Through the internal combustion process on every vehicle, like in your Toyota, lots of gasses and vapors are produced that can be very detrimental to your vehicle and can cause for corrosion particularly to your vehicle's crankcase. To avoid corrosion, sludge formation and other damages on your vehicle's crankcase, these gasses and vapors must be removed. In drawing these gasses and vapors out of the engine crankcase back into the cylinder to be burned again, it is the Toyota PCV valve of your vehicle's PCV system that takes responsibility. Although there is a need to draw this gasses and vapors out of your vehicle's crankcase, still a small amount of it must be retained to comply with the required air/fuel ratio. Thus, the utility of PCV valve is needed. This PCV valve or the Toyota PCV valve to be specific is the one that controls the release of the crankcase gasses and vapors into the intake manifold. As the engine is at rest, the valve remains closed because of the spring action. And as the engine operates on its normal speed, the low vacuum that is being created allows the valve to be opened and releases the crankcase gasses and vapors towards the intake manifold to be burned. If as you slow down your vehicle's speed and the engine idle, the vacuum level rises and pulls the valve plunger into the valve opening. With this, the opening is partially blocked so that only small amount of gasses and vapors can be drawn from the intake manifold. Hence, with some unpredictable circumstance that happens, defect on your vehicle's PCV valve cannot be prevented. If this occurs, don't wait for such time until other parts of your vehicle's engine be affected. Acquiring Toyota PCV valve here on our site is the good remedy for a defective PCV valve.