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Need a Little Help, Can Someone Measure Secondary Coil Resistance

Discussion in '1st Gen. Tacomas (1995-2004)' started by jberry813, Jan 1, 2013.

  1. Jan 1, 2013 at 5:26 PM
    #1
    jberry813

    jberry813 [OP] Professional Fluffer Moderator

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    Ok guys, I've been trying to isolate a problem with my truck, and I've come across a bit of nuance. I'm going through the FSM to test the coils, and I've come up with an anomaly. Below shows how to test the coils for the 5vz V6 engine.

    ”Cold” is from 14°F (–10°C) to 122°F (50°C) and ”Hot” is from 122°F (50°C) to 212°F (100°C).

    ScreenHunter_03Jan011714_zps4a81821a_6318f8bd4f10583ca6cbcc559dd140dad2f5391c.jpg

    Primary coil resistance on my coils tests fine. However the secondary resistance is way off. On all 3 of my coils, the secondary resistance is testing out in the magnitude of kilohms instead of ohms. So either all three of my coils are completely fucked, or the FSM is wrong in not one, but two spots. It wouldn't be the first mistake I've found in the FSM, but I'd like some confirmation.

    Would anyone with an ohmmeter be willing to pull off one of their coils and measure the secondary resistance as outlined in the diagram above and report back? Only requires a 10mm socket to remove the coil and a small flat blade screwdriver to pop the end of the plug wire off. Rep and accolades provided!

    Thanks
     
  2. Jan 1, 2013 at 5:38 PM
    #2
    Blackdawg

    Blackdawg Dr. Frankenstein

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    I can do it i think..

    So you just need the resistance from the output of the secondary coil?? Like where the wire goes?

    i can do that later tonight man.

    how do i test it hot?
     
  3. Jan 1, 2013 at 5:40 PM
    #3
    tacomakid96

    tacomakid96 Lions Not Sheep

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    My meter is at school and the insurance company owns my truck now haha, goodluck man
     
  4. Jan 1, 2013 at 5:44 PM
    #4
    jberry813

    jberry813 [OP] Professional Fluffer Moderator

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    Test the resistance exactly as depicted in the bottom part of the picture I posted. One end of the meter will be inserted into where the spark plug would be at, the other end of the meter touches where the spark plug wire would attached.

    Can be done hot or cold, just let me know what the resistance your meter shows and whether it was hot or cold.
     
  5. Jan 1, 2013 at 6:43 PM
    #5
    MapleMoose

    MapleMoose Drunk Canadian

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    bump for fellow 1st gen


    Whats the problem? Misfire?
     
  6. Jan 1, 2013 at 6:55 PM
    #6
    smuook

    smuook Daily Driver "Plus"

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    I wouldn't worry about testing both hot and cold... they are just nominal values depending on the particular temp (resistance goes up if it's hotter). As long as you are within 10 and 20 ohms the coil is probably fine. I assume your are looking for either a short (0 ohms) or an open (infinite) to let you know you have a bad coil.
     
  7. Jan 1, 2013 at 6:59 PM
    #7
    smuook

    smuook Daily Driver "Plus"

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    Kilohms would effectively be an open (can depend on quality and operation of meter used as to open indication) or you are not touching the contact surfaces properly.
     
  8. Jan 1, 2013 at 7:46 PM
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    Blackdawg

    Blackdawg Dr. Frankenstein

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    Aright will do. Ill post back in 30mins or so n just getting done with dinner
     
  9. Jan 1, 2013 at 8:14 PM
    #9
    Blackdawg

    Blackdawg Dr. Frankenstein

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    Here Jason

    Hope this helps and I did it right. Let me know it it's wrong.

    Ohm meter set to 200k...so..yea..

    265eb24223a692db54f75854b98913e8_fd91717306867f62bf0c42dd336018bd0d96be5e.jpg
     
  10. Jan 1, 2013 at 8:48 PM
    #10
    jberry813

    jberry813 [OP] Professional Fluffer Moderator

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    Actually yeah, it feels very similar to a missfire, but not exactly. Its more of a thrusting/surging feeling. Only happens under moderate acceleration or going uphill. At WOT sometimes it feels normal, sometimes the truck feels absolutely gutless. Seriously ,my truck feels like a 4 banger right now instead of a supercharged v6.

    I wasn't worried about testing both hot and cold. I just provided the hot and cold values specified by the FSM to correlate to the acceptable ranges of resistance depending on whether the coils are hot or cold.

    Thanks Monte!
    You definitely have it hooked up correctly. Since you have the meter set at 200k, that means the resistance measured is 12.5 kilohms right? Which is right on par with what I'm measuring my coils at with my Fluke. Looks like the FSM is wrong.

    Back to the drawing board.....

    [​IMG]
     
  11. Jan 1, 2013 at 8:49 PM
    #11
    Blackdawg

    Blackdawg Dr. Frankenstein

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    Right that's what I thought too..

    Kinda odd..
     
  12. Jan 1, 2013 at 8:57 PM
    #12
    jberry813

    jberry813 [OP] Professional Fluffer Moderator

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    Yeah I really didn't think I had all three coils took a shit at the exact same time, but anything is possible.
    Damn truck. I hate and love the bitch equally. :annoyed:
     
  13. Jan 1, 2013 at 9:03 PM
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    MapleMoose

    MapleMoose Drunk Canadian

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    Hows your millage? Notice a drop in efficiency?
     
  14. Jan 1, 2013 at 9:05 PM
    #14
    Blackdawg

    Blackdawg Dr. Frankenstein

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    Well my mileage sucks no doubt..but I only have 117k..

    If yours are out Jason..mine would be too
     
  15. Jan 2, 2013 at 6:04 PM
    #15
    hayabusa3303

    hayabusa3303 Well-Known Member

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    Coils are not the problem volt meter wise. Look at the boots closely for cracks.. Move them around see if you see any.

    Check this engine running and do it at night check to see if you have a ARC coming out of one of the coils going to like the valve cover. If you do the epoxy in the coils is bad replace coil. ( its very rare this happens). Check wires too.

    When was the last time fuel filter was changed? Your surge is coming from the fuel system. Pump, filter, reg for fuel.. Could be even a injector sticking. How does your plugs look??
     
  16. Jan 2, 2013 at 9:16 PM
    #16
    jberry813

    jberry813 [OP] Professional Fluffer Moderator

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    Thanks for the ideas. I started to respond but realized it may be better off just to start a new thread as this thread title is misleading. I answered your questions here:

    http://www.tacomaworld.com/forum/1s...ing-thrusting-problem-under-acceleration.html
     

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