Válvulas IAC

IAC valves

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In this article we talk about what the IAC valve of the cars is and how it works.

IAC Valves

tipos de vlavulas IAC

Definition

The IAC (Idle Air Control) a rough mode is a needle valve responsible for controlling the idle speed of the engine and is governed by the ECU (Electronic Control Unit or computer).


In vehicles without this valve, the only way to control the idle RPM was by adjusting the idling screw on the throttle valve itself. Usually this is inefficient for the issue of vehicle emissions control since the engine being idle or idle at all times does not have the same load and therefore if we make an incorrect adjustment we would be increasing the fuel consumption of the engine.


Electronically controlling the inlet air, allows the correct adjustment of air necessary to maintain the designated RPM, regardless of the environment and / or engine conditions. This also allows the ECU to respond dynamically to changes in engine load when the driver is not stepping on the accelerator, such as:


· Connection of the air conditioning compressor.
· Heating the vehicle when it is cold.
· When starting the vehicle. Many people do not know, but with a slow release of the clutch, the ECU will regulate the idle speed in such a way that the vehicle will start without problems.
· Turn the hydraulic steering.

Functioning

The IAC actuator is an electrically controlled needle valve, governed by the vehicle's ECU. The valve is mounted in such a way that it does not pass through the butterfly valve of the TBI.


The actuator consists of a solenoid or an electric motor depending on the brand of the injection system, which controls a plunger / valve that variably restricts the flow of air through the body of the device. Therefore, the ECU can control the amount of air that passes to the engine when the throttle valve is fully closed, thus controlling the engine idle RPM.


diagrama iac
In the previous figure there is a general diagram of what the idle control system is like.

Why does it fail?

The IAC valves of stepper motor are very precise and consume low power, but the great disadvantage is that the air flow passes through the stem and the spring creating turbulence, which causes all the dirt and the residual carbon of the combustion adhere to him; and with him
movement, all this dirt enters the moving mechanical part inside the valve motor, clogging it.

The dirt also increases if it gives unnecessary accelerations to the engine. This is because the rich mixture produces a lot of ollin, and the high vacuum that occurs in the intake manifold when you stop accelerating the engine sucks all this dirt into the valve.

Maintenance

Usually many people when the vehicle starts to fail at minimum or the engine gives jerks when you turn on the air conditioning or even when the scanner fails IAC completely replace the valve and often only by doing a maintenance of a few minutes solves the problem saving with this a lot of money.

In another article I will comment on how the maintenance is performed since it is a fairly extensive topic.

How an IAC works

Questions or doubts?

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Written by: Dennis García.

Mechanical Girl

Grade 
12/04/2016

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IAC valves

IAC valves

In this article we talk about what the IAC valve of the cars is and how it works.

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  • Asked by Manuel Garcia
    on 02/05/2017     El chery Orinoco tiene esa valvula? y me podria decir en donde? muchas gracias Answer:
    Buen día Manuel, este carro no usa válvula IAC porque posee acelerador electrónico. El mantenimiento al mismo de forma sencilla está en mi artículo de Falla de Aceleración del Orinoco. Las IAC las usan los carros más antiguos no carburados que son la mayoría aquí.
  • Asked by jorge vicente gallego rebollal
    on 09/24/2017     El Fiat Tempra modelo 95 lleva esa válvula, saludos Answer:
    Si usa IAC de 4 cables Jorge.
  • Asked by SERGIO TORREZ
    on 04/22/2018     hola denis tengo un problema con un nissan note motor hr15 lo revise todo y verifique que tiene chispa de encendido, y presion de combustible pero no le llegan los pulsos negativos a los inyectores y no arranca. su falla fue la siguente encendi el carro por la mañana para recorrerlo pero no lo calente mucho y luego lo apague y desde ahi ya no quiere encender vinieron mecanicos con escaner y no detectaron nada hasta quisieron desmontar el motor disiendo que le falta compresion asi que viendo tus videos pude llegar a que no le llegan pulsos a los inyectores,asi que energize los inyectores directamente para que ingresara combustible trato de encender pero como no le llegan pulsos se apago. mi pregunta es ¿que sensor le envia los pulsos a los inyectores? Answer:
    Que tal Sergio, los pulsos los envia la computadora a los inyectores y bobina en base a la medición de dos sensores CKP y CMP(si esta colocado) Por lo general el CKP es el amo y señor que gobierna y el CMP es solo un chismoso. En fin, ¿hay positivo en todos los inyectores? como tienes chispa el problema que tienes no es de sensor, para mi es del antirobo, ¿esa tiene llave codificada? muchas veces la llave deja de trabajar o la antena se daña. Una vez con solo cambiar de llave, un carro que llevaba dias accidentado encendió. Esa falla tenia locos a los mecanicos y al dueño del carro. jajajaja.
  • Asked by Sixto Ortega
    on 07/12/2018     Como realizar el mantenimiento de la válvula IACE de un Renault Sandero Answer:
    Que tal Sixto, igual como lo hago en el video.
  • Asked by Hugo
    on 08/09/2018     Hola tengo un Mégane 98 , motor 2.0 8 válvulas con GNC y puse la válvula Iac nueva porque no tenía (tenía una aparato con un tornillo para regular a mano el paso de aire), el problema que tengo es que al girar la dirección al tope bajan mucho las rpm y si no acelero se para el motor la válvula funciona ya corrobore eso , muchas gracias Answer:
    Lo mas seguro Hugo es que la IAC no esté calibrada. Por lo general cuando la compras ella viene un poco más retraida de lo normal. Esto es porque al montarla el carro quedará acelerado y la computadora calibrará el minimo. Si esto no lo hizo cuando la montaste, la IAC quedo descalibrada y entonces no llega a la RPM objetivo. O puede haber un problemita de "entonacion" de la máquina.
  • Asked by MANUEL MANUITT
    on 09/24/2018     BUEN DIA AMIGO COMO LE PUEDO REALIZAR MANTENIMIENTO AL IAC DE UNA CHEYENNE QUE POSEE UN MOTOR 350 TBI? Answer:
    Caramba debe ser viejita...jejeje. No recuerdo bien, pero esas no son como tal una IAC,sino mas bien un bypass. Se limpian como cualquier valvula, solvente en la parte sucia con hollin y que el mismo no pase a gomas ni a la parte electrica.

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