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What's an air pump and what does it do? 850 1997

posted by  someone claiming to be TB on  Wed Nov 29 02:19 CST 2000 [RELATED]

At my 30K service told the service tech that I had been hearing a whining noise on start-up which quits after about a minute (No, it's not my wife, her whining wouldn't stop after only a minute!). Diagnosed as a bad (shorted out) air pump, replaced under warranty. What does this thing do?

Thanks!







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    Re: What's an air pump and what does it do? 850 1997

    posted by  someone claiming to be bob on  Wed Nov 29 04:08 CST 2000 [RELATED]

    It is an electric pump that forces air into the exaust system for up to 2 minutes after a cold start. It's purpose is to continue the combustion process in the exaust system to heat the catalytic converter faster to reduce emissions.






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