![]() ![]() Once the valve has received the electrical signal, the valve will adjust to allow the required airflow into the combustion area. When the car is parked or stopped, the computer system will then send a signal to the IAC valve. The ECU also plays an important role in this process. The IAC works by bypassing the closed throttle plate, the valve allows air to circulate inside the car’s combustion area and allows the vehicle to idle smoothly. The throttle plate closes when a car is idling, and to ensure the vehicle continues to run smoothly when it is stopped, the IAC valve continues to inject air. The IAC works alongside a vehicle’s ECU to electrically manage the engine airflow when the car is idling. The idle air control valve is an engine component, often found attached to the throttle body. You can reset the idle air control (IAC) valve by turning the car on, putting the car into park, pressing the brake down, then pushing the gas pedal down, counting down about 5 seconds, turning the car off, waiting 10 seconds and start the car again, checking to see if the car is idling properly. In this article, we discuss how you can tell if there is a problem with the idle air control valve and share our guide on how you can easily reset the IAC. If this airflow is not controlled correctly, this can lead to stalling, poor acceleration, and the engine light illuminating. The valve is responsible for managing the airflow while the throttle is not being used when the engine is idle. However, issues with the IAC valve can lead to big problems with your engine. Often the IAC is attached to the engine throttle and its purpose is to regulate the airflow in the engine, helping to create smoother idling. Installation is in the reverse order of removal.The idle air control – or IAC – valve is an important component in a car’s engine. HINT: At the time of installation, please refer to the following items. Remove the 4 screws, IAC valve and gasket. Vehicle Powertrain Management Fuel Delivery and Air Induction Idle Speed/Throttle Actuator - Electronic Service and Repair Procedures Removal and Installation Take a look through them to make sure everything was done.ġ999 Lexus Truck RX 300 AWD V6-3.0L (1MZ-FE) Here are the directions specific to your vehicle for replacing the IAC. When you replaced it, was everything where it mounts clean and carbon free? Also, have you tried cleaning the throttle body? When you had the throttle body off to replace the IAC, are you certain it was resealed properly and there are no vacuum leaks? Car still drives well! Thanks for your reply and I will recheck.Īs mentioned, I worry when aftermarket parts are used for specific types of repairs. I will also give you a short video on start up. It appears valve is working fine but I will recheck that again. PCV was replaced when I did a tune up on vehicle.I did remove it and shook it. I will forward pictures regarding this and location. I do recall two vacuum hoses going into a small plastic box. There is also one more thing that I will check. That would indicate something was wrong with the valve. I did recheck a week ago for freedom of movement of IACV and it was flawless. I was going to remove electromagnetic Plug aka black piece, and see if it starts. I was going to try something I read on your site. The Rpms do not drop when releasing the throttle when in park or neutral. The car dives but it does not rev low like it use to. The IACV moved freely and no leaks once I used an original Lexus gasket. EBay had new ones for about thirty dollars. I removed the black piece and the magnet broke off IACV. I am not sure I did a great job and the hesitation started again on a relegation. I did use carburetor cleaner and it was better than new. I removed the hesitation on acceleration. I can hear the idle control valve open because of the high wine but settles down a little. I do not think the battery has nothing to do with the high idle. I tried the idle relearn procedure and reset the ECU. Car drives with no hesitation but I do noticed that I get that additional surge one stopping due to Increase in Rpm's. Rpm's drop but very slowly when I depress accelerator. I used a brand new gasket when placing throttle body back. I must also note that I leaned throttle body well when it was removed. I removed the electromagnetic motor which is the black piece. I used carburetor cleaner, propane, and water. I checked for vacuum leak at least 7 times. It Rpm's would eventually get down to 1100 but would have a tendency to go higher after car was driven. I started the vehicle and the Rpm's were very high at 2100 Rpm's. The price from from the original was very different. The part looked just like the one I removed. I replaced it with a brand new part from eBay. I replaced IACV valve on my vehicle listed above. ![]()
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