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Unread 06-17-2013, 07:07 AM   #1
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Join Date: Jun 2013
Location: lexington, ky
Posts: 1
02 Liberty hard to start runs rough

Difficult to start, runs/idles rough until you reach about 55mph. Changed plugs and pulled a few codes said the #1 and #5 are misfiring, after plugs no misfire codes just no imporvement on run/idle.

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Unread 06-17-2013, 05:26 PM   #2
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2005 KJ Liberty 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,366
You put the NGK copper plugs gapped to oe spec on the emission sticker, correct? You may have suffered a coil failure, or multiple coil failure, or possibly injector issues. Either will cause your symptoms. You'll have to drive it some to re-trigger misfire codes, they won't always set in the driveway. See if the misfires are still on the same cylinders. If so, swap the coils for those cylinders to different cylinders, and note where you put them. Clear codes, drive it and see if codes return for misfires where you put the coils. Also, you need to reset the fuel trims after doing a repair like you did, otherwise it may run poorly until it finally relearns.
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