ISUZU Amigo/Pick-ups/Rodeo/Trooper 1981-1996

Early Fuel Evaporation (EFE) System

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OPERATION



See Figure 1



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Fig. Fig. 1: Schematic of the EFE system

This component is found on some carbureted models.

The Early Fuel Evaporation (EFE) system consists of the EFE heater, electronic control module, coolant temperature sensor and the EFE relay.

The EFE heater is equipped with a ceramic ring which is located below the primary carburetor bore. The ring is an internal part of the carburetor gasket. The EFE heats the incoming air charge to improve atomization. This offers better cold start and driveaway performance.

The coolant temperature sensor is activated when the ignition switch is turned to the ON position and the engine is started. If the engine coolant temperature is below the specified value, the ECM will supply current from the battery to the coils in the EFE heater to heat the incoming fuel/air charge.

INSPECTION



Remove the EFE heater from under the carburetor. If any of the heating grids are cracked or if the heater plate is damaged, it must be replaced.

REMOVAL & INSTALLATION



  1. Disconnect the negative (-) battery cable.
  2.  
  3. Remove the air cleaner assembly.
  4.  
  5. Remove the carburetor as outlined in Fuel System .
  6.  
  7. Disconnect and remove the EFE heater and gaskets.
  8.  

To install:
  1. Install the heater with new gaskets.
  2.  
  3. Install the carburetor as outlined in Fuel System .
  4.  
  5. Install the air cleaner, connect the battery cable, start the engine and check operation.
  6.  

 
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