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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 408 (Engine Controls - System Testing & Engine Component Tests - 3.1L) >> Emission Systems & Sub-Systems >> Evaporative Emission System Cleaning >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: 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.
NOTE: Proceed with the following procedure ONLY if referenced by a EVAP diagnostic or repair procedure.
  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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