Fried Coil Rail

[Madman]

So, I was on my way to work CEL flashes and stays on and my jeep starts running like crap. Power dropped off like it was a missfire. Pulled over and checked under the hood to find nothing obvious. I restarted it and drove down the road to see what the codes were at a Napa. 300,303 and 203. I replaced the plugs as it was time anyways. 95% increase in power. Still something was not right. After a bunch of reading here and other places I replaced the coil rail and all seemed to be fine for about three weeks. Then more error codes (300) and once it threw a (304) witch was new. So I checked the injectors with my meter once when the engine was hot and once cold. I do believe the #3 injector is bad... I just had too many different readings, sitting outside this mornin i redid it and it was 12.7. However I have found a hole in the coil pack. So it the last three weeks it seems that the new part is no longer functioning. I have a new one on the way.

Questions..
I drove it this way more than i wanted to. How do I tell if the CC is bad now?
Ideas on the coil arcing enough to blow a hole in it?
If the new coil rail stops the problem this time I feel it will just happen again..
Insights Please
Thanks,
Chris

 

[Jerry Bransford]

Store brand coil pack? If so that wouldn't surprise me.

 

[Madman]

Yep! I was in a bind. Just installed the new one and new Champ plugs. Took off great. 3 min driving and.... back to the same problem. just do not have the money to take it to a shop ATM. What would I look at next?
PCM?
Thanks
Chris

 

[AjRagno]

Check the wiring harness back to the PCM for chafing and also make sure the ground is clean. It should ground to the stud on the passenger side of the engine block.

I bought a Hitachi coil rail for my ‘05 a few weeks ago. Rock Auto lists it as the OE part, $70 less than Mopar.

 

[Madman]

P2302 is now showing up as the only code. gonna check the harness for problems.