S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

Strange noise when start up

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Old 07-29-2004, 04:49 PM
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Default Strange noise when start up

Every time I get my S4 to start when code, the engine starts to make a weird noise brrrrrraaa, a few minutes later, noise goes away....

What could it be?
Old 07-29-2004, 06:03 PM
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secondary air pump to heat up cats and lower emissions.
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