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Home › Buick › 2005 › Park Avenue Base › Repair and Diagnosis › Engine Performance › System › Engine Control System - Introduction › Repair Instructions › Evaporative Emission (EVAP) System Cleaning › Cleaning Procedure

Cleaning Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .
  3. Turn OFF the main valve on the J 41413  . See Special Tools .
  4. Disconnect the hose from the diagnostic station pressure regulator.
  5. Using a section of vacuum hose, connect one end onto the diagnostic station pressure regulator.
  6. Connect the other end of the vacuum hose to the canister side of the purge pipe.
  7. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
  8. If the nitrogen does not dislodge the carbon particles, replace the purge pipe. Refer to Evaporative Emission (EVAP) System Cleaning .
  9. Return the EVAP pressure/purge diagnostic station to the original condition of the station.
  10. Install a new EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .
  11. Lower the vehicle.
  12. Install a new EVAP canister purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement (L36)  or Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement (L67) .
  13. Return to the published service procedure.
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