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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.

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  1. Oct 12, 2017 at 11:41 AM
    #21
    RedManRocket

    #21
    RedManRocket Well-Known Member

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    Yup
     
    RedManRocket, Oct 12, 2017
    #21
  2. Oct 12, 2017 at 11:43 AM
    #22
    AK1stGen

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    AK1stGen [OP] Active Member

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    Gas is fine, I drained the rest out when I did the fuel pump and put in fresh gas
     
    AK1stGen, Oct 12, 2017
    #22
  3. Oct 12, 2017 at 11:43 AM
    #23
    AK1stGen

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    AK1stGen [OP] Active Member

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    Yes cats are gutted
     
    AK1stGen, Oct 12, 2017
    #23
  4. Oct 12, 2017 at 11:47 AM
    #24
    Rons01TRD

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    Rons01TRD Well-Known Member

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    Throttle Position sensor maybe???:notsure:
     
    Rons01TRD, Oct 12, 2017
    #24
  5. Oct 12, 2017 at 11:47 AM
    #25
    Speedytech7

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    Speedytech7 Toyota Cult Ombudsman

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    I've done a mod or two
    Sounds like timing is off tooth or two then
     
    Speedytech7, Oct 12, 2017
    #25
    randd likes this.
  6. Oct 12, 2017 at 11:47 AM
    #26
    AK1stGen

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    AK1stGen [OP] Active Member

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    - Replaced
     
    AK1stGen, Oct 12, 2017
    #26
  7. Oct 12, 2017 at 11:49 AM
    #27
    AK1stGen

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    AK1stGen [OP] Active Member

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    Checked timing yesterday
     
    AK1stGen, Oct 12, 2017
    #27
  8. Oct 12, 2017 at 11:51 AM
    #28
    Rons01TRD

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    Rons01TRD Well-Known Member

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    If I am not mistaken there are a couple of different types of TPS Sensors, I believe the 2001's are different than the 2003/04 3.4's...just putting this out there to help....
     
    Rons01TRD, Oct 12, 2017
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  9. Oct 12, 2017 at 11:51 AM
    #29
    Speedytech7

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    Speedytech7 Toyota Cult Ombudsman

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    I've done a mod or two
    You check belt tension too?
     
    Speedytech7, Oct 12, 2017
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  10. Oct 12, 2017 at 11:52 AM
    #30
    Brice

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    Brice Turbo Member

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    Do you have a scangauge or anything that can read fuel trims?
     
    Brice, Oct 12, 2017
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  11. Oct 12, 2017 at 11:52 AM
    #31
    Rons01TRD

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    Rons01TRD Well-Known Member

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    How about your MAF sensor????
     
    Rons01TRD, Oct 12, 2017
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  12. Oct 12, 2017 at 11:53 AM
    #32
    Brice

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    Did you even read the first page???
     
    Brice, Oct 12, 2017
    #32
  13. Oct 12, 2017 at 11:58 AM
    #33
    AK1stGen

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    AK1stGen [OP] Active Member

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    I am aware of that

    Belt tension was good, tensioner was replaced with timing belt 2000 miles ago

    I don't, I can possible barrow one, what would I be looking for in fuel trims. I'm not smart when it comes to the computer diagnostics
     
    AK1stGen, Oct 12, 2017
    #33
  14. Oct 12, 2017 at 12:01 PM
    #34
    Brice

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    It would help determine how hard the ECU is working to keep the truck at a 14.7:1 AFR. For instacne if the values were like +(-)20 you would know that you are way rich or way lean (negative trims being rich and positive ones being lean)
     
    Brice, Oct 12, 2017
    #34
  15. Oct 12, 2017 at 12:03 PM
    #35
    AK1stGen

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    AK1stGen [OP] Active Member

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    Okay I'll see what I can do about barrowing a scan tool
     
    AK1stGen, Oct 12, 2017
    #35
    Brice[QUOTED] likes this.
  16. Oct 12, 2017 at 12:07 PM
    #36
    Bulldogs129

    #36
    Bulldogs129 Don't find fault, find a remedy

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    All the symptoms sound like a failing MAF....I know you replaced it, but dog-gone it sure sounds like the problem. Do you have a warranty on the new MAF?
     
    Bulldogs129, Oct 12, 2017
    #36
  17. Oct 12, 2017 at 12:16 PM
    #37
    Brice

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    Brice Turbo Member

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    I thought this as well.
     
    Brice, Oct 12, 2017
    #37
    Bulldogs129[QUOTED] likes this.
  18. Oct 12, 2017 at 12:19 PM
    #38
    AK1stGen

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    AK1stGen [OP] Active Member

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    I'll try replacing it again
     
    AK1stGen, Oct 12, 2017
    #38
  19. Oct 12, 2017 at 12:28 PM
    #39
    Bulldogs129

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    Bulldogs129 Don't find fault, find a remedy

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    Bulldogs129, Oct 12, 2017
    #39
  20. Oct 12, 2017 at 2:39 PM
    #40
    Glamisman

    #40
    Glamisman Well-Known Member

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    No, there should be no fuel at the vacuum line. If there is it means the rubber diaphram is broken. Engine on ONLY to check for the presence of vacuum at the line.
     

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    Glamisman, Oct 12, 2017
    #40
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