Re: Code P0455 and the Gas Cap
Simple to test, unplug the electrical connector on the purge valve then disconnect evap line from cannister at purge valve with engine running and check for vacume at purge valve connector. If vacume is present valve is stuck open as it is a normally closed valve.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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