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.

CAUTION: DO NOT reset inertia switch until fuel system has been inspected for leaks.

INERTIA FUEL SHUTOFF (IFS) SWITCH LOCATION

Application		Location
Escort & Tracer
Sedan		Right Side Of Trunk
Wagon		Behind Access Door In Right Rear Cargo Area
Mustang		Lower Left Center Of Trunk
Probe		Right Side 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 inertia switch terminal. See INERTIA SWITCH RESISTANCE table. Replace switch if resistance is incorrect, or if switch cannot be tripped.

INERTIA SWITCH RESISTANCE

Switch Position

Ohms

Open ⁽¹⁾

10,000+

Closed ⁽²⁾

0-5

⁽¹⁾	Indicates switch is in the tripped position.

⁽²⁾	Indicates switch is in the set position.

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.

Safety Warning

Inertia Fuel Shutoff (Ifs) Switch

Use the Manual With the Right Hardware

When to See a Mechanic

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