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3.4L Back fires and I need help

Discussion in '1st Gen. Tacomas (1995-2004)' started by AK1stGen, Oct 11, 2017.

  1. Oct 11, 2017 at 10:12 PM
    #1
    AK1stGen

    AK1stGen [OP] Active Member

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    I need some 3.4l experts advice/wisdom

    My 01 Taco 4x4 3.4 manual runs like sh*t. It idles fine, but backfires, misses and Boggs down above 2,000 rpms only underload(revs all the way up to 5k in nutreural fine)
    It backfires from the intake not the exhaust which points to the engine running lean
    So here's what I've done so far:
    -Checked for vacuum leaks (there are none that I can find)
    -replace fuel filter
    -replace intake gaskets
    -replace spark plugs/wires
    -replace all ignition coils
    - replace maf sensor, throttle position sensor, o2 sensor(upstream)
    -replaced fuel pump
    -replaced all fuel injectors
    - checked valve timing (all timmimg components were replaced 2,000 miles ago along with water pump and thermostat.
    -cleaned throttle body

    All of these items have done nothing! And I am completely stumped.

    --Also a side note, I recently replaced the engine with one out of a 99 4 runner, but it has ran really good up until last weekend.
     
  2. Oct 11, 2017 at 10:38 PM
    #2
    Dalandser

    Dalandser Million bucks short of being a millionaire

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  3. Oct 12, 2017 at 12:50 AM
    #3
    AK1stGen

    AK1stGen [OP] Active Member

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    Yes, fuel pressure is good
     
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  4. Oct 12, 2017 at 2:04 AM
    #4
    mechanicjon

    mechanicjon They call me "Jonny 9 Fingers"

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    Plugged cat maybe? Try lessening the exhaust pipe from manifold. enough to allow about 1/4 inch gap. Then test drive.
     
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  5. Oct 12, 2017 at 2:05 AM
    #5
    mechanicjon

    mechanicjon They call me "Jonny 9 Fingers"

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    When did this start running bad? was it gradual or all of a sudden?
     
  6. Oct 12, 2017 at 5:35 AM
    #6
    tony2018

    tony2018 Well-Known Member

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    I've heard that using the wrong spark plug could have issues.
     
  7. Oct 12, 2017 at 9:56 AM
    #7
    MalinoisDad

    MalinoisDad Active Member

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    +1 for correct plug usage. 5VZ-FE requires dual grounded plugs.
     
  8. Oct 12, 2017 at 10:59 AM
    #8
    AK1stGen

    AK1stGen [OP] Active Member

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    I'm using dual grounded denso plugs

    Both cats are completely gutted because they were clogged about 15,000 miles ago and I didn't have time or money to replace them at the time.

    The problem started last weekend and got worse as I drove it.
     
  9. Oct 12, 2017 at 10:59 AM
    #9
    tony2018

    tony2018 Well-Known Member

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    Ouch, your secondary o2 must be reading some fucked up shit.
     
  10. Oct 12, 2017 at 11:02 AM
    #10
    AK1stGen

    AK1stGen [OP] Active Member

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    I just get a cat inefficiency code, but it has never affected the proformance of the engine.
     
  11. Oct 12, 2017 at 11:03 AM
    #11
    tony2018

    tony2018 Well-Known Member

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    I would make sure you have no exhaust leaks.
     
  12. Oct 12, 2017 at 11:04 AM
    #12
    AK1stGen

    AK1stGen [OP] Active Member

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    I have one small exhaust leak in the muffler
     
  13. Oct 12, 2017 at 11:11 AM
    #13
    Bulldogs129

    Bulldogs129 There's no cure for Tacoma fever...

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    Any help?
     
  14. Oct 12, 2017 at 11:14 AM
    #14
    Bulldogs129

    Bulldogs129 There's no cure for Tacoma fever...

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    @AK1stGen
    How’s the head gaskets? There’s a few ways to test...
     
  15. Oct 12, 2017 at 11:27 AM
    #15
    AK1stGen

    AK1stGen [OP] Active Member

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    I've done a compression check and there's no oil in the coolant and no coolant in the oil. So that rules out head gasket. Compression was between 170 and 175.
     
  16. Oct 12, 2017 at 11:27 AM
    #16
    Glamisman

    Glamisman Well-Known Member

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    after all of the parts replaced the only thing I can think of off the top of my head is the fuel pressure regulator... pull the vacuum line and see if there is gas coming out of it or in the line.
     
  17. Oct 12, 2017 at 11:32 AM
    #17
    AK1stGen

    AK1stGen [OP] Active Member

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    I'll check the regulaator, so when I pull the vacume line off gas should be coming out the return line? Is this with the engine off? I'm little confused with what you meant by that
     
  18. Oct 12, 2017 at 11:33 AM
    #18
    Bulldogs129

    Bulldogs129 There's no cure for Tacoma fever...

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  19. Oct 12, 2017 at 11:34 AM
    #19
    Speedytech7

    Speedytech7 Wheeler in Training

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    How is your catalytic converter? If you hold it up to the sun can you see through it?
     
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  20. Oct 12, 2017 at 11:39 AM
    #20
    RedManRocket

    RedManRocket Well-Known Member

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    He said they're gutted I believe?
     
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