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Whistling sound at start up

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Old 04-17-2010, 02:12 PM   #1
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Whistling sound at start up

I have an 08 2.7 with the five speed manual and for about the first minute after start up on a cold start there is a high pitched whistling sound coming from under the hood. I looked to see what it was and it's coming from a little motor by the the air cleaner that has a line going to the exhaust manifold..what is this contraption????
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Old 04-17-2010, 07:35 PM   #2
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air injection pump. Sorry I don't know exactly how to explain it or why it's there, but I think it has something to do with lowering emissions.
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Old 04-17-2010, 08:16 PM   #3
small /= slow
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Yup, air pump. By pumping air into the exhaust, it helps the cats warm up sooner.
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