What are the most obvious symptoms of a faulty canister purge valve?

1 Answers
DiMelanie
07/30/25 10:07am
Because the canister purge valve operates intermittently, when you disconnect the hose from the canister purge valve and wait for the valve to activate, you can block part of the valve with your hand. If you feel the valve continuously sucking air or not responding at all, this indicates the valve is faulty. A properly functioning canister purge valve should intermittently suck air. If it doesn't, you can conclude the valve is damaged and recommend replacement to improve the situation. Here's additional information: The main working principle of the canister purge valve: Activated charcoal adsorbs fuel vapors. When the car starts, the valve controls the opening of the activated charcoal canister, allowing the absorbed fuel vapors to be reintroduced into the intake manifold for combustion, achieving fuel savings and environmental protection. When the canister purge valve is damaged, it cannot open or close the canister. If the valve fails to open, fuel vapors cannot enter the cylinders for combustion. If it's damaged and stuck in a constantly open state, this leads to an overly rich air-fuel mixture and incomplete combustion, causing most of the unburned fuel to be expelled from the vehicle, resulting in fuel waste and increased fuel consumption.
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