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That's what I've heard anyway. I'm stealing this quote directly from the 94 owners manual:
"The pump begins to function when the engine is started and the car begins to move. It remains in operation until the three-way catalytic converter has reached normal operating temperature. A sound may be audible from the air pump during this warm-up period. This is normal."
I usually noticed it wind up after I'd start the car and go park by the mailbox in the morning to drop things off. Especially as it was dying, it sounded like it was being tortured =)
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