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Evap System Malfunction

avarenal

By avarenal
in Ask A GM Technician

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avarenal New Member

avarenal

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Posted

have a 2000 GMC Yukon that has check engine light. Was throwing code 420, gas cap, purge value, vacum pump, vacum leak. changed all (only 2 hoes for vacum) reset came back after about 200 miles. took to SMOG guy and he ran his computer on it and it comes back with evap system malfunction. He states not a vacum issue. any ideas on fixing this? need to smog it and cannot until I remove the check engine light.

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