Maxima 2007

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. Release the fuel system pressure.
  6.  
  7. Disconnect the negative battery cable.
  8.  
  9. On 350Z, remove or disconnect the following:

    Strut tower bar
     
    Engine cover
     
    Air cleaner case and duct
     
    Electronic throttle control actuator bolt in the sequence shown
     
    Fuel injector and fuel tube assembly
     
    Vacuum and water hoses from intake manifold collector
     
    EVAP solenoid valve bracket
     
    Upper intake manifold collector bolts in reverse of the tightening sequence

    Click image to see an enlarged view

    Fig. Upper intake manifold collector loosening sequence-Maxima 3.5L engine



    Click image to see an enlarged view

    Fig. Upper intake manifold collector tightening sequence-350Z 3.5L engine

     
    PCV hose
     
    Lower intake manifold collector bolts in reverse of the tightening sequence

    Click image to see an enlarged view

    Fig. Lower intake manifold collector tightening sequence-350Z 3.5L engine

     

  10.  
  11. On Maxima, remove or disconnect the following:

    Throttle body coolant hoses
     
    Electrical connectors from the Throttle Actuator
     
    Canister purge hose and blow-by hose
     
    Intake manifold collector support brackets
     
    Right side electrical connectors from the ignition coils
     
    Electrical connector from the crank angle sensor and the power transistor, if necessary
     
    Intake manifold collector-to-intake manifold bolts/nuts and the intake manifold collector
     

  12.  
  13. Remove the fuel injector assembly by performing the following procedures:
    1. Detach the electrical connectors from the fuel injectors.
    2.  
    3. Disconnect the fuel lines from the fuel injector assembly.
    4.  
    5. Remove the fuel rail-to-cylinder head bolts.
    6.  
    7. Remove the fuel rail assembly from the engine.
    8.  

  14.  
  15. Remove or disconnect the following:

    Intake manifold bolts/nuts in the reverse of the installation sequence
     
    Intake manifold from the engine and discard the gaskets
     

  16.  
  17. Clean all gasket mounting surfaces.

    Click image to see an enlarged view

    Fig. Intake manifold bolt loosening sequence-3.5L engines

  18.  

To install:

  1. Using new gaskets, install the intake manifold to the engine.
  2.  
  3. If necessary, tighten the intake manifold stud bolts to 87-104 inch lbs. (10-12 Nm).
  4.  
  5. Torque the intake manifold bolts in sequence as follows:
    1. Step 1: 4-7 ft. lbs. (5-10 Nm).
    2.  
    3. Step 2: 20-23 ft. lbs. (26-31 Nm).
    4.  
    5. Step 3: Tighten again to 20-23 ft. lbs. (26-31 Nm).

      Click image to see an enlarged view

      Fig. Intake manifold torque sequence-3.5L engines

    6.  

  6.  
  7. On 350Z, install or connect the following:
    1. Install the lower intake manifold collector bolts and tighten to 10 ft. lbs. (14 Nm)

      Click image to see an enlarged view

      Fig. Lower intake manifold collector tightening sequence-350Z 3.5L engine

    2.  
    3. Install PCV hose.
    4.  
    5. Install upper intake manifold collector bolts and tighten to 10 ft. lbs. (14 Nm)

      Click image to see an enlarged view

      Fig. Upper intake manifold collector tightening sequence-350Z 3.5L engine

    6.  
    7. Install EVAP solenoid valve bracket.
    8.  
    9. Install vacuum and water hoses to intake manifold collector.
    10.  
    11. Install fuel injector and fuel tube assembly.
    12.  
    13. Install electronic throttle control actuator bolts in the sequence shown and tighten to 64-85 inch lbs. (7-10 Nm).

      Click image to see an enlarged view

      Fig. Electronic throttle actuator removal and installation sequence-350Z 3.5L engine

    14.  
    15. Install air cleaner case and duct.
    16.  
    17. Install engine cover.
    18.  
    19. Install strut tower bar and tighten to 24 ft. lbs. (32 Nm).
    20.  

  8.  
  9. On Maxima, install or connect the following, and perform the following procedures:
    1. Install the fuel rail assembly to the engine.
    2.  
    3. Install the fuel rail-to-cylinder head bolts and tighten the bolts to 15-20 ft. lbs. (21-26 Nm) in 2 progressive steps.
    4.  
    5. Connect the fuel lines to the fuel injector assembly.
    6.  
    7. Connect the electrical connectors to the fuel injectors.
    8.  
    9. Install the intake manifold collector. Torque the fasteners to 13-15 ft. lbs. (17.5-21.5 Nm).

      Click image to see an enlarged view

      Fig. Upper intake manifold collector tightening sequence-Maxima 3.5L engine

    10.  
    11. Install crank angle sensor and transmitter electrical connectors.
    12.  
    13. Connect right side ignition coil electrical connectors.
    14.  
    15. Install intake manifold collector support brackets.
    16.  
    17. Install canister purge and blow by hoses.
    18.  
    19. Install throttle body, EGR valve and intake manifold collector hoses.
    20.  
    21. Install IAC valve and fuel pressure regulator hoses.
    22.  
    23. Connect TP sensor electrical connector.
    24.  
    25. Connect throttle body coolant hose.
    26.  

  10.  
  11. On all models, connect the negative battery cable.
  12.  
  13. Fill the cooling system.
  14.  
  15. Start the vehicle, check for leaks and repair if necessary.
  16.  

 
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