Early Fuel Evaporation (EFE) System - Non Turbo Only

EFE System Components.:

SYSTEM DESCRIPTION

The EFE system heats the incoming air/fuel mixture to improve atomization during cold start and engine warm up. This helps to improve performance and reduce HC emissions during these periods. The system, which is ECM controlled, consists of a relay, a coolant temperature sensor, and the EFE heater. When the engine coolant is below a specific temperature, the ECM will ground the relay circuit, energizing the relay, which in turn supplies current to the EFE heater. When the coolant warms to near operating temperature (approx. 150-160 °F, 65-75°C), the ECM will open the relay circuit, turning the system off. The EFE heater is a ceramic ring beneath the carburetor primary bore and is an integral part of the carburetor insulator gasket. The heating element is a positive temperature coefficient (PTC) semiconductor, which increases resistance directly with increasing temperature, reducing current through the elment. This property makes the heater self regulating at a specific temperature. Once the engine reaches operating temp, the ECM turns the relay off, shutting off the system.