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Motor Missfiring problems

Discussion in '1st Gen. Tacomas (1995-2004)' started by jalsum, Aug 11, 2011.

  1. Aug 11, 2011 at 8:16 PM
    #1
    jalsum

    jalsum [OP] Member

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    Howdy everybody! This is my 1st post and I appreciate any help i can get.
    I bought my sisters used 97 T100 v6 S/C with both heads blown.I got a pull out 96 t100 motor from the local junkyard, and swapped it out leaving it normal aspirated. With motor in, vacuum lines matching the 97's diagram, i started it up. motor fired up 1st try but is missing. The truck is throwing 2 codes. First is a PO450 (Evaporative Emission Control System Pressure Sensor Malfunction) and P0306 (misfire on cylinder #6.)

    I'm not to worried about the p0450 right now, but im trying to get the misfire tackled.

    I have Replaced with new spark plugs
    Swapped coil packs with wires
    Swapped injector 1 to 2 ……3 to 4 … 5 to 6
    Check coil ohms on injector 13 ohms (all 6 where 13ohms)
    Check voltage from ECU that feeds # 6 injector 12vdc
    Checked for any loose grounds
    replaced fuel pressure regulator
    Check compression 130psi on all 6 cylinders

    Still misfiring on #6 and p0450

    Any ideas before i pull the head and look for anything screwy with the valves? I know this is not a tacoma and this is a tacoma fourm, but the motors are pretty close to being the same.
    Thanks in advance!
     
  2. Aug 11, 2011 at 11:36 PM
    #2
    4WD

    4WD cRaZy oLdmAn

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    Grey wire MOD, deck plate, diff breather MOD, 2nd gen. OME 883# on Tundra 5100's, OMD custom 3" leafsprings, rear shock relocation, Ivan Stewart TRD rims w/285/75/16's, '02 bumper MOD, Famous Fabrications sliders , LED interior/exterior lights, bed bar, Custom tube bumper, Old school KC day lighters,Red Ring 8" HID flood, Kenwood vhf 2M.. umm some other shit I'm forgetting right now
    Hmm, sounds like you're doing all the right things, but I'm curious, you say the other motor was super charged is there any MODS done electrically to ECU necessary to accomodate a super charger ?? :notsure:
     
  3. Aug 12, 2011 at 7:01 AM
    #3
    jalsum

    jalsum [OP] Member

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    No MODS that I know of. The supercharger was installed at a Toyota dealer ten years ago.
     
  4. Aug 14, 2011 at 1:03 PM
    #4
    jalsum

    jalsum [OP] Member

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    I got my code reader back today and hooked it up. It was reading fuel trims at 0%(long and short), and was reading o volts for the 02 senser.
    I'm going back right now and checking all the connections for the 02s, but is there anything else that i should check?
    Thanks
     
  5. Aug 14, 2011 at 1:46 PM
    #5
    jalsum

    jalsum [OP] Member

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    OK cancel that last post. The code readers batteries were bad... now hooked up running will throw PO306.. and when the truck starts to warm up, roughly 150f coolant temp. It throws p0304 (cylinder 4) and p0300(random misfire) and runs really rough and the check engine light flashes.:mad: So i turned it off. I'm still not having the truck adjust its fuel trims. Which i dont know if it would with misfires recorded. Just for fun i switched out this trucks ECU with my Soon to be race motors ecu and it still failed so i'm eliminated that option....so im left with more questions than answers..lol any ideas?
     
  6. Aug 14, 2011 at 1:50 PM
    #6
    4WD

    4WD cRaZy oLdmAn

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    Damn bro' , aint that the way it always goes, eletrical issues are found in 1 of 2 ways.... You either find it right away or bring your lunch cause its going to be a looooong day !!:eek:
     
  7. Aug 14, 2011 at 1:59 PM
    #7
    jalsum

    jalsum [OP] Member

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    Haha aint that the truth. Well i am going to try to change out the fuel filter since i know its never been changed. Wish i could check fuel pressure, but theres no tap, and the dealer says the union you need, does not exist.:rolleyes:
     
