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Home › Chevrolet › 2004 › Venture Base, Van Cargo Extended › Repair and Diagnosis › Engine Performance › System › Engine Control System - 3.4L (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 (Short Wheel Base)  or Evaporative Emission (EVAP) Canister Replacement (Long Wheel Base) .
  3. Turn OFF the main valve on the J 41413  .
  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) Hoses/Pipes Replacement - Chassis/Canister (Short Wheel Base)  or Evaporative Emission (EVAP) Hoses/Pipes Replacement - Chassis/Canister (Long Wheel Base) .
  9. Return the EVAP pressure/purge diagnostic station to the original condition.
  10. Install a new EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement (Short Wheel Base)  or Evaporative Emission (EVAP) Canister Replacement (Long Wheel Base) .
  11. Lower the vehicle.
  12. Install a new EVAP canister purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement .
  13. Return to the published service procedure.
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