Driveability problems are often some the the most an overwhelming problems come diagnose, yet an erratic idle or regular stalling ~ above the F-150 is regularly a faulty idle air regulate valve. A quick cleaning or replacement of the IAC valve can commonly solve this trouble at an cheap price.

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This article applies to the Ford F-150 (1997-2003).

The idle air regulate (IAC) valve is supplied in numerous electronic fuel-injected engines to maintain suitable engine idle. This electronically controlled valve works to differ the quantity of waiting entering the engine when the throttle body is closed to stabilize the idle. End time and also mileage, the is common for carbon buildup to collection in the IAC valve and also cause erratic operation. Similarly, the electronic devices that run the valve can go bad, hence causing the valve come stick opened or closed. Symptoms of a faulty or malfunctioning IAC valve incorporate hard starting, stormy or erratic idle, engine stalling, and engine stumbling throughout take-off. Fortunately, the IAC valve on most Ford F-150 models are conveniently accessed and can be cleaned or replaced totally in a issue of minutes. This short article will overview the removal, cleaning, and replacement of the idle air regulate valve ~ above 1997 to 2003 Ford F-150 models.


Materials NeededMetric wrench and also socket set1/4" or 3/8" drive ratchetCarburetor cleanerGasket scraper or razor bladeToothbrush or similar

Step 1 – eliminate throttle body cover

Whenever functioning on your vehicle or truck, particularly with electrical components, the is commonly a good idea to disconnect the battery.

Disconnect the battery cable indigenous the negative (black) battery terminal. Course the cable away from the terminal to protect against accidental contact while working.Remove the accelerator body cover, i m sorry is typically held in ar by three small bolts, if her truck has one.
Figure 1. Disconnect an adverse battery cable.
Figure 2. Eliminate throttle human body cover for IAC valve access.

Step 2 – remove IAC valve

Locate the IAC valve fastened on or close to the accelerator body.Disconnect the electrical plug from the IAC valve. (On the 5.4L Triton engines, it is much easier to eliminate the valve itself prior to disconnecting the electric plug.)Remove the (2) 8mm bolts securing the IAC valve in place. Be sure to collect the washers and also gasket during removal.
Figure 3. IAC valve ar on 5.4L engine.
Figure 4. IAC valve place on 4.6L engine.
Figure 5. 4.6 liter motor IAC valve electrical harness plug.
Figure 6. Bolts securing IAC valve to accelerator body.

Step 3 – Clean IAC valve

In part cases, the IAC valve have the right to be cleaned v carburetor cleaner to remove carbon buildup and also restore functionality. Through the valve gotten rid of from the engine, soak the inside or the valve through carb cleaner till it is cost-free of gunk and buildup. A tiny toothbrush or comparable tool have the right to be supplied to scrub away any kind of stubborn grit. Allow the valve to dry prior to reinstalling.

Figure 7. Spray carburetor cleaner into the IAC valve come rinse away any kind of buildup.
Figure 8. Dirty valve (left) vs clean valve (right).

Step 4 – Reinstall IAC valve

Whether installation the old valve or swapping in a new unit, clean the throttle body mating surface ar of all old gasket material.Position the valve in location with a brand-new gasket and install the 8mm bolts and washers. Speak the bolts to about 7.5 ft/lbs.Reconnect the electric harness come the IAC valve.Reconnect the an adverse battery cable and also install accelerator body sheathe (if applicable).

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Pro Tip

It is extremely recommended the the IAC valve gasket be replaced, as an old gasket the does not correctly seal will permit un-metered air right into the engine and influence the idle.