Poss. COP problem
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Post Fiend
Joined: May 2006
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From: Central Florida
Poss. COP problem
I think my problem is a failing COP. It's a random miss, only after longer drives 12+ miles. My normal trips to work and round are only 2-5 miles, so that might be the reason it seems random.
So with no MIL, how can I check my coils? I am going to put an ohm meter on them tomorrow, and any that are out of range, must need replacement. Is there a resistance I am looking for?
So with no MIL, how can I check my coils? I am going to put an ohm meter on them tomorrow, and any that are out of range, must need replacement. Is there a resistance I am looking for?
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Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
Getting a little upset here, I went out today and looked at the coils. Coolant was under the mark, and I just topped it off Friday. It may have been uneven, so it is not that relative. Coils are a little dusty towards the back, but no water, rust or coolant.
So here's the delima. If I do change the coils out, I will do them all. Motorcrafts are middle of the road price wise, I can pick up MSD $50 cheaper. I will check on Granatelli's tomorrow but I expect they will be $50 more than motorcraft, but they will have thier boots. If the granatellis are available and at the price mark I expect, I think I will go ahead with them and do Denso plugs at the same time.
It looks like a pain to get the rear plugs, any suggestions? I need to get it running right by the middle of next month.
So here's the delima. If I do change the coils out, I will do them all. Motorcrafts are middle of the road price wise, I can pick up MSD $50 cheaper. I will check on Granatelli's tomorrow but I expect they will be $50 more than motorcraft, but they will have thier boots. If the granatellis are available and at the price mark I expect, I think I will go ahead with them and do Denso plugs at the same time.
It looks like a pain to get the rear plugs, any suggestions? I need to get it running right by the middle of next month.
Hotshot
Joined: Jan 2004
Posts: 19,763
Likes: 1,081
From: St Louis
You're on a path to spending a lot of money, far more than is required to repair the fault.
Resistance checks will be worthless. If you are indeed experiencing a misfire, the most common reason is an arcing plug boot.
If you're inclined to jump on in and be proactive, I'd recommend that you pick up a set of new Motorcraft plugs ($4 each), a set of plug boots with springs ($5 each), and a BIG tube of dielectric grease. Replace the plugs and the boot kits and use a liberal amount of grease in each boot.
There are several detailed threads with instructions on how to replace the plugs. Locate them and follow their hints.
Steve
Resistance checks will be worthless. If you are indeed experiencing a misfire, the most common reason is an arcing plug boot.
If you're inclined to jump on in and be proactive, I'd recommend that you pick up a set of new Motorcraft plugs ($4 each), a set of plug boots with springs ($5 each), and a BIG tube of dielectric grease. Replace the plugs and the boot kits and use a liberal amount of grease in each boot.
There are several detailed threads with instructions on how to replace the plugs. Locate them and follow their hints.
Steve
Last edited by projectSHO89; Feb 19, 2007 at 07:11 AM.
Cargo Master
Joined: Dec 2006
Posts: 3,489
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From: Central NY
Originally Posted by projectSHO89
a set of plug boots with springs ($5 each), and a BIG tube of dielectric grease. Replace the plugs and the boot kits and use a liberal amount of grease in each boot.
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Post Fiend
Joined: May 2006
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From: Central Florida
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Laughing Gas
Joined: Feb 2003
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From: Bartlett, TN
The part number I am finding online is CP003. It states that it is a Duralast part, but I remember seeing the Wells brand name.
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Post Fiend
Joined: May 2006
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From: Central Florida
I bit the bullet, 8 new motorcraft cops and denso plugs.
One boot/plug was bright orange and pilled full of gunk. It still missed until I plugged my laptop in and remembered that injector #4 was still disconnected. It turned out to be much easier than I expected.
On a side note, the stock platnum plugs are not 100K mile plugs, my 8 came out with 0.060-0.072 gap. More side notes, I torqued one comming out, cyl #5 took 23ft/lbs to remove. I put them all back in (with a health dose of neverseaze) and torqued to 11.2-3 foot pounds.
One boot/plug was bright orange and pilled full of gunk. It still missed until I plugged my laptop in and remembered that injector #4 was still disconnected. It turned out to be much easier than I expected.
On a side note, the stock platnum plugs are not 100K mile plugs, my 8 came out with 0.060-0.072 gap. More side notes, I torqued one comming out, cyl #5 took 23ft/lbs to remove. I put them all back in (with a health dose of neverseaze) and torqued to 11.2-3 foot pounds.
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