I've got a stumbling / intermittent miss on my '96. I'm going through the checklist of symptoms and checked the coil packs. Remember since this is a '96 I have the (2) 4 coils packs not the COP's.

I check the primary resistance and it's within spec, it reads out @ .9 ohms on both packs and spec is .3 to 1.0

I check the secondary resistance and I'm coming up with anything from 13.1k to 13.25K ohms on both packs. Spec is 6.5k - 11.5k ohms.

Do these usually fail out on with the secondary resistance? I'm just questioning my results as it seems weird that both packs would fail simultaneously. Any thoughts?

 

Testing winding resistance, particularly the secondary, with a low-voltage ohmmeter is only a rudimentary manner of checking a coil, as it does it's works at 10s of kilovolts--however that yours are that far off the spec is not a good sign.

To test it properly get an adjustable gap tester.



A good coil pack should be able to fire across at least a 8-10mm air gap, anything less than that and it is weak. A stock Ford COP can fire across a 16mm gap.