5.0L Engine Only

The additional engine speed required during cold idle is accomplished by a throttle stop cam positioner similar to that used on conventional carburetors. The cam is positioned by a bimetal spring and an electric positive temperature heating element.

The electrical source for the heating element is 7.3 volts from the alternator stator which provides voltage only when the engine is running. The heating element is designed to provide the necessary warm-up profile in accordance to the starting temperature (cold engine prior to crank) and the length of time after starting. Multiple positions on the cam profile allow for a decreasing cold engine speed to curb idle speed during warm-up.

A second feature of the cold engine speed control is automatic kickdown from high speed. This is accomplished by the ECA vacuum to the automatic kickdown motor which physically moves the high speed cam a predetermined time after the engine starts.