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Gulping noise at start-up?

Discussion in 'Technical Chat' started by Dudley, Jul 22, 2010.

  1. Jul 22, 2010 at 11:11 AM
    #1
    Dudley

    Dudley [OP] Cranky Old Bastard

    Joined:
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    First Name:
    David
    Texas
    Vehicle:
    10 Access Cab
    I have a 2010 2.7L Access. In the mornings when it is a little cool out I crank the engine and it goes into fast idle. After a few seconds I hear this weird gulping noise (kinda like a big shutter closing) and the engine idles down some. What the heck is that?:goingcrazy: This is the first vehicle that I have ever owned that made that noise.
     
  2. Jul 22, 2010 at 11:20 AM
    #2
    jassco

    jassco Well-Known Member

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    Aug 3, 2009
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    Boston
    Vehicle:
    2008 4runner, UrbanRunner Silver
    Mine does it too and it seems to be something with emissions. Most responses to this are in the form of(another vehicle forum):

    "Yes, part of the noise is the air pump (which replaced the pre-cat in the uppipe in MY06 and up), and also the ECU is programmed to run the engine extra hot at start-up to minimize the time it takes to reach operating temps in cats, thereby reducing emissions."

    As always if concerned go to the dealer! I say save your time and just ignore it. Welcome to the world of "everything on my car is electronic."
     
  3. Jul 23, 2010 at 4:53 AM
    #3
    Dudley

    Dudley [OP] Cranky Old Bastard

    Joined:
    Jun 24, 2010
    Member:
    #39388
    Messages:
    16
    Gender:
    Male
    First Name:
    David
    Texas
    Vehicle:
    10 Access Cab
    Thanks. Guess the days of tinkering with these things is completely over. You have a problem, call a computer programmer. Figures it has something to do with emissions. Can't wait for the new E15 gasoline they are trying to cram down our throats. I understand that could cause serious problems. :mad:
     

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