Coil packs how long do they last?

[blue62]

Originally Posted by Boxstard

OK I stand corrected but coil failure is still easily diagnosed with the CEL code for misfiring. Intermittent failure/ misfiring can be felt, if it does not trigger CEL. Ilm still skeptical if ‘weak’ spark from an aged coil can appreciably reduce engine power, and if so what characteristics one can check on a coil and justify replacement.

Start with a visual inspection.
I always use a flashlight.
If they have any type of physical damage like cracks in the housing (even hairline cracks) I replace them.

A simple test you can do on a coil yourself is an Ohm's resistance test.
If a coil doesn't meet manufactures spec. it should be replaced.
You can usually find the manufactures spec on the internet.
All you need for the test is a Digital multi meter.
If you do your own auto work you should have a Digital multi meter in your tool box.