What voltage should the TPS be set to per the Ford Racing idle setting procedure?

The TPS (Throttle Position Sensor) should be set anywhere from .96 to .98 volts, by loosening the mounting screws and lightly rotating the TPS. If the desired range cannot be reached, the mounting holes may be drilled slightly larger.

What do I do if the engine stalls when the IAC solenoid is disconnected?

Turn the throttle-stop screw in one full turn and restart. Repeat as necessary until the engine will idle with the IAC unplugged.

How do I reset the computer to factory defaults during this procedure?

Stop the engine and disconnect the negative battery cable for 15-20 minutes. Tapping the brakes or turning the headlights on and off a few times helps purge remaining electrical current, resetting the computer to factory defaults.

What should I check if the idle problem persists after the procedure?

Inspect for mass air meter problems and possible vacuum leaks.

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Ford Racing Idle Setting Procedure - IAC, TPS Voltage & Base Idle Adjustment

Ford Racing idle setting procedure: IAC disconnect, throttle-stop idle, TPS 0.96-0.98V, PCM reset

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Ford Racing idle-set procedure (must run in sequence): disconnect IAC and set idle by throttle stop, set TPS to 0.96-0.98 volts, then reset PCM by disconnecting battery 15-20 minutes.

AI caption March 2011 · Photo 32 of 256

This is a one-page Ford Racing technical bulletin titled "Idle Setting Procedure," describing a nine-step sequence (plus one sub-step) for setting engine idle on Ford fuel-injected engines. The document emphasizes that the steps must be performed in order. The procedure begins by bringing the engine to operating temperature, then disconnecting the IAC (Idle Air Control) solenoid, turning the throttle-stop screw as needed until the engine idles with the IAC unplugged. The base idle is then set with the throttle stop, followed by setting the TPS (Throttle Position Sensor) to between .96 and .98 volts by loosening its mounting screws and rotating it, drilling the mounting holes larger if necessary. Step 4a notes that TPS wires to probe are generally the BLACK and GREEN wires, or the GRAY/RED and GRAY/WHITE wires, depending on the vehicle. The computer is then reset to factory defaults by disconnecting the negative battery cable for 15-20 minutes (tapping the brakes or cycling headlights to purge residual current). The IAC and battery are then reconnected, and the engine restarted. If idle problems persist, the document advises checking for mass air meter problems and vacuum leaks. It is signed "JHD/Ford Racing" and gives no specific year, model, or engine applicability.

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Frequently asked questions

What voltage should the TPS be set to per the Ford Racing idle setting procedure?: The TPS (Throttle Position Sensor) should be set anywhere from .96 to .98 volts, by loosening the mounting screws and lightly rotating the TPS. If the desired range cannot be reached, the mounting holes may be drilled slightly larger.
Which TPS wires should be probed when setting the voltage?: Generally the BLACK and GREEN wires, or the GRAY/RED and GRAY/WHITE wires, depending on your vehicle.
What do I do if the engine stalls when the IAC solenoid is disconnected?: Turn the throttle-stop screw in one full turn and restart. Repeat as necessary until the engine will idle with the IAC unplugged.
How do I reset the computer to factory defaults during this procedure?: Stop the engine and disconnect the negative battery cable for 15-20 minutes. Tapping the brakes or turning the headlights on and off a few times helps purge remaining electrical current, resetting the computer to factory defaults.
What should I check if the idle problem persists after the procedure?: Inspect for mass air meter problems and possible vacuum leaks.