Coil packs- any real difference between brands?

[xzl6b1]

Had a misfire, that progressively got worse. O'Reilly auto parts used a Bosch scan tool, and found that the #6 coil was bad.

I removed all 6 coils. all coils were within spec (pin 1-3 resistance primary winding).
Replaced #6 with a Beru to correct the misfire.

If a scan tool is not available, the best test is to remove the allen screws that secure each coil, engine running, pull each coil out and listen for a change in engine speed/sound. Replace the coil and repeat for the remaining coils to determine the bad coil(s).

This tests both the primary and secondary windings.

[JayG]

Originally Posted by xzl6b1

Had a misfire, that progressively got worse. O'Reilly auto parts used a Bosch scan tool, and found that the #6 coil was bad.

I removed all 6 coils. all coils were within spec (pin 1-3 resistance primary winding).
Replaced #6 with a Beru to correct the misfire.

If a scan tool is not available, the best test is to remove the allen screws that secure each coil, engine running, pull each coil out and listen for a change in engine speed/sound. Replace the coil and repeat for the remaining coils to determine the bad coil(s).

This tests both the primary and secondary windings.

Uh, unless I am missing something, pulling the coil will result in that spark plug not firing