coil

  1. Drac Morbis

    Misfiring again, full tune-up?!

    It was misfiring on cylinder 5 some time ago. A new spark plug, coil, and injector cleaning fixed it. It ran like a race horse for months and months. Now it's misfiring on cylinder 3. The mechanic I use said he'll do a full tune-up this time, all new spark plugs, plus a new coil for number 3...
  2. booksix

    2005 Expedition: 40mph shudder, low mpg, stall

    I've had a few issues pop up lately - going to try to explain in chronological order. Things to know: The truck runs amazingly well (smooth and powerful), trans shifts great, no real issues. 230k on the odometer. 4R75e, 4wd, towing package. Plugs 50k ago, Trans-pan fluid and filter 50k ago...
  3. chrono

    2017 3.5L V6 - Misfires While Accelerating

    I got this truck 2 months ago with 50k miles on it. About 3k miles later, I started noticing misfires or "pinging" in two situations: (a) when accelerating at highway speeds, like while passing, and (b) when climbing hills. Eventually I had enough misfires to trigger a persistent Check Engine...
  4. Texas Dave

    COP (coil) mystery?

    In the past year I have had to replace the coil on cylinder 7 of my 5.4L 2007 Expedition three times. It begins with a stumble when accelerating which sets off a misfire on cylinder 7 code. I replace the coil and the engine runs great for a few months. I have also replaced the wiring connector...

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