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

You are watching: How to adjust idle air control valve subaru

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.

Warning: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

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

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 that 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.

See more: Convert 350 Ml Equals How Many Ounces ? Convert 350 Ml To Fl Oz

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.