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Unread 01-19-2012, 07:29 AM   #1
NeilBedwin
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1994 YJ Wrangler 
 
Join Date: Aug 2010
Location: Muscat, Oman
Posts: 31
No Spark?

Hi Folks,

So I went off to Dubai yesterday in the Durango and my wife went to work at the Embassy in the Jeep. All worked fine getting there but when she came to go home it won't start!
I popped down to check it today and it turns over, there is a small of fuel but no firing.
I checked for a spark at the coil lead by pushing an allen key into the hole and holding next to a bolt. I got a very weak yellow/blue spark only if I touched the bolt. I get no spark at a plug lead.

Do I need a new coil or am I missing something?

Neil

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Unread 01-19-2012, 07:40 AM   #2
nembudonna
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1990 YJ Wrangler 
 
Join Date: Feb 2011
Location: northwest, ark.
Posts: 903
Check the rotor and cap and the plug wires. If your getting spark in you should get spark out. No matter how strong.
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Unread 01-19-2012, 08:06 AM   #3
NeilBedwin
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1994 YJ Wrangler 
 
Join Date: Aug 2010
Location: Muscat, Oman
Posts: 31
I thought that but the spark has to jump the gap between the rotor arm and the cap connectors does it not?

If it was weak then it would not jump the gap.

Checked the rotor arm and cap and there is nothing obvious. It worked fine to get to work. Wouldn't start 5 hours later.....
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Unread 01-19-2012, 08:10 AM   #4
nembudonna
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1990 YJ Wrangler 
 
Join Date: Feb 2011
Location: northwest, ark.
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What does the cap and rotor look like. Are any of them pitted?
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Unread 01-19-2012, 08:14 AM   #5
NeilBedwin
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1994 YJ Wrangler 
 
Join Date: Aug 2010
Location: Muscat, Oman
Posts: 31
Pitted, but no worse than I have seen on other cars. The lead connectors are fine. Cap has no cracks in.

The Jeep has only done 120,000km or so.

My concern is the lack of large blue spark at the coil lead. Surely it should be big and blue not small and yellow/blue.
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Unread 01-19-2012, 08:15 AM   #6
nembudonna
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1990 YJ Wrangler 
 
Join Date: Feb 2011
Location: northwest, ark.
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You should get a hot crisp spark. You'll be able to hear it and see it. Some people talk about a color but I'am color blind I guess.
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Unread 01-19-2012, 08:18 AM   #7
nembudonna
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1990 YJ Wrangler 
 
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Location: northwest, ark.
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Try scrapeing the tip of the rotor off so it's clean.
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Unread 01-19-2012, 08:27 AM   #8
NeilBedwin
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1994 YJ Wrangler 
 
Join Date: Aug 2010
Location: Muscat, Oman
Posts: 31
Cleaned everything in the distributor - cap, contacts and rotor arm.

I can see the spark and it is small and weak....so it looks like I need a coil.

Parts shops are closed until Sat here but I can get a secondhand one from the scrappers tomorrow. That will prove my problem and then I can order some new bits!

Thanks for being a wall to bounce ideas off

Neil
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Unread 01-19-2012, 08:31 AM   #9
nembudonna
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1990 YJ Wrangler 
 
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Location: northwest, ark.
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Sure hope that's it. Get back and let us know. But it wouldn't hurt to get a new cap and rotor also. But then I don't know what they would cost you. Good Luck.
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Unread 01-21-2012, 01:22 AM   #10
NeilBedwin
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1994 YJ Wrangler 
 
Join Date: Aug 2010
Location: Muscat, Oman
Posts: 31
Toot, toot......that's me blowing my own trumpet

Nipped down to the scrap yard and picked up an ignition coil this morning. 10 mins with the car and it was fitted. First turn of the key and vroom, vroom.

So I am now off to browse Rock Auto and get some new ignition parts! Won't hurt to have a new coil, distributer cap, rotor and spark plug leads.
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