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Fuel Trim and 02 Signals

Discussion in 'Technical Chat' started by millwark, Dec 2, 2018.

  1. Dec 2, 2018 at 7:51 PM
    #1
    millwark

    millwark [OP] Member

    Joined:
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    96 Tacoma 2wd
    1st gen Tacoma here with 2.4. Bought the Bluedriver off Amazon to help with diagnosing.

    Had a misfire code on #2 cylinder. Checked out basic stuff but ended up just replacing the injectors. Solved the misfire but was having an issue with bogging on takeoff....no code. Replaced original maf...solved that.

    No additional codes but looked like a lazy upstream 02 sensor based on data in Bluedriver. Replaced that. But actually have less power now...no codes still, which is good. Runs smooth. Since installing 02 sensor, I haven't put many miles on it, nor did I reset the ecu by disconnecting ground.

    Here's a pic from inside the app for more info. Just wondering what some of you more knowledgeable folks think about this.

    Thanks.

    20181202_194726.jpg
     
  2. Dec 3, 2018 at 10:50 AM
    #2
    millwark

    millwark [OP] Member

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    Nothing?
     
  3. Dec 3, 2018 at 3:49 PM
    #3
    elnip

    elnip Well-Known Member

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    '98 Tacoma TRD S/C'd / '16 T4R Trail w/JFR EL Y-pipe 4.56's
    SC'd, fuel mods, Supra TT MAF, TRD headers, WI, Tundra Brake upgrade
    You short term fuel trim percentage shows you are rich as it is subtracting fuel.
     
  4. Dec 3, 2018 at 3:51 PM
    #4
    millwark

    millwark [OP] Member

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    Thanks for chiming in. Any thoughts as to why? Could it be that the rear 02 sensor is the weak link now or does it indicate something with the cat...
     
  5. Dec 3, 2018 at 3:58 PM
    #5
    elnip

    elnip Well-Known Member

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    '98 Tacoma TRD S/C'd / '16 T4R Trail w/JFR EL Y-pipe 4.56's
    SC'd, fuel mods, Supra TT MAF, TRD headers, WI, Tundra Brake upgrade
    Leaky injector(s) or a hole in the pressure regulator diaphragm....how may miles?
     
  6. Dec 3, 2018 at 4:28 PM
    #6
    millwark

    millwark [OP] Member

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    New injectors and regulator. 364k.
     
  7. Dec 3, 2018 at 5:05 PM
    #7
    elnip

    elnip Well-Known Member

    Joined:
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    '98 Tacoma TRD S/C'd / '16 T4R Trail w/JFR EL Y-pipe 4.56's
    SC'd, fuel mods, Supra TT MAF, TRD headers, WI, Tundra Brake upgrade
    Alright, sounds good. have you checked the fuel pressure? Are you burning oil? Still have cats?
     
  8. Dec 7, 2018 at 8:40 PM
    #8
    Boomkanani

    Boomkanani Well-Known Member

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    Some stuffz
    What are the long trim numbers?
     

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