Acura TL Canister Purge Valve regulates the flow of fuel vapors from the charcoal canister into the engine, reducing smog-forming hydrocarbons. Sitting between the charcoal canister and intake manifold, the Canister Purge Valve opens in response to the command of the Acura engine computer. This allows the vacuum in the intake manifold to draw in fresh air through the carbon pellets so that trapped gasoline fumes can mix with the normal air fuel charge and burn, rather than vent off to the sky. When the Canister Purge Valve is closed, the system is sealed so that the vapors remain trapped during parking or refueling. Early versions in the TL featured a simple vacuum actuated diaphragm. Later versions contained an electrically driven solenoid type Canister Purge Valve that can be cycled by the onboard diagnostics for self-tests. The newer solenoid type is faster to react. It also allows the ECM to measure system vacuum using a tank pressure sensor and helps to pinpoint leaks that otherwise would have set off the check engine lamp if a loose cap was ruled out. If the Canister Purge Valve is stuck, vapors will remain and a diagnostic code will display. However, when it is functioning properly, the entire EVAP circuit remains sealed and Acura keeps emissions well below federal limits on every TL.
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