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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 >> Inspection Procedure

Inspection Procedure

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NOTE: Use the EVAP Pressure/Purge Diagnostic Station (J 41413) to provide a clean, dry, low pressure gas source. DO NOT substitute any other pressurized gas source. Damage may result to the EVAP system.
  1. Turn ignition switch to OFF position.
  2. Remove the EVAP canister purge valve.
  3. Lightly tap the EVAP canister purge valve on a hard surface.
  4. Check for carbon particles exiting either of the vacuum ports.
    • If no carbon particles were detected, but a blockage was detected during a diagnostic procedure, install the original EVAP canister purge valve and continue with the cleaning procedure.
    • If carbon particles are found during the inspection procedure, replace the EVAP canister purge valve and continue with the cleaning procedure.
    • If a diagnostic procedure directed you to replace the EVAP canister purge valve and no carbon particles were detected, replace the EVAP canister purge valve and return to diagnostic procedure.
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