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Unread 08-18-2013, 12:29 PM   #1
adhdeej
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Bad Ignition Coil?

After a year of browsing the this splendid forum, under the radar, I decided it's time I finally register. So nice to meet all of you, and I can't wait to learn from some on the best.

Todays issue is... Ignition coil

I decided to test it by pulling the plug and grounding it to the engine block. The spark coming from the cable was orange, I first saw it when the spark transferred to my hand ( great shock to wake me up ). Is this a sure sign of a failing ignition coil, or am I just an amateur with more money to spend than brains to diagnose?

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Unread 08-18-2013, 12:49 PM   #2
LumpyGrits
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No and maybe.........
Why do you think you have a coil issue to begin with?
LG
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Unread 08-18-2013, 12:51 PM   #3
CJ7-Tim
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Coils are tested with a Volts/Ohms Multi-Meter.
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Unread 08-18-2013, 12:53 PM   #4
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Unread 08-18-2013, 01:11 PM   #5
CJ7-Tim
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I can test a 9 volt battery by licking it, why not test a coil by holding on ?
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Unread 08-18-2013, 01:36 PM   #6
LumpyGrits
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Quote:
Originally Posted by CJ7-Tim View Post
I can test a 9 volt battery by licking it, why not test a coil by holding on ?
Most folk only do that once......
LG
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Unread 08-18-2013, 09:28 PM   #7
86cj74.2L
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If you stick a screwdriver in the plug boot and hold the shaft close to a ground is the color still orange with a fully charged battery?

If its orange at 1/4 inch it fails my test. Especially if the primary and secondary resistance readings are close to out of spec.
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Unread 08-19-2013, 03:54 PM   #8
adhdeej
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I went ahead and replaced it anyways, 20 dollars to get the nasty one outta there. Now I have to find out how to get the timing fixed and the dreaded headers to stop leaking.
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Unread 08-19-2013, 04:04 PM   #9
LumpyGrits
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Quote:
Originally Posted by adhdeej View Post
I went ahead and replaced it anyways, 20 dollars to get the nasty one outta there. Now I have to find out how to get the timing fixed and the dreaded headers to stop leaking.
1 Get an FSM and a timing light.
2 Get a wrench/socket on those bolts.
$20.00 for a coil. Where was it made?
LG
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Unread 08-21-2013, 03:12 AM   #10
BagusJeep
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The coil is a simple transformer with two coil windings. All you need is a resistance meter to check the resistance of each.

As to the ignition, a timing light is indeed required but once mastered is straight forward enough. You can also use it to check the vacuum advance and timing curve if you want to get fancy.
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