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Old 09-01-2010, 12:58 PM   #1
CenARJeepChick's Avatar
Join Date: Jan 2009
Location: Central Arkansas
Posts: 136
Misfire Question

Hi guys, I'd like some input-mainly to validate my own conclusion before I start buying parts.

Last week I was driving home from work-70ish on the interstate and all of a sudden she (2002 Wrangler-4.0l) fell on her nose and started misfiring-vibrating like crazy under throttle and the the check engine light started flashing. I slowed down to about 55 and she was better but obviously still missing. I was meeting my parents for dinner so I checked the codes and pulled a 300 (misfire detected-duh), 301-cylinder #1 misfiring and 304-cylinder #4 misfiring. When I came out of the restaurant I wanted my dad to listen to her. Started up and ran smooth as a kitten purring. I periodically rechecked the codes over the next few days and they were still there but I hadn't felt the engine misfire. So I chocked it up to moisture since I had cleaned up the engine the day before at the car wash.

But its never that easy. Coming to work this morning it misfired a few times. Nothing as severe as the first time but I could feel the occasional stutter on the interstate. I'm thinking coil rail instead of injectors since cylinders #1 and #4 are companion cylinders and share a coil pack. Unfortunately it looks like I have to buy the whole rail instead of just one coil pack. :thumbdown:

So aside from changing the plugs while I've got it apart does anyone have another suggestion or does this sound on target?

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Old 09-01-2010, 01:16 PM   #2
CenARJeepChick's Avatar
Join Date: Jan 2009
Location: Central Arkansas
Posts: 136
Please disregard this posting. I obviously can't tell the difference between and "Y" and a "T" today.
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