Early Fuel Evaporation ( EFE ): Description and Operation

In this system, air/fuel mixture to be drawn into the engine combustion chamber is warmed up to improve the burning efficiency while engine warming up. Located between the throttle body and the intake manifold, EFE heater is turned ON and OFF by its relay which ECM controls. EFE heater is turned ON while engine warming up (when coolant temp. is low and engine speed is higher than specified idle speed) and it warms air/fuel mixture which passes through it and as a result, fuel is atomized better.