How To Reset Idle Air Control IAC Valve? Most Simple Ways

Learning how to reset idle air control IAC valve is important since this valve is a critical component of the engine system of a vehicle. It is in charge of regulating the engine’s idle speed by managing the quantity of air that enters the air intake manifold.

Reset Idle Air Control IAC Valve

A faulty IAC valve can generate a poor idle, which can lead to a variety of engine issues. This complete guide will lead you through the process of resetting your IAC valve to assist and resolve idle speed difficulties.

How Do You Reset Your Idle Air Control IAC Valve?

To reset your idle air control (IAC) valve, you have to check for a check engine light first and then turn the engine on, rev the engine, release the gas pedal, turn the engine off, restart the engine, and finally drive the vehicle.

1. Check for a Check Engine Light

Before resetting your bad idle air control (IAC) valve, make sure your vehicle isn’t exhibiting any warning lights or problems. The check engine light is one of the most prevalent symptoms of engine failure.

When the onboard diagnostics system (OBD-II) identifies a defect in one or more of the vehicle’s systems, this warning light, also known as the malfunction indication lamp (MIL), activates.

When you turn the key to the “On” position, the check engine light should glow briefly before turning off. If your vehicle’s check engine warning light stays on, flashes, or goes on while you’re driving, it means there’s an issue that has to be addressed.

Over time, your engine may sustain more serious damage if you ignore the check engine light. Therefore, it’s crucial to take care of any warning signals as soon as they appear. You can interpret the codes and identify the precise issue that set off the check engine light if you have an OBD-II scanner.

You can drive your car to a qualified technician or an auto parts store to have the codes scanned if you don’t have access to an OBD-II scanner. Prior to resetting the IAC valve if your car’s check engine light is on, it’s critical to identify and fix the underlying problem. If you don’t, the problems can come back even after the reset.

2. Turn the Engine On

The next step in resetting the faulty idle air control (IAC) valve is to start the engine after looking for any warning indicators. Simply place the key in the ignition and turn it to the “On” position to do this. It’s crucial to remember that the engine needs to be left in park mode for this stage.

Starting Engine of a Car

Starting the engine in neutral or driving might force the car to move suddenly, endangering your life or doing major damage to the car. It’s crucial to give the engine some time to warm up after starting it. In order to perform a proper IAC valve reset, the engine must be at its ideal operating temperature.

It’s crucial to pay attention to the engine during this phase for any odd noises or vibrations. If you hear any strange noises, such as knocking or ticking, your engine may have an issue that has to be fixed.

The best course of action in this situation is to turn off the engine and take your car to a qualified technician for evaluation and repair. It’s crucial to listen for odd noises in addition to keeping an eye on the engine’s idle speed. A problem with the IAC valve or another engine component may be indicated by an excessively high or low idle speed.

3. Rev the Engine

The next stage in resetting the idle air control (IAC) valve is revving the engine once it has been turned on and given time to warm up. The bad IAC valve can now calibrate and adapt to the new settings, which makes this step crucial.


Push the gas pedal all the way down to about 2000 RPMs to start the engine revving. Maintaining this pace for the entirety of this stage requires holding your foot down for around five seconds.

The engine might be harmed by excessive or prolonged engine revving, it is crucial to remember this. It is essential to strictly adhere to the suggested RPMs and time frame, and it’s crucial to keep an eye on the engine throughout this phase to listen for any odd noises or vibrations.

If you hear or feel any odd noises or vibrations, your engine may be having a problem that has to be fixed. The engine’s overall performance can be enhanced by revving the engine in order to assist and clear out any debris that may have accumulated in the throttle body.

4. Release the Gas Pedal

The next step after revving the engine is to gradually let off the gas pedal. This procedure is necessary to give the IAC valve an opportunity to calibrate and adapt to the new settings. The engine should resume its idle speed as soon as you let go of the gas pedal.

Releasing the Gas Pedal

Before moving on to the following step, let the engine idle for at least five seconds. The IAC valve is now calibrating itself to the new settings and adapting to them. It is critical to remember that abruptly releasing the gas pedal might result in the engine stalling or even produce damage.

It is essential to gradually remove the foot and let the engine return to idle speed as a result. It’s crucial to keep an eye on the engine throughout this phase to listen for any odd noises or vibrations. If you hear or feel any odd noises or vibrations, your engine may be having a problem that has to be resolved.

The throttle position sensor (TPS) can also be reset by depressing the gas pedal. The TPS is a crucial sensor that communicates data about the position of the throttle valve to the engine control module (ECM). When the gas pedal is let off, the TPS resets and resumes transmitting proper data to the ECM.

