Replace Subaru Impreza Vapor Canister Purge Solenoids. Shop Subaru Impreza Vapor Canister Purge Solenoid & Subaru Impreza Canister Purge Valve Solenoid. Maintaining the vapor canister purge solenoid in your Subaru Impreza is crucial for optimal performance and fuel efficiency. Regularly check for cracks or damage, ensuring connections are secure to extend its lifespan. When experiencing rough idling or difficulty starting, it may be time to replace this component. Choose a high-quality OEM-equivalent or better solenoid, as they are designed to meet precise vehicle specifications. The solenoid plays a pivotal role in controlling the flow of fuel vapors from the canister to the engine; thus, proper installation is key. Always opt for solenoids crafted from durable materials to withstand the rigors of under-hood conditions, and follow the manufacturer?s installation guidelines closely to guarantee a seamless fit and function.