Intermittent Misfire...

[CherokeeLiberty]

My jeep started doing this a couple weeks ago. I’d drive to work (30 miles) and it was fine. On my way home, it would start to misfire here and there. It gets progressively worse as I go. Plugs were changed in early January when it was warm. NGK’s were used. The codes that scan out are misfire cylinder 1, and something about the ignition circuit for cylinder 1. It seemed to start shortly after we hit the deep freeze and started getting high temps of -10F or less. Does this sound like a coil pack going bad, or something else?

 

[tommudd]

Switch around the coil packs,
remove the battery cables, attach them together to clear , switch the coils and try it to see what happens

 

[CherokeeLiberty]

Switch around the coil packs,
remove the battery cables, attach them together to clear , switch the coils and try it to see what happens

Thanks, will do on Friday when it’s warmer. How long should I hold the cables together for?

 

[tommudd]

Thanks, will do on Friday when it’s warmer. How long should I hold the cables together for?

1/2 hour or so

 

[CherokeeLiberty]

I haven’t gooten around to swapping coils yet, but here are the codes I get:

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[CherokeeLiberty]

I cleared the computer and swapped coils. My 10 minute drive brought up no codes about misfires. We'll see what comes.

What brand coil is recommended for replacement? I'd bite the bullet and change all six.

 

[MarksmanAkula]

I cleared the computer and swapped coils. My 10 minute drive brought up no codes about misfires. We'll see what comes.

What brand coil is recommended for replacement? I'd bite the bullet and change all six.

Either MOPAR or NGK, same brand as spark plugs. I personally went with NGK from RockAuto.

 

[CherokeeLiberty]

Thanks.

No issues have surfaced yet. It’s been running like a champ.

 

[sleazy rider]

Thanks.

No issues have surfaced yet. It’s been running like a champ.

Gotta love the simple fixes. Just like rebooting a Windows computer.