This procedure covers the replacement of the Idle Air Control Valve on the 2011-2014 Ford F-150 3.5L EcoBoost engine to resolve idle quality issues.

Warnings

Tools required

Parts

• Idle Air Control Valve × 1 — Use OEM Motorcraft part or equivalent
• IAC valve gasket × 1 — Use OEM specification
• Throttle body cleaner × 1 — Aerosol throttle body/intake cleaner

Preparation

1. Ensure engine is completely cool to the touch
2. Disconnect negative battery terminal and wait 2 minutes for system capacitors to discharge
3. Remove engine cover by pulling upward on integrated pull points
4. Locate the throttle body assembly on the driver's side of the engine between the intake and air filter housing

Procedure

1. 1

   Access the IAC valve
   Locate the Idle Air Control Valve on the throttle body assembly. It is typically mounted on the side or bottom of the throttle body with a 2 or 4-wire electrical connector. Remove any air intake ducting that obstructs access by loosening hose clamps and moving aside.
2. 2

   Disconnect electrical connector
   Press the release tab on the IAC valve electrical connector and carefully pull the connector straight off the valve. If the connector is stuck due to corrosion, gently wiggle while pulling. Do not pull on the wires themselves.
   ⚠Inspect connector terminals for corrosion or damage; clean with electrical contact cleaner if necessary
3. 3

   Remove IAC valve mounting screws
   Using an 8mm socket or appropriate tool, remove the two mounting screws securing the IAC valve to the throttle body. Keep these screws organized as they may be reused if in good condition.
   Torque spec

   IAC Valve Screws3 Nm (2 lb-ft)
4. 4

   Extract the IAC valve
   Carefully pull the IAC valve straight out from the throttle body bore. If the valve is stuck due to carbon buildup, gently twist while pulling. Avoid using excessive force that could damage the throttle body housing.
5. 5

   Remove old gasket and clean mating surface
   Remove the old IAC valve gasket from the throttle body and valve. Use a plastic scraper or pick to carefully clean the throttle body mating surface, ensuring no gasket material remains. Spray throttle body cleaner on a shop towel and wipe the IAC port and surrounding area clean.
   ⚠Do not use metal scrapers on aluminum throttle body surfaces as this can cause damage and leaks
6. 6

   Inspect throttle body bore
   With the IAC valve removed, inspect the throttle body bore for excessive carbon buildup. If present, spray throttle body cleaner into the bore and wipe clean with shop towels. Avoid getting cleaner on sensors or painted surfaces.
7. 7

   Install new gasket on IAC valve
   Position the new gasket onto the replacement IAC valve, ensuring it seats properly in the groove. Verify the gasket is correctly oriented and not twisted or damaged.
8. 8

   Install new IAC valve
   Insert the new IAC valve with gasket into the throttle body bore, aligning the mounting screw holes. Push the valve gently into position until it seats flush against the throttle body surface.
9. 9

   Install and torque mounting screws
   Thread both IAC valve mounting screws in by hand to prevent cross-threading. Once both screws are hand-tight, use a torque wrench to tighten them in a cross-pattern to specification. These screws are small and easily over-tightened.
   ⚠Use proper torque specification of 3.0 Nm (2.0 lb-ft) - over-tightening will strip threads or crack the throttle body
   Torque spec

   IAC Valve Screws3 Nm (2 lb-ft)
10. 10

    Reconnect electrical connector
    Push the electrical connector firmly onto the new IAC valve until you hear and feel a positive click, indicating the locking tab has engaged. Gently tug on the connector to verify it is secure.
11. 11

    Reinstall air intake components
    Reinstall any air intake ducting that was removed for access, ensuring all hose clamps are properly tightened and all connections are secure. Replace the engine cover by aligning it with the mounting grommets and pressing down until seated.
12. 12

    Reconnect battery and perform idle relearn
    Reconnect the negative battery terminal. Start the engine and allow it to idle for at least 3 minutes without touching the accelerator pedal to allow the PCM to relearn idle control parameters. The idle may be rough initially but should stabilize.

Reassembly

1. Ensure all electrical connections are fully seated and locked
2. Verify all intake ducting is properly secured with no air leaks
3. Confirm engine cover is properly seated on all mounting points

Verification

• Start the engine and verify smooth idle with no hunting or surging after warm-up
• Check for diagnostic trouble codes using an OBD-II scanner - there should be no IAC-related codes
• Verify idle speed is within normal range (typically 650-750 RPM when warm)
• Test that engine responds properly to electrical loads (AC, headlights) without stalling
• Inspect IAC valve area for any vacuum leaks or loose connections

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