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#1
09-05-2006, 12:42 PM
Hummer Guru
Join Date: Jul 2005
Location: Idaho
Posts: 4,744
Re: F5, 2007 H3 questions
Supercharges the catalyst...
It is only turned on during startup to add pressurized air to the exhaust manifold to help the catalyst reach operating temps faster, lowering emissions faster than if an air pump is not used. It is an electric pump so the engine does not have to turn a pulley.
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