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Whistling sound at start up

Discussion in '4 Cylinder' started by brandon121, Apr 17, 2010.

  1. Apr 17, 2010 at 1:12 PM
    #1
    brandon121

    brandon121 [OP] Member

    Joined:
    Nov 20, 2009
    Member:
    #26247
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    First Name:
    Brandon
    New Roads, LA
    Vehicle:
    '13 PreRunner SR5 TSS Double Cab Barc. Red
    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????
     
  2. Apr 17, 2010 at 6:35 PM
    #2
    afd23a

    afd23a Well-Known Member

    Joined:
    Sep 26, 2008
    Member:
    #9483
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    The Dynamo of Dixie
    Vehicle:
    05 Access Cab 5 Lugger
    Factory Fog Lights, Removed Secondary Air Filter, Metra Ipod Adapter, Int Wiper Stalk, Wet Okole's, URD Short Shifter, Scanguage II w/Blendmount, Fat Bob's 2.75" spacer lift, ARE topper, SP Performance Pads & Slotted Rotors, 4.10 gears
    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.
     
  3. Apr 17, 2010 at 7:16 PM
    #3
    newengland

    newengland small /= slow

    Joined:
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    NH
    Vehicle:
    07 Reg. Cab. 2.7L s/c
    Alpine Supercharger, DT header, Gibson exhaust, URD short-shifter, Hellwig anti-sway bar, backwards helper-leaf traction mod
    Yup, air pump. By pumping air into the exhaust, it helps the cats warm up sooner.
     
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