Yes, a bad spark plug, incorrect type of spark plug, or a wide spark plug gap can cause a coil to fail. If electrical resistance in the secondary ignition circuit is too high the coil must generate a higher voltage to fire the plug.
Until I replaced the plugs, coils, alternator, starter, battery and cleaned connections all I could, this problem persisted and my vehicle killed a coil / 2 every season.
Only issue I’ve had is having 2 spark plugs blow out. The first time required a replacement head and the second was fixed with a helicoil. Most reliable vehicle I have owned.
When I had my Ford Raptor tuned I went with these as recommended by the tuner and they have been superb
I have an aero 50. I don’t recall what’s recommended on it, but when I was living in the Pacific Northwest, I found that while using premium, it ran significantly better. Smoother idle, better acceleration.
I remember the first time I did anything besides oil, it was spark plugs and power steering fluid on my old accord. Starting it up after had me nervous, second guessing everything I did.
And timing belt, and spark plug change every 90 K miles or so.
2005 CVPI...180,000 mi....spark plug blown out of head. The Crown Vic was purchased at auction for $4200 a bunch of years ago with 100,000 miles and was very good to us until about a week ago...original engine, suspension parts, transmission and very few repairs.
I own one of these, and I couldn't have a lower opinion of Fords engineering (the 2v spits out spark plugs? lets "fix" it on the 3v and make it so they will never come out).
econolines are ok except for one huge cluster****. On the late 90s through 02 i think they built them with too few threads on the heads for the spark plugs. Consequently spark plugs routinely blow out.
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