Maybe you are standing in front of your car with the hood up, scratching your head and wondering why your car is fluctuating in speed without even moving. We can attribute this to the idle air control valve (IAC) and the need to replace it, but we don’t always have to go to the mechanic.
What Is an Idle Air Control Valve and How Does It Work?
The IAC is a small valve that ensures the engine receives the right amount of air and associated RPMs during idling. Located on the throttle body next to the intake manifold, the IAC takes information from the car computer, ensuring the RPMs change in sync with the engine’s requirements. However, when it goes bad this is no longer the case.
What Happens When The Idle Air Control Valve Goes Bad?
When we have our car idling we usually hear a consistent speed from the engine. When this consistency starts to turn into more of a polyrhythmic drum solo from the engine, we need to take a look under the hood. If your valve goes bad, you will notice massive fluctuations on the dashboard tachometer and vibrations through the car. Eventually, the car will become underivable if the IAC is left unattended, so look out for the warning signs!