What are the symptoms of a constantly open canister purge valve?
2 Answers
The symptoms of a constantly open canister purge valve are: 1. Once the engine starts, the gasoline vapor adsorbed in the canister will enter the cylinder and participate in combustion; 2. Difficulty in starting the engine; 3. Incomplete combustion of gasoline, leading to carbon deposits. The functions of the canister purge valve are: 1. To reduce air pollution caused by fuel evaporation from the car; 2. To improve the fuel efficiency of the car. The working principle of the canister purge valve is: When the accelerator pedal is pressed, the vehicle's computer system adjusts the fuel injection amount and the air-fuel mixture ratio accordingly. When the computer detects the need for additional air, the electronic magnetic valve will open.
I once encountered the issue of a stuck-open purge valve, and the symptoms were quite obvious. Starting the car was particularly difficult, with several failed attempts—it felt like the engine couldn't draw in proper air. Idling was also unstable; the car would often shake and stall, especially annoying at red lights. Fuel consumption inexplicably increased—where I used to refuel once a month, now I needed an extra half tank, all due to wasted fuel vapors leaking into the intake system. The dashboard warning light usually comes on, alerting you to a leak. Occasionally, a strong gasoline smell could be detected inside the car, posing a safety hazard. I recommend using a diagnostic scanner to check the trouble codes and confirm if the valve is stuck open. If the circuit is fine, a replacement valve might be necessary. Regular maintenance, like cleaning the fuel system, can help prevent these issues.
