ordering new injectors, be sure to order the identical part number that is inscribed on the old injector.

To install:
  1. Lubricate the new O-ring seals with engine oil and install them on the injector. Assemble a new retaining clip on the injector.
  2.  
  3. Install the injector into the fuel rail socket with the electrical connections facing outward. Rotate the retaining clip to the lock position.
  4.  
  5. Install the fuel rail assembly.
  6.  
  7. Install the intake plenum with new gaskets.
  8.  
  9. Tighten the fuel filler cap and connect the negative battery cable.
  10.  
  11. With the engine OFF and the ignition ON, check for fuel leaks.
  12.  



Click image to see an enlarged view

Fig. Fig. 1: Sectional view of a fuel injector



Click image to see an enlarged view

Fig. Fig. 2: Fuel injector part number location

3.8L Turbo Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Remove the fuel rail assembly.
  6.  
  7. Disengage the injector retaining clip.
  8.  
  9. Remove the fuel injector. Discard the O-rings.
  10.  

Different injectors are calibrated for different flow rates. When ordering new injectors, be sure to order the identical part number that is inscribed on the old injector.

To install:
  1. Lubricate the new O-ring seals with clean engine oil and install them on the injector.
  2.  
  3. Install the fuel injector into the fuel rail socket.
  4.  
  5. Assemble the injector retaining clip.
  6.  
  7. Install the fuel rail assembly.
  8.  
  9. Tighten the fuel filler cap and connect the negative battery cable.
  10.  
  11. With the engine OFF, turn the ignition switch to the ON position. Check for fuel leaks.
  12.  



Click image to see an enlarged view

Fig. Fig. 3: Injector retaining clip

5.0L and 5.7L TPI Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Remove the intake plenum and runners.
  6.  
  7. Remove the fuel rail assembly.
  8.  
  9. Rotate the injector retaining clip to the unlocked position and remove the injector. Discard the O-rings and the injector retaining clip.
  10.  

There are two different injector part numbers for the 5.0L and the 5.7L engine. Do not intermix injectors with different part numbers, as this will result in engine roughness and excessive emissions. When ordering new injectors, be sure to order the identical part number that is inscribed on the old injector. However, if a complete set of injectors is being replaced, either part number for that engine application may be used.

To install:
  1. Lubricate the new O-ring seals with engine oil and install them on the injector. Assemble a new retaining clip on the injector.
  2.  
  3. Install the injector into the fuel rail socket with the electrical connections facing outward. Rotate the retaining clip to the lock position.
  4.  
  5. Install the fuel rail assembly.
  6.  
  7. Install the intake plenum and runners with new gaskets.
  8.  
  9. Tighten the fuel filler cap and connect the negative battery cable.
  10.  
  11. With the engine OFF and the ignition ON, check for fuel leaks.
  12.  

 
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