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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.

Page 5 of 6
  1. Oct 13, 2017 at 9:17 PM
    #81
    mechanicjon

    #81
    mechanicjon They call me "Jonny Stubs"

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    12.5 would be on the lean side. Have you checked fuel pressure woth a gauge?
     
    mechanicjon, Oct 13, 2017
    #81
  2. Oct 13, 2017 at 11:15 PM
    #82
    AK1stGen

    #82
    AK1stGen [OP] Active Member

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    Yes, 35psi

    LT FTRM1 is not at -.8 at idle and ST FTRM1 is 0.8
     
    AK1stGen, Oct 13, 2017
    #82
  3. Oct 13, 2017 at 11:16 PM
    #83
    AK1stGen

    #83
    AK1stGen [OP] Active Member

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    Also ignition advance is 18.5 degrees, that seems high to me but I don't know what it should be at idle.
     
    AK1stGen, Oct 13, 2017
    #83
  4. Oct 14, 2017 at 9:25 AM
    #84
    mechanicjon

    #84
    mechanicjon They call me "Jonny Stubs"

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    I believe 35psi is low. Don't have access to a FSM right now. 38 to 44psi is spec. i think.
     
    mechanicjon, Oct 14, 2017
    #84
    Brice likes this.
  5. Oct 14, 2017 at 11:15 AM
    #85
    AK1stGen

    #85
    AK1stGen [OP] Active Member

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    It's with in spec, 32-38 is what it's supposed
     
    AK1stGen, Oct 14, 2017
    #85
  6. Oct 14, 2017 at 12:56 PM
    #86
    AK1stGen

    #86
    AK1stGen [OP] Active Member

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    32-38psi is spec

    I was wondering if anyone know what the throttle position is suppose to read at idle and WOT, with my scanner hooked up in reading 11% at idle and only 76% at WOT. I know I replaced the throttle position sensor but this seems off
     
    AK1stGen, Oct 14, 2017
    #86
  7. Oct 14, 2017 at 1:21 PM
    #87
    AK1stGen

    #87
    AK1stGen [OP] Active Member

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    Nevermind on that, this is within spec.
     
    AK1stGen, Oct 14, 2017
    #87
  8. Oct 14, 2017 at 9:31 PM
    #88
    Brice

    #88
    Brice Turbo Member

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    I believe this spec is actually correct. I have to find the sheet that says so though...
     
    Brice, Oct 14, 2017
    #88
  9. Oct 14, 2017 at 11:22 PM
    #89
    mechanicjon

    #89
    mechanicjon They call me "Jonny Stubs"

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    mechanicjon, Oct 14, 2017
    #89
  10. Oct 14, 2017 at 11:25 PM
    #90
    Dalandser

    #90
    Dalandser ¡Me Gustan Las Tacos-mas!

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    From: FSM says 38-44 psi with ignition on, 33-38 psi at idle, and 38-44 psi with the vacuum sensing hose to the regulator disconnected.
     
    Dalandser, Oct 14, 2017
    #90
  11. Oct 14, 2017 at 11:30 PM
    #91
    mechanicjon

    #91
    mechanicjon They call me "Jonny Stubs"

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    Our 3.4v6 doesn't have vacuum to the fuel pressure regulator.
     
    mechanicjon, Oct 14, 2017
    #91
  12. Oct 14, 2017 at 11:31 PM
    #92
    mechanicjon

    #92
    mechanicjon They call me "Jonny Stubs"

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    Edit
     
    mechanicjon, Oct 14, 2017
    #92
  13. Oct 14, 2017 at 11:45 PM
    #93
    Dalandser

    #93
    Dalandser ¡Me Gustan Las Tacos-mas!

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    My $Free.50 version only had torque specs. Other forum says:

    "I believe factory specs are 38-42psi as measured on the fuel rail at the front of the motor. "
     
    Dalandser, Oct 14, 2017
    #93
  14. Oct 14, 2017 at 11:49 PM
    #94
    Dalandser

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    Dalandser ¡Me Gustan Las Tacos-mas!

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    Isn't there a line that goes from the intake to it? Noob on that stuff though.
     
    Dalandser, Oct 14, 2017
    #94
  15. Oct 15, 2017 at 12:08 AM
    #95
    BartMaster1234

    #95
    BartMaster1234 American Auto Horns

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    Darn late to the party haha. I only have AllData Pro access at my local college - I usually just park in their parking lot and get what I need to get.
     
    BartMaster1234, Oct 15, 2017
    #95
  16. Oct 15, 2017 at 12:16 AM
    #96
    mechanicjon

    #96
    mechanicjon They call me "Jonny Stubs"

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    The line runs to the intake tube before throttle body. No vacuum to it.
     
    mechanicjon, Oct 15, 2017
    #96
    Dalandser[QUOTED] likes this.
  17. Oct 15, 2017 at 12:17 AM
    #97
    mechanicjon

    #97
    mechanicjon They call me "Jonny Stubs"

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    You don't have the FSM?
     
    mechanicjon, Oct 15, 2017
    #97
  18. Oct 15, 2017 at 12:23 AM
    #98
    BartMaster1234

    #98
    BartMaster1234 American Auto Horns

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    oh duh I totally forgot about that. you still need it? I can look it up
     
    BartMaster1234, Oct 15, 2017
    #98
  19. Oct 15, 2017 at 12:23 AM
    #99
    mechanicjon

    #99
    mechanicjon They call me "Jonny Stubs"

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    Nah D got it.
     
    mechanicjon, Oct 15, 2017
    #99
  20. Oct 17, 2017 at 10:02 AM
    #100
    Bulldogs129

    #100
    Bulldogs129 Don't find fault, find a remedy

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    @AK1stGen what's the latest...any progress or updates? are you :burnrubber:yet?
     
    Bulldogs129, Oct 17, 2017
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