The Chrysler PT Cruiser Canister Purge Valve is designed to take up the fuel vapors and introduce them into the engine so that the hydrocarbons get burned instead of being vented off into the air. The Canister Purge Valve is located between the charcoal canister and the intake manifold. When the engine computer orders the valve to open, vacuum from the manifold draws in fresh air. This airflow picks up some stored vapors and sends the mixture into the combustion chambers. The early Chrysler PT Cruiser models utilized a Canister Purge Valve that was simple and effective. It was vacuum-controlled, which meant that it only opened when a pre-set manifold vacuum was present. In later PT Cruiser editions, a more sophisticated Canister Purge Valve was applied. This version was electronically actuated and was cycled on and off by the ECM. This electronic version has the added bonus of being able to allow onboard diagnostics to check the system for leaks. It does this by watching the fuel tank pressure sensor after the vent solenoid closes. If you want your Chrysler PT Cruiser to drive well and stay emission compliant, have its Canister Purge Valve checked regularly. Even if the generations were tweaked over the years, the overall goal never changed. Therefore, Chrysler kept the device focused on ensuring evaporative emissions do not foul up the smog, nor cause a glowing Check Engine Light when the gas cap is tight.
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