Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 64 (ENGINE CONTROLS - BASIC TESTING - V8)FUEL SYSTEMINERTIA FUEL SHUTOFF (IFS) SWITCH
1991 Mercury Tracer Base, 4D Sedan, Automatic
Inertia Fuel Shutoff (Ifs) Switch
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION 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.
- 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 - 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.