Idle Load Control (ILC)

Fig. 20 Idle Load Compensator (ILC) Assembly:

The Idle Load Compensator (ILC) is mounted on the carburetor and is used to control various low engine rpm conditions. The ILC uses a spring loaded vacuum sensitive diaphragm whose plunger extends when vacuum is not present. Vacuum to the ILC is controlled by the ECM through the ILC/RVB/EGR solenoid assembly. When the ECM turns "ON" the ILC solenoid assembly, vacuum is cut "OFF" to the ILC. Vacuum is regulated through the vacuum reduction valve (VRV) and delayed under high load conditions (checked) by the differential vacuum delay valve (DVDV) and through the Anti-Diesel Solenoid (ADS). The ADS is energized when the IGN is turned "ON" allowing vacuum to the ILC and turned "OFF" when the IGN is "OFF." This supplies vacuum to the ILC keeping the plunger retracted so the engine can shut down without dieseling.