Nissan Pick-ups and Pathfinder 1970-1988

Fuel Injectors

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11

  1. Remove the throttle body assembly as outlined earlier.
  2.  
  3. Remove the rubber seal and the injector harness grommet from the top of the injection body.
  4.  
  5. Remove the injector cover.
  6.  
  7. Use a hollow bar with an inside diameter of not less than 5.5mm (0.217 in.) and with the throttle valve kept fully open, tap the bottom of the fuel injector with the hollow bar and plastic hammer.
  8.  
  9. Disconnect the harness of the injector from the harness connector.
    1. Remove the terminal retainer.
    2.  
    3. Using a small screwdriver, tilt the lock tongue, and at the same time push out the terminal.
    4.  

  10.  

To install:
  1. Put the harness of the new injector into a new injector harness grommet and the harness tube.
  2.  

Every time a harness grommet is removed it should be replaced with a new one. When assembling the connector, pay attention to the harness color and position, otherwise injector damage could occur.

  1. Replace all injector O-rings with new ones coated with some silicone oil and put the injector assembly into the injection body.
  2.  
  3. Push the injectors into the injector body by hand, until the O-rings are fully seated. Invert the injection body and insure that the injector tips are properly seated.
  4.  
  5. Apply some silicone bond to the injector harness grommet.
  6.  

Air tight sealing is essential to ensure stable and proper idling condition.

  1. Use locking sealer on the screw threads and reinstall the injector cover. Tighten the screws in a criss-cross pattern to ensure proper seating of the injector and cover.
  2.  
  3. Apply some silicone bond to the bottom of the rubber seal and attach the seal to the top face of the injection body.
  4.  

Do not reinstall the air cleaner until the silicone bond has hardened.

  1. Install the injection unit to the intake manifold and tighten the bolts EVENLY to 9-13 ft. lbs. 12-18 Nm).
  2.  



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Fig. Fig. 1: Tap the bottom of the fuel injector



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Fig. Fig. 2: Always use a hollow bar or equivalent



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Fig. Fig. 3: Exploded view of the fuel injection unit - Z24i engine



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Fig. Fig. 4: Exploded view of the fuel injection unit - VG30i engine



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Fig. Fig. 5: Disconnecting the harness connector



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Fig. Fig. 6: Disconnecting the harness connector



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Fig. Fig. 7: Injector assembly



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Fig. Fig. 8: Always replace the O-rings



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Fig. Fig. 9: Press the injectors into the throttle body



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Fig. Fig. 10: Apply silicone to the harness grommet



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Fig. Fig. 11: Tighten the injector cover screws in a criss-cross pattern

ADJUSTMENTS
Fast Idle Speed

See Figure 12

  1. Start the engine and run it until it reaches normal operating temperature.
  2.  
  3. Make sure that the aligning mark stamped on the fast idle cam meets the center of the roller installed on the cam follow lever. If not, correct the location of the fast idle cam by turning the adjusting screw (S1).
  4.  

If it is not adjustable, replace the thermo element.

  1. Measure the clearance G between the roller and the fast idle cam. The clearance should be 0.020-0.118 in. (0.508-2.99mm) for the VG30i engine and 0.028-0.118 in. (0.71-2.99mm) for the Z24i engine.
  2.  
  3. If not correct, adjust clearance G by turning the adjusting screw (S2). Make sure the engine is warmed up sufficiently and adjust to 0.031-0.047 in. (0.787-1.194mm) for the VG30i and 0.047-0.063 in. (1.194-1.600mm) for the Z24i.
  4.  



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Fig. Fig. 12: Fast idle adjustment

FICD Solenoid

See Figure 13

  1. With the engine at normal operating temperature, check the idle speed. (Refer to the Tune-Up Specification Chart).
  2.  
  3. Turn the air conditioner switch ON. When the A/C is on, the idle speed should be 850-950 rpm with the transmission in N.
  4.  
  5. If out of specification, adjust the idle speed by turning the adjusting screw.
  6.  



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Fig. Fig. 13: F.I.C.D. solenoid valve adjustment

Dashpot

See Figure 14

  1. Run the engine to normal operating temperature.
  2.  
  3. Turn the throttle valve by hand, and read the engine speed when the dashpot just touches the adjusting screw.
  4.  
  5. The dashpot touch speed is; 1300-1500 rpm for the VG30i and 1600-2000 rpm for the Z24i.
  6.  
  7. Adjust by turning the adjusting screw.
  8.  



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Fig. Fig. 14: Dashpot adjustment

 
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