  8. Aug 19, 2011 at 1:30 PM
    #8
    jalsum

    jalsum [OP] Member

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    OK update time. Found out from when the last motor blew, water leaked into the muffler and cat. Went and drove it for about a half hour to get the exhaust all cleared, no more smoke.:) Motor seams to be doing good while driving, but will misfire while idling, and will throw misfire 1-6 randomly. Its a real bad idle at 700 rpms and running really rough with and without the ac on. Cleaned the MAS and when driving still running really rough, but has not died at a light yet any other ideas? :help:
     
  9. Aug 19, 2011 at 1:50 PM
    #9
    hayabusa3303

    hayabusa3303 Well-Known Member

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    If the ecm was flashed at the dealer for a supercharger in turn the ecm is looking for a boost and that could be the reason behind it.


    What are the current codes it is sending now?

    EDIT: check all your grounds to battery with a meter on the engine. Check for any RUST around the ground.
     
  10. Aug 19, 2011 at 2:13 PM
    #10
    jalsum

    jalsum [OP] Member

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    Codes are P0300,1,2,3,4,5,6

    But mostly P0300 P0304, P0306.
    The motor runs smoothly around 900 RPMs but anything below that is rough.
    I did plug in my Tacoma's 97 v6 factory ECU with the same results.
     
  11. Aug 19, 2011 at 2:26 PM
    #11
    hayabusa3303

    hayabusa3303 Well-Known Member

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    OK then ecu is out.


    Things off the top of my head that would make it do this.

    Check, With a meter check BOTH coils on one coil pack, check primary , and second coils. Check the spark plug wires... replace if needed

    If those check out OK.

    Check cam shaft sensor, IAC, and TPS. Make sure your TPS is set correct. IF not the ECU likes to play a hunting game on idle also.

    Even tho the injectors are ok by the coils you have have a bad disk in the injector it would not show up on the volt meter. with the engine idle see if you hear one of the injectors ticking real loud.
     
  12. Aug 19, 2011 at 2:36 PM
    #12
    jberry813

    jberry813 The Mad Scientist

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    ECM is not flashable on first gens.


    OP, what plugs did you put in and what did you gap them at?

    Did you reuse all old vacuum hoses or use new ones. Check for leaks especially the one on fuel pressure regulator. Misfire codes on yota motors are not uncommon for bad fuel pressure regulators or vacuum leaks on it. If you still have the old motor might want to swap the fuel pressure regulator over.


    EDIT:
    Doh...just saw u did fuel presssure reg already
     
  13. Aug 19, 2011 at 4:20 PM
    #13
    jalsum

    jalsum [OP] Member

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    I used what the all knowing auto zone computer told me what was required. they were a single electrode, pre-gaped() i was told i could not re gap. and i threw away the box..but i thought there where .41...but i dont know for sure. i can pull one out when it cools and check?
     
  14. Aug 19, 2011 at 4:44 PM
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    jberry813

    jberry813 The Mad Scientist

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    Vatozone are retards. Take em back. You Are supposed to run twin grounded plugs only. Ngk or denso recommended
     
  15. Aug 19, 2011 at 6:27 PM
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    hayabusa3303

    hayabusa3303 Well-Known Member

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  16. Aug 19, 2011 at 9:59 PM
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    SCSPerformance

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    my brother has a '02 2.7L that developed similar symptoms at ~240k miles that we couldn't track down. it was showing everything that told us it was burnt valves, but my brother didn't want to accept it. after trying everything, he finally got a friend to tear the top end off. surprise, 2 burnt valves. he got the head rebuilt and all is good now.
     
  17. Sep 2, 2011 at 5:04 PM
    #17
    jalsum

    jalsum [OP] Member

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    OK conclusion time! Long story short the only problem was the wires on #6, #4 were backwards :smack: i followed the diagram in the Chilton's manual which was, well not 100% accurate. Switched over, now it runs like a sewing machine! :D thanks for everybody's help!
     
  18. Sep 2, 2011 at 6:46 PM
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    Monkeysuncle

    Monkeysuncle My Cat's breath Smells like Cat Food

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  19. Sep 2, 2011 at 8:45 PM
    #19
    jberry813

    jberry813 The Mad Scientist

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    Werd!

    Use the chilton manual to mop up spilt oil and stick with the FSM. :D
     
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