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Inspection Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the EVAP Pressure/Purge Diagnostic Station J 41413 in order to provide a clean, dry, low pressure gas source. Do not substitute any other pressurized gas source. Damage may result to the EVAP system.
IMPORTANT: DO NOT perform this procedure unless instructed by an 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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