Coil pack testing

[Harley92]

Anyone know the best way to test a coil pack ?
Got an 03 tj 4.0 , with a misfire on #1 ,
My problems started when I was on holidays and the clutch gave out .
Shortly after getting it replaced , I got a rough idle ,then camshalf sensor, misfires on multiple cylinders.
Did some checking and found battery cables were loose. Got them tighten up all the misfires but #1 went away , got a cam sensor, checked the position of crank, installed the sensor , that part all works (cam code is gone ) just left with a misfires on #1,
Anyone got any ideas ?

 

[hear]

I don’t know how to test the coil pack (am anxious for somebody to drop some knowledge), but I would at least start by swapping the #1 spark plug with another cylinder to see if it moves.

 

[Harley92]

I don’t know how to test the coil pack (am anxious for somebody to drop some knowledge), but I would at least start by swapping the #1 spark plug with another cylinder to see if it moves.

Have done that , no change

 

[hear]

Have done that , no change

Welp, then it's either not plug related OR the situation is sporadic enough that the offending situation hasn't resurfaced again yet. I have an intermittent P0301 that comes and goes. Diagnostics take forever because I need to wait a random amount of time for it to happen again and see if whatever test I was performing actually told me anything....and if I can even remember what test I was performing after that much time passed.

 

[astjp2]

There was a wiring harness that allows you to use the mini van coils with plug wires, dirt cheap way to do testing.

 

[bucky]

I used the setup below when I was diagnosing my P0303 code.

 

[hear]

I used the setup below when I was diagnosing my P0303 code.

View attachment 541807

I'm confused how that works, what year jeep were you working on?

 

[bucky]

05. Plug it into the coil and ground the fake plug. Plug into coil and connect to plug to test plug. My P0303 code was caused by a failed plug.