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2014 Expedition Misfired twice

Discussion in '3rd Gen - 2007 - 2017' started by Crixus12, Jan 24, 2021.

  1. Crixus12

    Crixus12 New Member

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    Do you change the plugs and boots that often or just the plugs?
     
  2. vincentrose

    vincentrose Full Access Members

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    Yep, I purchased a 2014 in August, and it was doing the same thing to me. Floor it, Check engine flashes, Stored misfire code, (I think in Cylinder 1&2). New plugs cured the problem. Old plugs were so worn out, some of them had a gap 1/8 inch to 1/4 inch wide, its a wonder they were firing at all. 8 new plugs later, purrs like a kitten, and roars like a lion when you floor it!!!
     
  3. 07navi

    07navi Full Access Members

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    Just the plugs and any boot that is shot which is usually none. I'm a "if it ain't broke don't fix it" kinda' guy and it has served me well. I also keep the plugs holes immaculate with a wood dowel, cloth, solvent, and drill setup. Dirty/wet plug holes are hard on boots.
     
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  4. JamaicaJoe

    JamaicaJoe Full Access Members

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    I had the dealer change my plugs only at 45K , a pricey endeavor that did not include the boots. A while later I had misfires again until I replaced the boots. You are not saving money by ignoring the boots. The COP s I would leave alone unless I have a misfire with new plugs and boots. You can swap the COP easy enough to test it.

    Sent from my SM-T350 using Tapatalk
     
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  5. JamaicaJoe

    JamaicaJoe Full Access Members

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    The only reason those bad plugs fire at all is because each ignition sequence is something like 6 strikes of HV. So if the first does not take, 5 more sparks in a row. Of course the timing is delayed.

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  6. 07navi

    07navi Full Access Members

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    ??????????
     
  7. 07navi

    07navi Full Access Members

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    Me? I check them and reuse them if good and never had a problem doing that.
     
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  8. Thunderbirdsport

    Thunderbirdsport Full Access Members

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    There are multiple spark discharges for each instance of a given cylinder being on the firing stroke...surely you of all people ought to know this, with your centuries of automotive repair and millions spent on research....?
     
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  9. 07navi

    07navi Full Access Members

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    Foulmouth couldn't resist trying to belittle me. 30+ posts of harassment:emotions34:
     
  10. Thunderbirdsport

    Thunderbirdsport Full Access Members

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    You always default to this. That aside, you can lecture someone about phasers, but you have no real idea how an ignition works on a modern engine?
    The spark plugs don't just fire once...there are several discharges of electricity. This helps with timing and emissions.

    Ever heard of MSD, the company that makes ignition components for the aftermarket?

    What's in a name..lol
     

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