Toyota Pick-ups/Land Cruiser/4Runner 1989-1996

Cold Start Injector

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OPERATION



During cold engine starting, the cold start injector is used to supply additional fuel to the intake manifold to aid in initial start-up. The opening and closing of the injector is determined by the start injector time switch. When the engine coolant temperature falls below a certain point, the switch opens the cold start injector. As the engine coolant warms up, the switch will close the injector.

TESTING



See Figures 1 and 2

  1. Disconnect the cold start injector wiring.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: With the aid of an ohmmeter, check the resistance of the cold start injector

  1. Using an ohmmeter, check the resistance of the injector; the reading should be 2-4 ohms.
  2.  



Click image to see an enlarged view

Fig. Fig. 2: Cross-sectional view and wiring diagram of the cold start injector system

  1. If the reading does not come within specifications, replace the cold start injector.
  2.  
  3. Attach the cold start injector wiring.
  4.  

REMOVAL & INSTALLATION



See Figure 3

  1. Disconnect the negative battery cable.
  2.  
  3. Safely relieve the fuel pressure. Remove the cold start injector union bolt(s) on the delivery pipe. Before removing the union bolt, place a suitable container and shop towel under it to catch any escaping fuel.
  4.  



Click image to see an enlarged view

Fig. Fig. 3: Exploded view of the cold start injector-3VZ-E engine shown

  1. Disconnect the wiring at the injector.
  2.  
  3. Unscrew the mounting bolts and then remove the cold start injector from the air intake chamber.
  4.  

To install:
  1. Using a new gasket, install the cold start injector into the intake chamber. Tighten the mounting bolts to between 48-69 inch lbs. (5-8 Nm).
  2.  
  3. Connect the wiring to the injector.
  4.  
  5. Attach the delivery pipe to the injector.
  6.  
  7. Connect the negative battery cable.
  8.  

Always use a new gasket when reinstalling the injector.

  1. Start the engine and check for any leaks.
  2.  

 
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