As spark plugs wear and the "gap" increases and the load on the coil pack increases accordingly, ultimately accelerating their failure. The coil pack increases power to the spark plug to always keep it firing, and that gets harder as the gap increases.
Replace your plugs at regular intervals, don't try to squeeze every mile you can out of them and you'll likely increase the lifespan of your coils. I set of spark plugs is a lot cheaper than coil packs.
Dad and I changed the single coil on his 69 Galaxy 500 , 302 cid engine , maybe in the 1970's ?
I may have changed one on one of my cars . Can not remember clearly enough to say for sure .
Truth is , cars , now a days , are running more miles than in my youth . Maybe that has something to do with it ?
In the old days of carbs it was common for the coils to last maybe 50-60k miles before needing to replace it. Those were just cheap cylinder oil filled styles...we would always upgrade a chrome unit lol. Nowadays, I have only noticed that GM 4.2 inlines and 3.6L motors go thru coils often.
Dodge Caliber, had one fail, RockAuto'ed one. Easy to swap out.
RamPromaster company ride, CEL came on, bad miss, failed coil pack. Car was in the shop for a week, excuse was the Fiat coil pack came from Italy.
Chrysler T&C, failed coil on the rear bank gave a CEL. Had all plugs and pack replaced, repair shop said all other coils tested fine. I don't know how coils are tested, took their word on it. And I wasn't going to be the one digging into the rear bank. A man needs to know his limits.
As I'm thinking, all were FCA products that had coils go boink.
My uncle's 2001 F150 4.6 liter would kill the furthest forward one (on the passenger side) with regularity....
We never could figure out why.
My 2008 F150 4.6 has never had one fail with 192,000 miles on it.
When I worked at the Ford dealer mid 2000s we replaced them constantly on the trucks. One employee in our body shop had to replace all of his over a period of a year on a 2003 f150.
I've never seen one fail on a gm truck from the 2000s, or any of the hei coils in my old 1980s cars (knocks on wood).
Some vehicles seem prone to them failing more than others. Change spark plugs more often to prevent failure, is good advice.