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There is a pump located under the intake manifold right behind the rad fans. It only comes on a few seconds (maybe a minute)after a cold start. On start-up it makes a noise, then its fine. I believe its called a secondary air pump for emitions. It was replaced by a new one, but it still makes the noise when it first starts.

Has anyone else with a VR6 engine noticed this noise? I am trying to find out if it is suppost to make this noise or is it faulty?
 

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Secondary Air Injection, it's for emitions, it adds more air in order to heat the cat up quicker. I don't have a cat, so right now all it makes my car do is sound like an IRL car on cold start
 
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