5. Turn the Engine Off

The idle air control valve must be reset once the engine has been shut off. Before continuing, the engine must be turned off so that the computer may reset itself and erase any data that was previously saved in its memory.

Wait 10 seconds after turning the engine off before starting it again. In addition to resetting the idle air control valve, this enables the engine to cool down. It is advised to check the throttle body for any evidence of dirt, debris, or carbon buildup during the required 10-second time.

The idle control valve may have problems such as failing or malfunctioning as a result of a dirty throttle body. It is advised to use a throttle body cleaner to properly clean the throttle body if it is not clean. Although turning off the engine can seem like a straightforward action, it is essential to the reset procedure.

It enables the idle air control valve to be readjusted by the engine’s computer from scratch. Before starting the engine again, wait 10 seconds to visually check the engine bay for any other potential problems.

6. Restart the Engine

It’s time to restart the engine after turning it off to see if the idle air control (IAC) valve has been correctly reset. Simply start the engine by turning the key in the ignition. Observe the engine’s idle closely as it fires up. Is it operating more smoothly than it did before? Is idle speed consistency improved?

Restarting the Engine

Are there any odd noises coming from the engine? All of these should be taken into account when evaluating the engine’s performance once the IAC valve has been reset. You’ve probably been successful in resetting the IAC valve if the engine appears to be idling normally.

7. Drive the Vehicle

You can drive the car after completing the preceding procedures to check if the idle air control valve has been correctly reset. It’s advised to travel at least a few miles at a speed above 40 mph when driving. This aids the idle control valve’s self-calibration process.

Test Drive on a Vehicle

The electronic system in the car will then change the idle speed to the right setting. It’s common to observe that the engine speed varies or that the car runs a little rough while it’s being calibrated.

The idle air control valve has likely been correctly reset if the car continues to operate smoothly after some driving. You could be required to repeat the preceding procedures if you continue to experience idle speed issues or the check engine light is still on.

Can the Methods for Resetting the Idle Air Control Valve be Applied to Resetting the BMW Valvetronic?

Resetting the BMW Valvetronic requires a different set of steps than resetting the idle air control valve. The BMW Valvetronic system controls the engine’s intake valve lift, while the idle air control valve regulates idle speed. To reset the BMW Valvetronic, follow specific BMW Valvetronic reset steps provided by the manufacturer.

What Is the Connection Between Resetting the Idle Air Control Valve and Having Better Control of a Honda Pilot?

Resetting the idle air control valve can significantly improve Honda Pilot control. By recalibrating this essential component, the engine’s air intake is better regulated, resulting in smoother idling and improved performance. This helps enhance overall control of the vehicle, allowing drivers to maneuver the Honda Pilot more effectively and confidently on the road.

Can Resetting the Idle Air Control Valve Fix the VSA Light Issue in a Honda Accord?

Resetting the idle air control valve can potentially resolve the VSA light issue in a Honda Accord. By using the keyword “turning off VSA light on Honda Accord,” drivers can find relevant information and guidance on how to reset the valve. This process can help to rectify any issues with the VSA light, improving the vehicle’s performance and ensuring a smoother driving experience.

Is Resetting the Throttle Position Sensor Related to Resetting the Idle Air Control (IAC) Valve?

Yes, resetting Honda throttle position sensor is related to resetting the idle air control (IAC) valve. Both are important components of the engine management system and ensuring they are properly calibrated can improve engine performance and fuel efficiency. Properly resetting these sensors can help maintain smooth idling and optimal throttle response.


Idle speed problems can be resolved by resetting the idle air control valve, which is necessary for the engine to operate properly.

Summing up the key concepts we’ve covered:

  • The engine’s idle speed can be affected by a malfunctioning idle air control valve, which can result in difficulties including stalling or rough idling.
  • It is crucial to use an OBD-II scanner to check for any warning lights or error codes connected to the IAC valve before performing any reset procedures.
  • Typically, the reset process is revving the engine, letting off the gas pedal, shutting off the engine, and starting it again.
  • In some circumstances, the idle air control valve can be automatically calibrated by merely driving the car for a short distance at speeds greater than 40 mph.
  • It could be required to replace the idle air control valve if the problem continues even after trying to reset it or driving the car.

In conclusion, our idle air control IAC valve post offers instructions for resetting your IAC valve and increasing your car’s idle speed. Before resetting the IAC valve, remember to identify and address any underlying problems that may be produced.

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