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Old 10-18-2007, 05:39 PM   #1
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Default How to test Ford Coil on Plug Packs

with an Ohm meter and the coil on plug pack out of the truck...

Check the Primary circuit by simply taking the pos test lead and attach/touch it to one connector terminal and at same time attach/touch the neg test lead to the other. Measure the ohms and ensure you are seeing at most 5.5k Ohms


Also check the secondary circuit of the Coil on plug pack by touching the pos lead to one of the primary pins and the neg lead to the spring in the boot of the pack. Measure the ohms and ensure that .5500 Ohms.

Primary 5.500 k-ohms
secondary .55 ohm

this will work is the CP is dead....not one that is intermittent or starts acting up after it gets heated up or failing under load. FOrd makes a nice diagnostic tool that can diagnose problems like this.
Attached Images
File Type: gif cop.gif (4.3 KB, 837 views)
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Old 01-17-2011, 07:09 PM   #2
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And what is said diagnostic tool?
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Old 01-17-2011, 07:30 PM   #3
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bout a 5k diagnostics tool (Ford IDS)
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Old 01-17-2011, 07:35 PM   #4
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Nice write up! Thanks Stew!!!
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Old 01-17-2011, 07:39 PM   #5
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Quote:
Originally Posted by Bgstew6 View Post
bout a 5k diagnostics tool (Ford IDS)


Lol so if I have an intermittant problem with one I cant find its cheaper to just buy a whole new set
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Old 01-17-2011, 07:40 PM   #6
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Quote:
Originally Posted by costrsupt View Post
Lol so if I have an intermittant problem with one I cant find its cheaper to just buy a whole new set
or if you have a buddy at Ford he can hook it up and run and iNdividual cylinder performance test
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What's that sound you say????...."Why that's 19lbs of Pure, Cogged, Kenne Bell 2.3 Screamin Hell! mixed with a little bit of my Stock Block crying like a Jilted Jezebel
"If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle."
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How come these injuns ain't killin us???
Cause they can't see us, we're in the spirit world asshole!!!

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Old 01-18-2011, 03:59 AM   #7
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As someone once told me recentely here after trying to explaining something to them...
Now I'm really lost.
What happened to the day when 1 freakin coil fires All the freakin plugs? 8's and high 7's were attained like that.
Sorry, I am from the keep it simple stupid school.
Thanks Stew L veteren, one day I am going to need this info but for now I will stick with my stock cop's and cross my fingers and toes. Some stuff is over my head but it is a good read.
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Old 01-18-2011, 10:26 AM   #8
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each coil is fired just after injector fires . reason most people change all
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Old 01-18-2011, 10:42 AM   #9
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because if one is failing why do 1 at time . unless new. just change all
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Old 02-06-2011, 03:02 PM   #10
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In my experience I had 2 COPs fail in my 2000 F150 at once. No reason to replace perfectly good COPs. That'll be like replacing all 4 tires if you get a flat.
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