What are the common faults of solenoid valves?

[VanTyler]

Solenoid valve faults include: 1. Abnormal noises during vehicle operation; 2. Engine hesitation when accelerating with noticeable fuel odor inside the cabin; 3. Fluctuating engine idle speed accompanied by weak acceleration; 4. Engine stalling or difficulty starting; 5. Inability to refuel the tank too quickly or overfill it. Simple testing method for charcoal canister solenoid valve: After removing the valve, blow into its intake port. If air leaks, it indicates damage, requiring multiple ignition attempts to start the vehicle. If no leakage occurs, the valve is intact, and other causes should be investigated. A vehicle's charcoal canister utilizes activated carbon's adsorption properties to collect fuel vapors, preventing waste. The charcoal canister solenoid valve opens during engine startup, releasing adsorbed fuel vapors into the intake manifold for combustion.