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Originally Posted by gschotland
Saw another post recently about testing to determine whether the AOS is bad or going bad. With the car running remove the oil filler cap. If it's tough to remove, like there's pressure in the system keeping it on (you'll hear a swoosh or sucking sound when removing it),
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this is what my neighbors car did just this weekend - heavy smoke, and the cap took two hands to remove. I think I heard a whirrrrrrrrr sound coming from the AOS...but I'm not positive.
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