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My car made a pretty loud "wooooooo" sound - kind of like blowing over the lip of a coke bottle. I pulled the inner fender liner and removed those valves and somehow the car fixed itself. I have a guess that the sound might come back in the colder weather. It's funny how I never had a CEL for the evap system. You'd think if the valve didn't work at all the car couldn't test the fuel tank tightness. I also replaced the "vent valve", which is a part the clamps over the fill pipe under the fender. I neveer did figure out exactly why the noise disappeared.
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