What are the symptoms of a damaged carbon canister solenoid valve in a Focus?

[CoreyMarie]

Here are the specific symptoms of a damaged carbon canister solenoid valve in a Focus: 1. Difficult engine starting (solenoid valve stuck open): Since the solenoid valve remains constantly open, the intake manifold will be filled with fuel vapors. During engine startup, an overly rich air-fuel mixture will cause starting difficulties or even stalling. 2. Fuel vapor leakage (solenoid valve stuck closed): When the solenoid valve remains constantly closed, the fuel vapors stored in the carbon canister cannot be purged. This leads to increased fuel tank pressure, eventually causing fuel vapors to escape through the tank cap's pressure relief valve.