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2007 Chevy Colorado LS 2.9L Automatic trans RWD
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Back to P0446… another thought about the vent restriction test:

When you say the PCM runs the test and opens the purge and vent valve, where the tanks pressure sensor monitors the vacuum level and timing- does this involve the gas cap?

Should my gas cap be drawing in outside air, through the cap of course- not with the cap off nor with a sealed yet non vented or clogged up cap?
While the test is being performed?

Would the cap cause the test to detect too little or too much vacuum?
 
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