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Old 06-18-2009, 07:05 PM
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HUMTECH HUMTECH is offline
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Default Re: Eng. Fault code PO446 Evap. System need Help.

It sets due to a restriction in the evap system, could be a pinched hose, evap cannister, evap vent solenoid, fuel tank pressure sensor. In most cases i have found the vent valve is plugged or not working, it is located behind the cannister approx right below the driver side b pillar on the outside of the frame. If you disconnect the line that goes to the evap cannister from the vent valve and find lots of dust inside you will need to replace both the cannister and vent valve as well as clean any dust out of the line
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1998 Chev Z71
2007 Chev Trailblazer SS
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