How To Adjust Idle Air Control Valve In Very Easy And Simple Steps

An idle air control valve is a device which is often utilized in fuel-injected cars to control engine’s idling RPM. The idle air control valve on a car is responsible for compensating the changes in the needed air-fuel ratio of your engine by letting less or more air in the engine.

When your engine requires more air in raising the idle speed, the valve opens as well as passes more air. In case your engine requires minimal air, like in the warm engine functioning, the valve tends to close, and the less air is supplied directly to your engine

What You Will Need

1. New Idle Air Control Valve

New Valve

The new valve will be used to replace the old valve to improve its performance.

2. New Gasket

New Gasket

The new gasket will be used to tighten the new valve at the sides of your car’s throttle body.

3. Screwdriver


A screwdriver is a tool you must have since it will help in tightening and loosing up the bolts.

Easy Steps On How To
Adjust The Idle Control Valve

Step One

Remove the electrical connector from the valve by simply lifting your locking tab at the same time pull the connector out of the valve. Unbolt the 8mm bolts which are connected at the valve to your throttle body. Then try to pull the valve away from the side of the car’s throttle body.

Step Two

Bolt your new gasket as well as the new valve onto the side of the throttle body. Securely tighten your bolts.

Step Three

Carefully plug your electrical connector in the valve.

Step Four

Ignite your engine and then turn it off after the electrical connector is properly plugged in the valve.

Step Five

Remove your electrical connector from the valve. Ignite the engine again and adjust your idle speed screw at the throttle body by the use of the screwdriver. Adjust it until your engine idles at 675 rpm.

Step Six

Start the motor and change the idle speed screw till the engine idles at exactly 650 rpm. By doing this, the base idle speed is set to a position where your valve has full control.

Step Seven

Turn off the engine. You can now plug back the electrical connector to the idle control valve.

Step Eight

Start the engine again then verify the control of your idle speed by switching on your air conditioning as well as monitoring the change in the idle speed.


When doing this process, it is recommended you put on safety glasses as well as the work gloves to prevent injuries.

Symptoms Of A Failing Or Bad Idle Air Control Valve

Idle Air Control Valve

Common signs of a failing or bad idle air control valve include irregular high idle speed, breaking when idling and the Check Engine Light turns on. 

An idle control valve is an engine management device which is found on various forms of the road going cars. This device is designed to control as well as regulate the engine idle speed, decreasing and increasing it to keep up with the working conditions.

Most of the idle air control valves are in the form of motor or motorized valve which is located on somewhere on the car’s intake manifold. The motor or the valve is controlled by your engine control unit that adjusts the idle speed in response to factors such as electrical system load and the engine temperature.

When your idle air control valve fails to work, it can lead to negative problems with the car. In some cases, the car might not move. A bad failing idle air control valve generates a few signs which can alert you to any potential issues. The factors include: 

1. Irregular Idle Speed

Irregular Idle Speed

The irregular idle speed is associated with a faulty idle air control valve. This device is programmed to control and maintain your engine idle speed at a constant rate.

In case the valve fails it can force the idle speed to be thrown off. When this happens, unusually low or high idle speed occurs.

2. The Check Engine Light Comes On

Check Engine Light

Another common issue with a bad or faulty air control valve is the Check Engine Light tends to turn on.

In case the engine control unit detects a problem with your idle air control valve signal or circuit, it tends to set off your Check Engine Light to alert you that there is a problem. 

Your Check Engine Light can as well be turned off by various issues; hence, having a computer scan it for unwanted codes is recommended.

3. Engine Stalling

Break car

Engine stalling is another common as well as a serious sign of a problem with your idle air control valve.

In case your idle control valves get destroyed completely, it may leave your car with no source of air which can be used to maintain a correct idle. 

Hence, the engine stalling results due to the presence of a faulty idle air control valve. In some cases, when the idle control valve fails to work, it may lead to an engine that fails to idle at all cost as well as breaks immediately when ignited.


The idle air control valve at one point or the other may fail to work properly.

Hence, it is a very good idea to know how to adjust idle air control valve as well as the signs that should alert you that the idle air control valve is failing or about to stop working correctly. 

The above information gives you detailed steps on how you can easily adjust idle air control valve as well as the signs of a faulty idle air control valve.

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