What is Carbon Canister Valve and EVAP Failure Symptoms

Our cars have many valves. The evaporation canister valve is one of them. But what is the task of the canister valve? How it works and what symptoms it gives when it fails.

An ordinary gasoline from the station contains more than 150 chemicals. When inhaled, these chemicals cause health problems such as dizziness, headaches, or difficulty breathing. These chemical fumes can kill a person if inhaled for a long time.

When you buy gasoline in the fuel tank, some of the fuel in the tank evaporates. Because this steam is flammable and therefore re-burned, it is sent to the engine. In addition, it is not released into the atmosphere and the emission values of the vehicle are low. In other words, the steam canister valve is part of the “Evaporative Emission Control System (EVAP)”. A car’s Evaporative Emission Control System (EVAP) is normally located between the intake manifold and a canister that stores fuel vapor. When the fuel vapor pressure in the canister increases sufficiently, the valve opens and the flammable gas is sent to the engine.

Canister Valve Failure Symptoms

When your vehicle’s steam control valve (EVAP) fails, it gives a number of signs of failure. In addition, the valve becomes clogged due to dust and dirt over time and may become inoperable.

1-) Idle Fluctuation and Decrease

When there is a problem with EVAP, your vehicle’s engine will start at low idle. Sometimes the idle will fluctuate by increasing and falling one by one. This is called hard idling. Low idle causes your car’s engine to vibrate or even stop.

2-) Hard Work of the Car

If you’re having trouble starting your car, this could be a sign that there’s a faulty canister valve. It can cause a vacuum leak in your vehicle and make it difficult for your vehicle to operate.

3-) Increase in Fuel Consumption

Since the vapor of gasoline in the fuel tank is flammable, it is burned again in the engine and provides additional energy to your vehicle. However, if the canister valve fails, this steam cannot be sent to the engine. This causes your car to burn more than usual.

4-) Engine Malfunction Lamp On

Every part found in today’s modern automobiles is continuously controlled by a computer called an engine control unit (ECU). The canister valve is also continuously monitored by the ECU. If the valve fails, the engine malfunction light sign will light up in your vehicle to notify the driver.

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