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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1415 (Engine Control System - 4.2L (Introduction)) >> Repair Instructions >> Evaporative Emission (EVAP) System Cleaning >> EVAP Cleaning Procedure

EVAP Cleaning Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement (TrailBlazer EXT, Envoy XL, Envoy XUV)  or Evaporative Emission (EVAP) Canister Replacement (TrailBlazer, Envoy, Bravada, Rainier) .
  2. Turn OFF the main valve on the J 41413 .
  3. Disconnect the hose from the diagnostic station pressure regulator.
  4. Using a section of vacuum hose, connect one end to the diagnostic station pressure regulator.
  5. Connect the other end of the vacuum hose to the canister side of the purge pipe.
  6. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
  7. If the nitrogen does not dislodge the carbon particles, replace the purge pipe. Refer to Evaporative Emission (EVAP) Hoses/Pipes Replacement - Engine/Chassis .
  8. Return the J 41413 to its original condition.
  9. Install a new EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement (TrailBlazer EXT, Envoy XL, Envoy XUV)  or Evaporative Emission (EVAP) Canister Replacement (TrailBlazer, Envoy, Bravada, Rainier) .
  10. Install a new EVAP canister purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement .
  11. Lower the vehicle.
  12. Continue with the published service manual diagnostic trouble code (DTC) procedure.
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