Misfire on 2003 TJ

[Paul Robbins]

Code comes up for misfire plug#6.
What’s the best route to go? Change all out or just the one? Best replacement coils? I’ve got 160+ miles..


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[Chris]

Change out all the plugs for the Autolite XP985 plugs.

Use OE Mopar coil pack replacements.

 

[Paul Robbins]

Change out all the plugs for the Autolite XP985 plugs.

Use OE Mopar coil pack replacements.

What about wires? My Autozone in town only offers Delphi or Duralast coil packs

 

[Chris]

What about wires? My Autozone in town only offers Delphi or Duralast coil packs

Wires? There shouldn't be spark plug wires. If it's coil packs, there are no spark plug wires.

I wouldn't use any Autozone brand parts ever... 9 out of 10 times, they'll just cause check engine lights on our TJs, which are notorious for rejecting aftermarket sensors other than OE Mopar.

You can certainly try them though. Just make sure you save the box and the receipt, because if for some reason they cause a CEL, that will be the reason.

 

[Jerry Bransford]

No need to replace the coil pack yet, and if you get to that point avoid using Autozone's Duralast store brand. Chris's Autolite XP-985 plug was a great suggestion. Newer 4.0L engines with the coil pack ignition are fussy about the type of spark plugs it will run well on. It will miss and backfire with single-tipped platinum spark plugs like the Autolite AP-985 or Champion 3034.

 

[CodaMan]

Why throw parts at it, troubleshoot it.

https://wranglertjforum.com/threads...the-dreaded-misfire-and-how-i-solved-it.4212/