Random Missfire - JeepForum.com
 
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post #1 of 6 Old 09-24-2009, 06:07 PM Thread Starter
lothar863
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1996 ZJ 
 
Join Date: Oct 2007
Location: Nashville
Posts: 46
Random Missfire

So I was driving home the other night and all of the sudden the jeep started running rough.

Got out and checked it and the #4 spark plug was just gone. Completely. Wire was hanging from the distributor. Nuresed it the last couple blocks home and went and got a replacement. Put it in and it is better but I am now getting a stuttering. Had advanced auto pull the codes and got
12
43 Missfire #4 (guessing from when plug was gone)
43 Random Missfire

any ideas on random misfire?

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post #2 of 6 Old 09-24-2009, 06:36 PM
Virmagicus
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Location: Northern Indiana
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Unplug the negative on the battery. Turn the ignition on. If the problem persists try new plugs and dist cap.
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post #3 of 6 Old 09-24-2009, 06:46 PM
dougy147
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2007 JK Wrangler 
 
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Posts: 652
So you're saying the plug was completely gone....nothing in the spark plug hole? I would be most concerned with how that came to be if that's the case!

Other than that x2 on tune up - plugs/wires/cap/rotor.

The Past
95 ZJ Laredo 4.0
00 WJ Laredo 4.0 & 4.7
08 WK Laredo 4.7 (traded for tin can)
The Present
07 JK Unlimited Sahara
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post #4 of 6 Old 09-24-2009, 07:01 PM Thread Starter
lothar863
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1996 ZJ 
 
Join Date: Oct 2007
Location: Nashville
Posts: 46
yeah nothing in the head at all plug was just gone. all the others were nice and snug. plugs have been in about year.
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post #5 of 6 Old 09-24-2009, 07:30 PM
dougy147
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2007 JK Wrangler 
 
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Posts: 652
Wow, that's kinda wild. The new one is holding tight? I would really check those threads out! I'd guess the wire that was attached to that plug when it got launched out of the head probably has a break in the wire internally. I'd start with wires.

The Past
95 ZJ Laredo 4.0
00 WJ Laredo 4.0 & 4.7
08 WK Laredo 4.7 (traded for tin can)
The Present
07 JK Unlimited Sahara
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post #6 of 6 Old 09-24-2009, 08:11 PM Thread Starter
lothar863
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1996 ZJ 
 
Join Date: Oct 2007
Location: Nashville
Posts: 46
i have the negative disconnected right now and letting it sit. i will have to wait until i get paid to do wires. just got back from vacation but it was really wild took me a second to grasp what exactly had happened and that it was just gone.
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