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Inertia Fuel Shutoff (Ifs) Switch

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1994 Mercury Grand Marquis, 1994 Mercury Cougar, 1994 Lincoln Town Car, 1994 Lincoln Mark VIII, and 1994 Ford Thunderbird. However, it is still accessible from the selected car via links, so may be relevant.
  1. If IFS switch is tripped, engine cannot be restarted until switch is manually reset. To reset IFS switch, depress switch button. For IFS switch location, see INERTIA FUEL SHUTOFF (IFS) SWITCH LOCATION table.
    INERTIA FUEL SHUTOFF (IFS) SWITCH LOCATION

    Application Location
    Mark VIII Left Front Of Trunk
    Mustang Lower Left Rear Of Trunk
    All Others In Trunk On Left Hinge Support Or Behind Trim Panel
  2. To test inertia switch, turn ignition off. Remove inertia switch. Shake inertia switch to force switch into tripped position (switch open).Measure resistance between appropriate inertia switch terminals. See WIRING DIAGRAMS section. Continuity should be not present between terminals with switch tripped and present when reset.