What symptoms occur when a car's charcoal canister and solenoid valve fail?

[DelJude]

Here are the specific symptoms of a damaged charcoal canister solenoid valve: 1. Difficulty starting the engine, charcoal canister solenoid valve stuck open: Since the solenoid valve remains open continuously, the intake manifold becomes filled with fuel vapors. When starting the engine, the overly rich air-fuel mixture causes difficult engine starting or even stalling. 2. Fuel vapor leakage, charcoal canister solenoid valve stuck closed: When the solenoid valve remains closed continuously, the fuel vapors stored in the charcoal canister cannot be purged, leading to increased fuel tank pressure. This eventually causes fuel vapors to leak from the tank's pressure relief valve.