When to Change an Idle Air Control on a 2001 Windstar

Print this articleThe idle air control (IAC) valve on a modern car maintains the engine idle when the throttle is closed. Used by all manufacturers, the IAC valve was replaced when electronic throttle bodies and drive-by-wire systems began to proliferate in the mid to late 2000s. Over time, a IAC can degrade or become fouled with oxidation, thus requiring cleaning or replacement. If you own a Windstar, a minivan made by Ford from 1995 to 2003, you may need to change the IAC.

Related Searches: Location of the IAC

The IAC is attached to the throttle body. If you open the hood of your 2001 Ford Windstar, you will see the throttle body is located in the upper right corner of the engine bay, int front of the driver's position. The throttle body is connected to the intake manifold on its left and the air filter intake tube on its right. The IAC itself is a large metal housing with a two-prong electrical sensor connected to the throttle body with two small bolts. It sits right on top of the throttle body.

Symptoms of a Bad IAC

The main symptom of a bad IAC is extremely poor idling. The vehicle may stall after it is started unless you keep your foot on the throttle. Once warmed up, the engine may hold idle but will bog down or stumble when you come to a stop.

Repair

To remove the IAC for repair, disconnect the electrical sensor at the the end of the housing, and then remove the two retaining bolts. If you flip the IAC over, you will see that it is a plunger on a metal rod. You can use throttle body cleaner to soak the plunger assembly and clean the rod. Clean the electrical connection to the wiring harness as well, and use a dab of electrical-grade silicone to lubricate the connection terminals. This may restore the IAC's function, particularly if your Windstar has high mileage.

Replacement

You can purchase a replacement IAC from your local Ford dealer or an automotive supply parts store. Simply unclip the electrical connector and remove the two retaining bolts. Remove the old IAC and insert the new unit. It may take a few starts before the new IAC is fully calibrated.

References"Ford Windstar Haynes Repair Manual 1995-2001"; Haynes Publications, Inc.; 2001Read Next:

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