The Honda Accord Canister Purge Valve forms the gatekeeper of the EVAP system that directs trapped fuel vapors from the charcoal canister into the intake where they burn rather than escaping into the air. On every Honda Accord since federal emissions regulations tightened, the Canister Purge Valve opens when engine vacuum rises, pulling in fresh air via the carbon granules and sending the hydrocarbons collected to the cylinders where they burn, reducing smog and keeping the check engine lamp off. Early versions in carbureted Honda models had a simple vacuum-controlled Canister Purge Valve which applied only manifold suction, but the later OBD II Honda Accord generations had an electrically commanded solenoid type Canister Purge Valve which can be opened or closed during self-tests by the engine computer to check if the system holds vacuum. The newer style has a vent solenoid and pressure sensor that allow the module to sense when there is a leak caused by a loose fuel cap or damaged hose, which is a refinement that distinguishes modern Accord emission control from its predecessors, and when the Canister Purge Valve becomes stuck shut, the stored vapors overwhelm the canister, while the stuck open valve is an invitation to rough idle and higher emissions.
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