The Dodge Colt Canister Purge Valve sends the excess fuel vapor into the engine where it burns instead of leaking into air, thereby trimming down hydrocarbon emissions. In this way, the Canister Purge Valve acts as a timed valve. When the engine is not running, it remains closed, and vapors are contained in the charcoal canister. When there is manifold vacuum under acceleration, it opens. The earlier models of Colt made in the early seventies applied a simple vacuum-operated Canister Purge Valve connected straight to carburetor suction. Later Dodge and Colt versions are the newer ECM-controlled solenoid style which uses the computer's control algorithm to close the vent, open the purge line, and allow a tank pressure sensor to confirm system integrity. The electronic Canister Purge Valve reacts more quickly and also supports onboard diagnostics and flips the check-engine lamp if vacuum fails to reach target, whereas the mechanical unit did not allow a self-test. Each modern Dodge layout still utilizes a tight fuel cap, a charcoal reservoir, and a responsive Canister Purge Valve in order to keep Colt emissions compliant.
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