Car encyclopedia

Canister Purge Valve

The canister purge valve allows stored fuel vapors in the containment canister to be recycled back into the engine combustion process when necessary.

Symptoms of Wear or Failure

  • Check Engine Light may illuminate
  • Rougher than normal engine idle

Related Repair Advice

  • Evaporative system diagnosis can be difficult and trouble codes can be triggered by sensors and components other than the canister purge valve
  • It is not uncommon for bits of charcoal to separate from the charcoal brick inside the canister and cause the canister purge valve to stick in the open or closed position

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