Diagnostic Aids

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

An intermittent condition could be caused by an improperly installed or damaged EVAP canister purge valve or a temporary blockage in the EVAP canister purge valve. To repair a blockage in the EVAP system, see EVAP SYSTEM CLEANING under EMISSION SYSTEMS & SUB-SYSTEMS in REMOVAL & INSTALLATION - CORVETTE.