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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1416 (Engine Control System - 4.8L, 5.3L, & 6.0L - Introduction) >> Repair Instructions >> Evaporative Emission (EVAP) System Cleaning >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to Clean, Dry, Low Pressure Gas Source Notice in Cautions and Notices.
IMPORTANT: Do not perform this procedure unless instructed by an evaporative emission (EVAP) diagnostic.
  1. Turn OFF the ignition.
  2. Remove the EVAP canister purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement .
  3. Lightly tap the EVAP canister purge valve on a clean hard surface.
  4. Inspect for carbon particles exiting either of the vacuum ports.
    • If no carbon particles are found, install the EVAP canister purge valve and continue with the EVAP cleaning procedure.
    • If carbon particles are found during the inspection procedure, continue with the EVAP cleaning procedure.
    • If you were instructed to replace the EVAP canister purge valve, and no carbon particles are found, return to the EVAP diagnostic procedure. Do not perform the EVAP cleaning procedure.
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