Park/Neutral Switch
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1985 Ford Ranger, 1985 Ford RV Cutaway, 1985 Ford Pickup, 1985 Ford Econoline, and 1985 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Automatic transmission 2.8L models use a park/neutral switch. Switch indicates whether engine is loaded or unloaded and ensures that vehicle cannot be started in gear. ECA uses signal generated by switch to maintain same idle speed regardless of engine load.