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Yoyo

Discussion in 'General Automotive' started by Dwg yota27, Feb 26, 2019.

  1. Feb 26, 2019 at 8:48 PM
    #1
    Dwg yota27

    Dwg yota27 [OP] Member

    Joined:
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    Donald
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    01 tacoma 2.7 4wd
    Hey guys my truck say system to lean I have changed maf I'm hearing bad cat or bad 02 sensor but it dont miss and idle funny constantly does it mainly when cool it warms up and does pretty good it just has got to where it will do it while warm but doesnt do it much if sensor was bad wouldn't it do it constantly
     
  2. Feb 27, 2019 at 9:33 AM
    #2
    KenLyns

    KenLyns 8.75" Third Member

    Joined:
    May 23, 2010
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    Belly of the Beast
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    4x4 TRD Off-Road Full-Auto
    LED Headlights, Volant CAI, 32" Duratracs
    ^Could be vacuum leak, from a cracked hose or bad intake manifold gasket. If visual inspection doesn't show anything obvious, you'll need to hook up a scan tool with live data showing ST and LT fuel trim, MAF reading, and O2 sensor readings at idle and with throttle, and go from there. Is the engine running in open-loop or closed-loop mode when the fault happens?

    Do you know how to make a smoke jar for checking vacuum leaks?
     
  3. Mar 9, 2019 at 8:36 PM
    #3
    Dwg yota27

    Dwg yota27 [OP] Member

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    01 tacoma 2.7 4wd
    I haven't found any hoses leaking how can I tell if its manifold gasket
     
  4. Mar 11, 2019 at 7:51 PM
    #4
    KenLyns

    KenLyns 8.75" Third Member

    Joined:
    May 23, 2010
    Member:
    #37674
    Messages:
    29,380
    Gender:
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    Belly of the Beast
    Vehicle:
    4x4 TRD Off-Road Full-Auto
    LED Headlights, Volant CAI, 32" Duratracs

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