[Boxstard]

Originally Posted by blue62

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.

I know continuity and resistance are two different things, but effectively you are checking both at the same time when you are checking coils with a multimeter for breakage, short or insulation leakage.

I agree that you can waste time doing all those tests to pin point the coil issue when you can just buy new ones and forget about it, ‘if you have any doubt’…. my point is how to confirm that doubt by reasonable test so that you don’t end up just replacing perfectly good coils with zero appreciable improvement. They are not expensive, it just bothers me wasting good parts, just because I can replace them.