A4 (B6 Platform) Discussion Discussion forum for the B6 Audi A4 produced from 2002-2005

Cold start engine noise

 
Old 01-11-2019, 10:01 PM
  #1  
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Default Cold start engine noise

Every morning when I start my car. It makes a noise on the turbo side. Like its blowing air and also a brrup brrup brrup noise on the same side. After a few seconds the noises disappear. It only does it when first start in the morning or cold days.
Larry Wright is offline  
Old 01-14-2019, 06:11 AM
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Secondary Air Injection blower? That runs for around a minute to add air for the catalytic converter, to speed its warm-up.
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