Infinity_QX56_2004-2005

Intake Manifold

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Relieve the fuel system pressure.
  6.  
  7. Remove or disconnect the following:

    Engine cover
     
    Air intake assembly
     
    Fuel supply hose quick connector using special tool J-45488
     
    Wiring harnesses and brackets from manifold
     
    Vacuum hoses
     
    PCV hose and tube
     
    Electric throttle control actuator, loosening bolts diagonally
     
    Fuel injectors
     
    Fuel rail assembly
     
    Intake manifold, removing bolts in reverse order shown in figure

    Click image to see an enlarged view

    Fig. Intake manifold and related parts



    Click image to see an enlarged view

    Fig. Intake manifold torque sequence

     

  8.  

To install:

  1. Install the intake manifold with new gaskets. Tighten the bolts in order as shown.
  2.  
  3. Install or connect the following:

    Fuel rail assembly
     
    Fuel injectors
     
    Electronic throttle control actuator, tightening the bolts in several steps
     
    PCV hose
     
    Vacuum hoses
     
    Wiring harnesses
     

  4.  
  5. Connect the fuel supply hose as follows:
    1. Apply a thin layer of engine oil on the tube from tip end to spool end.
    2.  
    3. Insert tube into quick connector past the white identification mark
    4.  
    5. Insert tube into quick connector until top spool is completely inside the connector and 2nd level spool is exposed right below the connector.
    6.  
    7. Pull slightly on the quick connector to ensure it is fully engaged.
    8.  
    9. Install quick connector cap on quick connector joint.
    10.  

  6.  
  7. Install or connect the following:

    Air intake assembly
     
    Engine cover
     

  8.  
  9. Refill the cooling system.
  10.  
  11. Start engine and check for leaks.
  12.  

 
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