Infiniti Car 1998-05

Fuel Injectors

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Removal & Installation



  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Relieve the fuel system pressure
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Intake manifold collector
     
    Vacuum hose from the fuel pressure regulator
     
    Fuel hoses from fuel rail
     
    Fuel rail bolts
     
    Injector harness connectors
     
    Injectors and the fuel rail as an assembly
     
    Injector(s) from the fuel rail by pushing them out
     

  6.  
  7. Remove and discard the fuel injector O-rings
  8.  

To install:

  1. Lubricate the new O-rings with clean engine oil and install the O-rings on the injector(s).
  2.  
  3. Install or connect the following:

    Fuel injectors to the fuel rail
     
    Fuel rail and injectors as an assembly to the intake manifold
     

  4.  
  5. Tighten the fuel rail bolts in the following sequence;
    1. Step 1: 7-8 ft. lbs. (9-10 Nm).
    2.  
    3. Step 2: 15-20 ft. lbs. (21-26 Nm).

      Fuel hoses to the fuel rail
       
      Vacuum hose to the fuel pressure regulator
       
      Intake manifold collector
       
      Negative battery cable
       

    4.  

  6.  
  7. Start the vehicle, check for leaks and repair if necessary.
  8.  

4.5L Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Engine appearance cover
     
    Fuel damper and hoses from fuel rail
     
    Fuel rail bolts
     
    Injector harness connectors
     
    Injectors and the fuel rail as an assembly
     

  6.  


    Click image to see an enlarged view

    Fig. Fuel rail and fuel injector assembly-4.5L engine


To install:

  1. Lubricate the new O-rings with clean engine oil and install the O-rings on the injector(s). The Green O-ring goes on the bottom and the Black O-ring goes on the top of the injector.
  2.  
  3. Install or connect the following:

    Fuel injectors to the fuel rail
     
    Fuel rail and injectors as an assembly to the intake manifold
     

  4.  
  5. Tighten the fuel rail bolts in the following sequence;
    1. Step 1: 7 ft. lbs. (10 Nm).
    2.  
    3. Step 2: 17 ft. lbs. (23 Nm).
    4.  



    Fuel hoses to the fuel rail
     
    Fuel damper
     
    Engine appearance cover
     
    Negative battery cable
     

  6.  
  7. Start the vehicle, check for leaks and repair if necessary.
  8.  

Except 4.5L Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Engine cover, as necessary
     
    Intake manifold collector
     
    Vacuum hose from the fuel pressure regulator
     
    Fuel hoses from fuel rail
     
    Fuel rail bolts
     
    Injector harness connectors
     
    Injectors and the fuel rail as an assembly
     
    Injector(s) from the fuel rail by pushing them out
     

  6.  
  7. Remove and discard the fuel injector O-rings
  8.  

To install:

  1. Lubricate the new O-rings with clean engine oil and install the O-rings on the injector(s).
  2.  
  3. Install or connect the following:

    Fuel injectors to the fuel rail
     
    Fuel rail and injectors as an assembly to the intake manifold
     

  4.  
  5. Tighten the fuel rail bolts in the following sequence;
    1. Step 1: 7-8 ft. lbs. (9-10 Nm).
    2.  
    3. Step 2: 15-20 ft. lbs. (21-26 Nm).
    4.  



    Fuel hoses to the fuel rail
     
    Vacuum hose to the fuel pressure regulator
     
    Intake manifold collector
     
    Engine cover, as necessary
     
    Negative battery cable
     

  6.  
  7. Start the vehicle, check for leaks and repair if necessary.
  8.  

 
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