Air Bypass Valves
The air bypass valve is a part of the air intake system. They are a secondary system for air to enter the engine when the first intake is blocked by water. Water may get into the air intake when the driver goes through a puddle or is driving in very wet conditions. The air bypass valve is in a more protected area and doesn’t get wet as easily. It is positioned in the engine bay between other parts of the intake system. It is basically a filtered spacer in the intake system. It is activated by higher speeds and more demand upon the fuel system. At moderate speeds, it is usually not activated. Some argue that an air bypass valve actually decreases the potential power of the engine, but since it is a part that allows more air into the system, it most likely increases the available power.