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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 422 (Engine Controls - System & Component Testing - 3.8L) >> Emission Systems & Subsystems >> Evaporative Emission System Cleaning >> Cleaning Procedure

Cleaning Procedure

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, and 2003 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and support vehicle.
  2. Remove the EVAP canister.
  3. Turn OFF the main valve on the EVAP Pressure/Purge Diagnostic Station.
  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.
  9. Return the EVAP pressure/purge diagnostic station to the original condition of the station.
  10. Install a new EVAP canister.
  11. Lower the vehicle.
  12. Install a new EVAP canister purge valve.
  13. Return to diagnostic procedure that sent you here.
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