Quote:
Originally Posted by dmonk
No, I haven't tried removing the cap while idling. So if my AOS has failed, shouldn't I have a check engine light or something?
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Not necessarily. The optimum method to test the condition of the AOS is to use a digital manometer attached to an old oil fill cap. Warmed up, the system should read 5 inches of water or less; if it reads higher, or you read pressure, it is toast.