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Unread 03-25-2012, 06:43 PM   #1
bluedaffy
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1989 YJ Wrangler 
 
Join Date: Oct 2011
Location: Stevens Point, Wisconsin
Posts: 286
No spark to one wire. Please help.

So I did something pretty embarrassing, I pulled a spark plug wire to take out the plug and check its condition. I looked at the plug, put it back into its home but forgot to put the spark wire back on it... Then I started it, I immediately could hear the snapping/sparking of the wire and turned the jeep off. Now for some reason it isn't sparking... What could have caused this? All the others seem to be sparking fine, just the one that I left off for a moment. If it was hanging down and grounded to some metal would that cause it to not work? My first thought was a blown fuse but there aren't separate fuses for each plug wire is there?

I use this jeep daily, I sure hope someone can help to explain to me what could have caused this wire to stop working.

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Unread 03-25-2012, 06:51 PM   #2
Old4X
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1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
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The high voltage coil discharge WILL find a path to ground. Usually this is the gap at the end of the spark plug. If the wire is left off, the next closest path will come into play. Could have been a crack or weak spot in the wire, then it burned through and left a carbon trace (just like a crack in a distributor cap).

Just replace the wire and see if that was your problem. Could have nailed the distributor cap, though, so that would be the next place to check if new wire doesn't fix your problem.
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Unread 03-25-2012, 06:58 PM   #3
bluedaffy
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1989 YJ Wrangler 
 
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Thanks for the quick response. If it had by chance nailed the distributor cap wouldn't the other cylinders not be firing as well?
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Unread 03-25-2012, 07:50 PM   #4
Old4X
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Quote:
Originally Posted by bluedaffy View Post
Thanks for the quick response. If it had by chance nailed the distributor cap wouldn't the other cylinders not be firing as well?

No. You could have burned a trace in the cap from the dead post to the next closest ground (could be another post, or the distributor housing itself). Once the path is established, you have a carbon trace, and the spark energy follows that.

Probably just the wire, though.
Your wires aren't really wire, they are a carbon embedded thread-like material. They are fragile, and can be pulled apart by tugging on them, also they crack with age.
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Unread 03-25-2012, 08:19 PM   #5
mcmud
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1983 CJ8 
 
Join Date: May 2008
Location: N.E. Alabama
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While the points made by Old4X are worthy of attention this may just as well be a case of a "wet fouled" spark plug.
Irregardless of how soon you shut the engine down that plug was saturated with fuel, and still is if you have a miss.
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Unread 04-01-2012, 07:49 PM   #6
bluedaffy
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1989 YJ Wrangler 
 
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it was just the one wire that needed replacing, thanks all.
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