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Interpret these results please

Discussion in '1st Gen. Tacomas (1995-2004)' started by herrindude, May 23, 2023.

  1. May 30, 2023 at 12:57 PM
    #21
    Murd3rd

    Murd3rd I believe I Toyota harder than most

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    Yep, I agree. But it's a 2.4, it only has one that reports for actual fuel trim response. The second one merely monitors catalytic efficiency, and has no bearing on AFR correction.
     
  2. May 30, 2023 at 12:57 PM
    #22
    treyus30

    treyus30 70% complete 70% of the time

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    Actually the Torque app (and some handhelds) are capable of outputting the narrowband O2 waveform, but I think the factory ECU is fairly good at catching bad sensors
     
  3. May 30, 2023 at 12:58 PM
    #23
    b_r_o

    b_r_o Gnar doggy

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    Given the way too high maf reading and the negative trims. Without seeing 02 readings I'm gonna guess they're pegged high af
     
  4. May 30, 2023 at 12:59 PM
    #24
    Murd3rd

    Murd3rd I believe I Toyota harder than most

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    You'd think, but I had one be just enough off to make it correct incorrectly for a very long time but didn't throw a code or ever report in anyway that it was bad. Only reason I knew something was up was due to my standalone AFR gauge.
     
  5. May 30, 2023 at 1:01 PM
    #25
    b_r_o

    b_r_o Gnar doggy

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    Any problem anywhere else like a stuck open injector or bad oxygen sensor can't make the maf sensor read double what's normal. Its at the front of the line for airflow
     
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  6. May 30, 2023 at 1:06 PM
    #26
    Murd3rd

    Murd3rd I believe I Toyota harder than most

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    Agreed, and all the more reason to start there.
    I'm sorry if I made it sound like I was disagreeing or arguing with the troubleshooting of the issue. I just wanted to point out that you can't assume an end result due to another issue, it needs to be verified in some way. You only have part of the picture with the data given.
     
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  7. May 30, 2023 at 1:08 PM
    #27
    b_r_o

    b_r_o Gnar doggy

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    "What do you mean you guys charge for diag? I already have the codes!"
     
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  8. May 30, 2023 at 1:09 PM
    #28
    Murd3rd

    Murd3rd I believe I Toyota harder than most

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  9. May 30, 2023 at 7:28 PM
    #29
    herrindude

    herrindude [OP] 1996 2.4 extra cab auto

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    So i will replace maf sensor next, which make sense that it is bad if it is reporting 2 times the air flow than it should. Are there any multimeter checks i can do before i replace, like what resistance the sensor should have and of course voltage at the plug.
     
  10. May 30, 2023 at 7:40 PM
    #30
    Murd3rd

    Murd3rd I believe I Toyota harder than most

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    Is everything on the engine stock? Intake tube? Air box?
     
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  11. May 30, 2023 at 7:54 PM
    #31
    herrindude

    herrindude [OP] 1996 2.4 extra cab auto

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    Completely stock air box and tube
     
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  12. May 30, 2023 at 7:55 PM
    #32
    herrindude

    herrindude [OP] 1996 2.4 extra cab auto

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    Here is pic

    D5397F5A-AA7F-4F42-BC9A-CD632490757F.jpg
     
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  13. May 31, 2023 at 9:35 AM
    #33
    Murd3rd

    Murd3rd I believe I Toyota harder than most

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    I don't think this is necessarily the issue, but you are missing a giant vacuum line that goes from the airbox to the charcoal canister on the driver's side fender well. If memory serves it snakes around and ran atop the radiator or just inside the engine bay against the radiator.

    Something akin to this:

    Screenshot_20230531-123631.jpg
     
  14. May 31, 2023 at 10:31 AM
    #34
    Dm93

    Dm93 Test Don't Guess

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    Have you checked the assembly (aluminum piece) that the MAF goes into for any debris or obstuctions?
    Air filter is installed correctly?
    It doesn't take much to skew a MAF sensor.

    I had an F150 come in with a poor running complaint, in this case it was lean and the MAF was under-reporting.
    All it was was a tiny spider no bigger than a pin head stuck in the sensor, it had got sucked in when someone changed the air filter.
    20230503_095854.jpg
     
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  15. May 31, 2023 at 12:25 PM
    #35
    garetcurry

    garetcurry Well-Known Member

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    In my most humblest of opinion: It's a failing front O2 (AFR) sensor. Second to that, MAF sensor. Third to that, a massive vacuum leak.
     
  16. May 31, 2023 at 5:50 PM
    #36
    herrindude

    herrindude [OP] 1996 2.4 extra cab auto

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    I have a maf on the way, the hose you drew in red does not apply on my truck. At the airbox it is plugged and the canister has all the hoses connected

    E84C09E0-2B1D-40CD-9C8B-B2F4443B094F.jpg
    2BCD97AD-CFD2-4FC1-8E01-BFD3FACA51CA.jpg
     
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  17. May 31, 2023 at 5:51 PM
    #37
    herrindude

    herrindude [OP] 1996 2.4 extra cab auto

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    The maf aluminum tube is clean, no debris all clear.
     
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  18. May 31, 2023 at 5:53 PM
    #38
    herrindude

    herrindude [OP] 1996 2.4 extra cab auto

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    If this does not fix it o2 sensors are next on the list.
     
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  19. May 31, 2023 at 6:04 PM
    #39
    Murd3rd

    Murd3rd I believe I Toyota harder than most

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    Ah, ok.
     
  20. May 31, 2023 at 6:09 PM
    #40
    Murd3rd

    Murd3rd I believe I Toyota harder than most

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    Try removing the front O2 sensor and seeing if the fuel trims change at all. It should force the truck into open loop all the time and run rich with predetermined fuel table values since it will try to maintain 12:1 no matter the throttle position. I'm not 100% if it will still try to trim fuel, but I'd imagine not since it uses O2 data to determine proper fuel trims. If you remove the O2 and it runs the exact same as with it installed then it would point at the O2.

    Don't just unplug the O2 and leave it installed, you'll destroy it if it happens to be good. You can remove it from the exhaust and just ziptie it up out of the way and plug the exhaust flange for the sensor.
     

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