Infiniti Car 1998-05

Intake Manifold 2

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Removal & Installation



4.5L Engine
  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:

    Negative battery cable
     
    Engine appearance cover
     
    Air cleaner case and air duct
     
    Fuel tube quick connector
     
    Accelerator cable
     
    Wiring harnesses, bracket, vacuum hoses, vacuum gallery and PCV hose and tube from upper manifold
     
    Electric throttle control actuator
     
    Intake manifold adapter
     
    Water hoses
     

  8.  
  9. Loosen the upper intake manifold bolts in reverse of the tightening sequence and remove the upper manifold.
  10.  
  11. Remove the fuel rail and fuel injectors.
  12.  
  13. Loosen the lower intake manifold bolts in reverse of the tightening sequence and remove the lower manifold.
  14.  
  15. Remove and discard the gaskets.
  16.  

To install:



Click image to see an enlarged view

Fig. Lower intake manifold torque sequence-4.5L engine



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Fig. Upper intake manifold torque sequence-4.5L engine

  1. Clean the intake manifold mounting surfaces
  2.  
  3. Install or connect the following:

    Lower intake manifold using new gasket. Torque the bolts in sequence to 21 ft. lbs. (28 Nm).
     
    Fuel rail and injectors
     
    Upper intake manifold using new gasket. Torque the bolts in sequence to 106 inch lbs. (12 Nm).
     
    Water hoses
     
    Intake manifold adapter
     
    Electric throttle control actuator. Torque the bolts to 15 ft. lbs. (20 Nm).
     
    Wiring harnesses, bracket, vacuum hoses, vacuum gallery and PCV hose and tube from upper manifold
     
    Accelerator cable
     
    Fuel tube quick connector
     
    Air cleaner case and air duct
     
    Engine appearance cover
     
    Negative battery cable
     

  4.  
  5. Fill and bleed the cooling system.
  6.  
  7. Start the vehicle, check for leaks and repair if necessary.
  8.  


    Click image to see an enlarged view

    Fig. Exploded view of the intake manifold assembly-4.5L engine M45



    Click image to see an enlarged view

    Fig. Exploded view of the intake manifold assembly-4.5L engine Q45


 
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