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Strange 'Jet Engine' noise on first start up...

Discussion in 'A3/S3 Forum (8L Chassis)' started by spuddie007, Jan 2, 2008.

  1. spuddie007
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    spuddie007 Thomas the Tank Engine - Choo, Choo!

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    [Jan 2, 2008]
    Hey guys/gals

    Not sure if anyone has experienced a loud high pitched 'jet engine' sounding noise ocassionally on the S3 just after start-up?

    Any ideas what it may be be? It goes after a couple of minutes, as I'm selling the car very soon, wanna get it fixed before selling on.

    Any ideas gratefully received.....

    Spuddie :)
    #1
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  3. god_thats_quick
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    god_thats_quick Numptie of the highest order

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    [Jan 2, 2008]
    Might be the secondary air pump, but there's a number of things it could be so tiss rather hard to tell :detective2:
    #2
  4. golf
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    golf ***** rent boy VCDS Map User

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    [Jan 2, 2008]
    That'll be the Secondary Air Pump, it's just doing its job, it's nothing to be concerned about.
    #3
  5. spuddie007
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    spuddie007 Thomas the Tank Engine - Choo, Choo!

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    [Jan 2, 2008]
    Sweet.......it is only intermittant, some days it's audible, some it's not :)
    #4
  6. danclarke
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    danclarke 2001 Denim Blue S3 Rep

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    [Jan 2, 2008]
    mine makes the same noise always wondered what it was? it only stays on for about 15 seconds tho? what is the secondary pump for?
    #5
  7. spuddie007
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    spuddie007 Thomas the Tank Engine - Choo, Choo!

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    [Jan 2, 2008]
    Love the colour of your car mate!!
    #6
  8. SamDude
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    SamDude Active Member

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    [Jan 2, 2008]
    Is it the turbine? (ala KITT)
    #7
  9. HTC
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    HTC Active Member

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    [Jan 2, 2008]
    It pumps air into the exhaust system during cold starts to heat up the cat quickly and get it working on those emissions.
    #8

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