Toyota Pick-ups/Land Cruiser/4Runner 1970-1988

Cold Start Injector

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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 is tripped and then opens the cold start injector. As the engine coolant warms up, the switch will eventually close the injector.

REMOVAL & INSTALLATION



See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the cold start injector union bolt(s) on the delivery pipe.
  4.  

Before removing the union bolt, place a suitable container under it to catch any escaping fuel.

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

To install:
  1. Install the cold start injector into the intake chamber and tighten the mounting bolts.
  2.  
  3. Connect the wiring connector.
  4.  
  5. Connect the delivery pipe to the injector and then connect the battery cable.
  6.  

Always use a new gasket when reinstalling the injector.

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



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the cold start injector

TESTING



  1. Unplug the wiring connector and remove the cold start injector from the air intake chamber.
  2.  

Do not disconnect the fuel line.

  1. Using Special Tool 09843-30011, connect one end to the injector and the other to the battery.
  2.  
  3. Remove the rubber cap from the Fuel Pump Check terminal and short both terminals with a wire.
  4.  
  5. Hold the injector over a suitable container and then turn the ignition switch to the "ON" position. Do not start the engine.
  6.  
  7. Check that the fuel splash pattern is even and V-shaped.
  8.  
  9. Disconnect the test probes from the battery and check that the fuel does not leak from the injector tip any more than one drop per minute.
  10.  
  11. Remove the Special Tool and reinstall the cold start injector.
  12.  
  13. Check the resistance of the injector. It should be 2-4-.
  14.  
  15. If the cold start injector did not operate properly in any of these tests, it will require replacement.
  16.  

 
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