Multiple codes and cyl #4 misfire

[Spazticus]

I suspect my problem is similar to what David Vachon is asking about, but don't want to hijack his thread with my questions. ;-)

About two weeks ago my 2011 Liberty started getting that slight hesitation that only a daily driver would notice, and it's become a misfire on #4 (P0304). I was going to swap coils around this weekend but it got much worse this morning (now P0304 and P2302), so I stopped at NAPA and picked up a new coil for 3 & 4 (the center one). This has had no effect whatsoever, but having a spare coil will be nice.

All plugs and coils were replaced a little over a year ago, for what that's worth. I'll try replacing the the front coil now in case I've misinterpreted the order, but any thoughts would be appreciated.

Thanks!

 

[lfhoward]

Here is the cylinder arrangement and firing order of the 3.7.

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4 & 2 are adjacent to each other on the passengers side, and they’d be using different coils.

 

[Spazticus]

A happy update...

After swapping the coils a couple times I still didn't see much improvement, although the misfire ranged at times from very obvious to subtle at higher speeds. I planned to swap plugs next, so I pulled the wires to see how deep they are set and plan what tools I need. After plugging the wires back in I haven't felt any misfire, and my idiot light went out.

So, before replacing a coil, I should have first just checked that my plug wires were snug. But having a spare coil for the future can't be a bad thing.

Cheers!

 

[lfhoward]

Yay for a happy ending! Nice job.