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Frustrated still f#@!kin misfires 2.4l

Discussion in '1st Gen. Tacomas (1995-2004)' started by boodacrf450, Sep 23, 2024.

  1. Sep 23, 2024 at 5:57 PM
    #1
    boodacrf450

    #1
    boodacrf450 [OP] Well-Known Member

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    Vehicle:
    99 Tacoma 2.4L
    frustrated still misfires 99 tacoma 2.4l 445000 miles replaced plug wires coils injectors checked vacuum lines did compression test. don't know what to do next gonna order new vacuum lines although the old ones look fine any suggestions?????
     
    boodacrf450, Sep 23, 2024
    #1
  2. Sep 25, 2024 at 6:54 PM
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    treyus30

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    treyus30 70% complete 70% of the time

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    Historic plates and 2 bar
    Jeez, where to begin. What codes do you have?
     
    treyus30, Sep 25, 2024
    #2
  3. Sep 25, 2024 at 7:12 PM
    #3
    boodacrf450

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    boodacrf450 [OP] Well-Known Member

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    p0301
     
    boodacrf450, Sep 25, 2024
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  4. Sep 25, 2024 at 7:29 PM
    #4
    treyus30

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    treyus30 70% complete 70% of the time

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    Historic plates and 2 bar
    That's all?

    Spark plug gap? Leaky injector?
     
    treyus30, Sep 25, 2024
    #4
  5. Sep 25, 2024 at 7:32 PM
    #5
    Bishop84

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    Bishop84 Well-Known Member

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    All thats left is ECU/Wiring (unlikely) or mechanical/valves/cams/pistons (more likely)

    Need to check the valves for carbon/burn marks, a borescope with a side camera would be ideal.

    Cheap one here, not sure how clear it would be
    $70 Dual-Lens Endoscope Camera with Light, DEPSTECH 1080P HD Borescope with 5"" IPS Screen, 16.5FT Flexible Sewer Camera, IP67 Waterproof Plumbing Snake Camera, Cool Gadgets for Men, Women, Black
    https://www.amazon.com/Dual-Lens-En...id=1727317953&sprefix=borescop,aps,177&sr=8-4

    You can also remove the intake manifold and peak at them while rotating the engine.
     
    Bishop84, Sep 25, 2024
    #5
  6. Sep 25, 2024 at 7:55 PM
    #6
    boodacrf450

    #6
    boodacrf450 [OP] Well-Known Member

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    Will do thanks gotta wait hurricane coming
     
    boodacrf450, Sep 25, 2024
    #6
  7. Sep 25, 2024 at 7:59 PM
    #7
    Glamisman

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    Glamisman Well-Known Member

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    What is the engine vacuum at idle?
    What is the MAF reporting as airflow in g/sec?
    What is the STFT @ idle, then 1000 rpm, then 2000 rpm?

    What does the freeze frame data show?
     
    Last edited: Sep 25, 2024
    Glamisman, Sep 25, 2024
    #7

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