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Old 07-28-2012, 03:59 PM
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Many newer Fuel injected cars have an AIR pump. It runs for a minute or so when the engine is first started cold. Its purpose is to clean the unburnt hydrocarbons quickly, as when a cold engine is started the mixture is enriched. It also serves to heat the catalytic converter up very quickly, so it can function ASAP. Pretty smart.
Those are electric pumps, like a small leafblower,not belt driven.
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