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HELP!!! bad bucking and jerking

Discussion in '1st Gen. Tacomas (1995-2004)' started by tacocass, Apr 21, 2013.

  1. Apr 21, 2013 at 12:20 PM
    #1
    tacocass

    tacocass [OP] Active Member

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    cass
    okie-homa
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    taco sr5 4X4 3.4V6
    BIL 5100'S, PRO-COMP 1" REAR BLOCK, DECK PLATE MOD W/ KN
    First, 02 Taco 4x4 3.4l: I was driving in second gear yesterday coming off a stop and went wot to pass someone. Next thing I know the check engine light is flashing at me, and the vehicle is violently bucking... Since yesterday, I have changed all 3 coils, plugs, wires, fuel filter, pcv, and maf... No change and all are oe componets. The vehicle starts and idles fine. It only misfires under load( climbing a hill or in first gear), or wot. It will only misfire after 2300rpm. Please help this is my dd... I am lost.
     
  2. Apr 21, 2013 at 12:21 PM
    #2
    tacocass

    tacocass [OP] Active Member

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    BIL 5100'S, PRO-COMP 1" REAR BLOCK, DECK PLATE MOD W/ KN
    oh ya and no stored or present codes...
     
  3. Apr 21, 2013 at 12:43 PM
    #3
    Aught2TaCO

    Aught2TaCO Well-Known Member

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    None... yet.
    Has the timing belt been changed? Don't know if it is that, I'm just throwing it out there.
     
  4. Apr 21, 2013 at 12:46 PM
    #4
    2000GTacoma

    2000GTacoma Well-Known Member

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    don't think the timing belt would cause this. If it jumped time it would run bad at idle...maybe a fuel delivery issue or spark issue.
     
  5. Apr 21, 2013 at 12:52 PM
    #5
    Aught2TaCO

    Aught2TaCO Well-Known Member

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    None... yet.
    Just thought of that after I hit enter lol. I was thinking of valve float at high RPM, but that happens primarily with pushrod engines that I'm more familiar with.
     
    Last edited: Apr 21, 2013
  6. Apr 21, 2013 at 12:55 PM
    #6
    newertoy

    newertoy Well-Known Member

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    East Tn
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    2" lift AAL and Bilstiens-front-rear,front diff drop. main drive drop
    HMMM !
     
  7. Apr 21, 2013 at 1:03 PM
    #7
    tacocass

    tacocass [OP] Active Member

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    BIL 5100'S, PRO-COMP 1" REAR BLOCK, DECK PLATE MOD W/ KN
    The timing belt was replaced 2000 miles ago. The truck only has 91k. Just removed the timing cover and it hasn't jumped time... It feels like it hits a wall when it misses... Just removed both cam and crank sensors, no cracks in them...
     
  8. Apr 21, 2013 at 1:04 PM
    #8
    tacocass

    tacocass [OP] Active Member

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    BIL 5100'S, PRO-COMP 1" REAR BLOCK, DECK PLATE MOD W/ KN
    I would say valve float, but this is happening around 2500rpm and up...
     
  9. Apr 21, 2013 at 1:08 PM
    #9
    camt10

    camt10 Well-Known Member

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    Lights flashing indicating catalyst poss damage usually indicating lean mixture if you have access to a fuel gage attach and monitor under load see what psi is doing. That's a start also if u have access to a cheapo scan tool see what fuel trim and oxygen sensor readings r
     
  10. Apr 21, 2013 at 1:13 PM
    #10
    Aught2TaCO

    Aught2TaCO Well-Known Member

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    None... yet.
    I was pondering fuel pressure too.
     
  11. Apr 21, 2013 at 3:11 PM
    #11
    tacocass

    tacocass [OP] Active Member

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    BIL 5100'S, PRO-COMP 1" REAR BLOCK, DECK PLATE MOD W/ KN
    Update, p1135 o2 code just popped up... Going to Advance to pick up a denso sensor. Thanks to any and all who have helped so far. What is fuel pressure supposed to be? I did not see any test ports on the fuel rail?
     
  12. Apr 21, 2013 at 3:45 PM
    #12
    camt10

    camt10 Well-Known Member

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    Did u test the sensor output,ie resistance check could be bad if its original which sensor is that can't remember is that pre cat or post.fuel psi if I remember is around 40 either way should be constant what u would be looking for if it was an issue is drastic decrease when engine exhibits mis.no fuel Schrader u have to tee in to fuel line.who knows you might get lucky with o2 sensor if u need specific info I can get it at work tommorrow.
     
  13. Apr 21, 2013 at 4:24 PM
    #13
    tacocass

    tacocass [OP] Active Member

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    BIL 5100'S, PRO-COMP 1" REAR BLOCK, DECK PLATE MOD W/ KN
    Short term is 0% lt is 10.2%... My upstream sensor 1 o2 is showing 0v at idle. When throttle is pressed it hits .72v. I'm gonna start there and hope this works...
     
  14. Apr 21, 2013 at 4:35 PM
    #14
    camt10

    camt10 Well-Known Member

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    At 2k rpm does the sensor cycle or stay constant o2s should cycle
     
  15. Apr 21, 2013 at 5:06 PM
    #15
    tacocass

    tacocass [OP] Active Member

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    BIL 5100'S, PRO-COMP 1" REAR BLOCK, DECK PLATE MOD W/ KN
    cycles .2-.4v
     
  16. Apr 21, 2013 at 5:31 PM
    #16
    camt10

    camt10 Well-Known Member

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    Check that the sensor has its full range ie lean mixture out see out put
    Richer check output
     
  17. Apr 21, 2013 at 6:24 PM
    #17
    tacocass

    tacocass [OP] Active Member

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    BIL 5100'S, PRO-COMP 1" REAR BLOCK, DECK PLATE MOD W/ KN
    Well trying to remove the sensor the stud to the converter broke, cross threaded... Whomever owned this taco before me did a number. Found an exhaust leak near the sensor, and it's a Bosch 02... The factory converter looked to be running pretty hot, gonna change it.
     
  18. Apr 21, 2013 at 6:47 PM
    #18
    camt10

    camt10 Well-Known Member

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    Is the element in cat melted? They do run pretty hot,also what stud,mounting stud for 02?
     
  19. Apr 21, 2013 at 7:08 PM
    #19
    tacocass

    tacocass [OP] Active Member

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    BIL 5100'S, PRO-COMP 1" REAR BLOCK, DECK PLATE MOD W/ KN

    ya stud for the dang o2... The cat was almost glowing red, and caked with red clay! I've been scraping clay off of this thing since I bought it. I don't know if the element is melted, but I dont see how else to replace the stud...
     
  20. Apr 21, 2013 at 7:12 PM
    #20
    camt10

    camt10 Well-Known Member

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    Is the stud flush or some sticking up
     
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