Coil packs how long do they last?

[blue62]

Originally Posted by Boxstard

Yeah that’s pretty basic…. For me cracking can be repaired and may not warrant automatic replacement, if you catch it early. Body crack can be filled with epoxy, and tube can be insulated with electric tape. One of mine had tube split and taping it up works fine.

I do have a multimeter, but just wondering how to tell actual degradation, instead of just continuity of the coil. Variation in reading within the spec. may come from manufacturing tolerance, instead of aging. If the coils with resistance within the spec. can still produce weak spark, then the check is not effective and I wonder what else can be checked.

Continuity and Ohm's resistance are not the same thing.
They are two different tests.
If you have a variation in reading "within the spec." your still within spec.
Any spec. has an allowable tolerance.
Primary and secondary Ohm's resistance can be checked with a Multimeter.
Spark color can be checked with a simple spark checker.
You want a fat blue spark not a weak yellow spark.
You can do a cylinder power balance test to see if a coil is possibly having a negative power balance effect on the engine.
You can have the coils scoped.

But in my opinion at less then $50.00 apiece shipped to my front door. If I have doubts about the condition of a coil I replace them.
Anything else is penny wise and pound foolish.