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Home >> Pontiac >> 2003 >> Sunfire Standard >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Removal & Installation >> Emission Systems & Sub-Systems >> EVAP System Cleaning >> Cleaning Procedure

Cleaning Procedure

  1. Raise and support the vehicle.
  2. Remove the EVAP canister. See EVAP CANISTER .
  3. Turn OFF the main valve on the EVAP Pressure and Purge Station.
  4. Disconnect the hose from the diagnostic station pressure regulator.
  5. Using a section of vacuum hose, connect one end onto the EVAP pressure/purge 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 clear the blockage, replace the purge pipe.
  9. Return the EVAP pressure/purge diagnostic station to the stations original condition.
  10. Install a NEW EVAP canister. See EVAP CANISTER .
  11. Lower the vehicle.
  12. Install a new EVAP canister purge valve. See EVAP CANISTER PURGE VALVE  under RELAYS & SOLENOIDS.
  13. Return to the diagnostic table that sent you here.
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