How do you test the idle air control valve on a Honda Civic?

With the engine off, unplug the IAC valve electrical connector. Then use a couple of jumper wires to send direct battery voltage to the valve connector. You should be able to hear the valve working. An alternative method is to check the valve windings’ resistance using an ohmmeter.

How do I calibrate my idle air control valve?

Turn the ignition ON and leave on for several seconds then turn the ignition OFF to allow the ECM to reset the IAC valve. You should be good to go. If you need to adjust your minimum air (idle speed), click here.

When to replace idle air control valve in Honda Civic?

You depend on your Honda Civic to get you from work to school to home as efficiently as possible. You simply don’t have time for decreased RPMs and engine backfiring, so when it’s time to replace your idle air control valve for Honda Civic, AutoZone has you covered.

What does the idle air control valve do?

The idle air control valve (IAC) allows air to flow to the engine while the car is idling or decelerating, such as when you encounter a stop light or leave the car running (in park, of course) while you rush in the house to grab that lunch you forgot. During acceleration, the throttle body controls the flow of air to the engine.

What’s the correct idle speed for an IAC valve?

As a simple test, you can try lightly pressing the accelerator when the RPMs start to drop. If it returns to a normal level, and then starts to dip too low again, that can be a sign of an IAC valve problem. The correct idle speed will vary from one engine to another but is usually between 600 and 1,000 RPMs.

Why is my idle speed control valve clogged?

You can check the IAC valve at home with a voltmeter, if you happen to have one on hand. The most common cause for idle speed control valve problems is simply the valve itself becoming clogged with dirt, rust, or oil build up.