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 MANUALSMERCURY1999TRACER LS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURESFUEL SYSTEMINERTIA FUEL SHUTOFF (IFS) SWITCH
1999 Mercury Tracer LS, 4D Sedan, Standard
Inertia Fuel Shutoff (Ifs) Switch
1999 Mercury Tracer LS, 4D Sedan, StandardSECTION Inertia Fuel Shutoff (Ifs) Switch
WARNING:
DO NOT reset IFS switch until fuel system has been inspected for leaks and repaired if necessary.
- 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.
- To test IFS switch, turn ignition off. Remove IFS switch. Shake IFS switch to force it into tripped position (switch open). Check continuity between appropriate IFS switch terminals. See WIRING DIAGRAMS article. Continuity should not exist. Reset switch and ensure continuity exists between appropriate terminals.
INERTIA FUEL SHUTOFF (IFS) SWITCH LOCATION
| Application | Location | |
|---|---|---|
| Continental | Left Fender Apron Near Suspension Switch | |
| Contour, Cougar & Mystique | Behind Left Kick Panel | |
| Escort & Tracer | ||
| Coupe & Sedan | Right Side Of Trunk | |
| Wagon | Right Side Of Cargo Area | |
| Mustang | Lower Left Rear Of Trunk | |
| Sable & Taurus | Right Side Of Trunk Behind Wheel Well | |
| Town Car | Above Left Rear Wheel Well | |
| All Others | In Trunk On Left Hinge Support Or Behind Trim Panel | |
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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.