What engine part is a COP?
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Tuned
Joined: Apr 2012
Posts: 253
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From: Winter, WI
What engine part is a COP?
I see many using the acronym COP and I’m trying to figure out what it is. I did a search for “Ford truck COP and all I found was sites about the 2018 police pursuit Ford truck, at least on the first few pages I mean... what is it? Is there a acronym definition page on this site?
Posting Guru
Joined: Sep 2013
Posts: 1,348
Likes: 6
From: Edmonton, AB
COP = Coil On Plug ( see pic at bottom )
In the old days there were spark plug and distributor caps, the Ford use the Coil On Plug system.
If you watch the video below a guy is changing his spark plugs on his 09 F150 and he shows how you disconnect the COP from the harness it uses, take the bolt holding the cop down removes the cop from the spark plug and then replaces the spark plug and re installs everything
In the old days there were spark plug and distributor caps, the Ford use the Coil On Plug system.
If you watch the video below a guy is changing his spark plugs on his 09 F150 and he shows how you disconnect the COP from the harness it uses, take the bolt holding the cop down removes the cop from the spark plug and then replaces the spark plug and re installs everything
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Tuned
Joined: Apr 2012
Posts: 253
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From: Winter, WI
That’s funny bc that’s what I thought when I saw him blow out the plug holes too! And he’s found rocks in the holes too... a real rock auto! Lol but a good video none the less. I have a ‘03 5.4 that I haven’t done a plug change on yet so when I take it out next spring I’ll have to do that as I don’t know when the last time they were changed. Does anyone know if the COPs weaken over time? And I think I heard that I should stick to factory OEM Motorcraft coils if I ever need to replace them...?
Posting Guru
Joined: Sep 2013
Posts: 1,348
Likes: 6
From: Edmonton, AB
That’s funny bc that’s what I thought when I saw him blow out the plug holes too! And he’s found rocks in the holes too... a real rock auto! Lol but a good video none the less. I have a ‘03 5.4 that I haven’t done a plug change on yet so when I take it out next spring I’ll have to do that as I don’t know when the last time they were changed. Does anyone know if the COPs weaken over time? And I think I heard that I should stick to factory OEM Motorcraft coils if I ever need to replace them...?
Changing before you need to is always a good idea because usually when you need to is when you have a misfire or the truck is running rough. It is really cheap to do and something you can do yourself quite easily.
I have 209k on my F150 I did both cops and plugs took about an hour and half because there were a few beer brakes in there...lol...
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
I have 170K on the OEM coils on our '03 5.4L Exped.
The boot will go before the coil because it has to contain the 10K firing voltage.
I change plugs/boots at 50K using Motorcraft SP479 plugs and Denso 671-0001 boots which run around $60.
Be sure to torque the plugs to 25ft-lbs or so.
Leaving the plugs in for 100K increases the risk of one loosening enough to blow out stripping the threads.
The boot will go before the coil because it has to contain the 10K firing voltage.
I change plugs/boots at 50K using Motorcraft SP479 plugs and Denso 671-0001 boots which run around $60.
Be sure to torque the plugs to 25ft-lbs or so.
Leaving the plugs in for 100K increases the risk of one loosening enough to blow out stripping the threads.
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Tuned
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Cargo Master
Joined: Jan 2007
Posts: 2,243
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From: Roman Forest, TX
That’s funny bc that’s what I thought when I saw him blow out the plug holes too! And he’s found rocks in the holes too... a real rock auto! Lol but a good video none the less. I have a ‘03 5.4 that I haven’t done a plug change on yet so when I take it out next spring I’ll have to do that as I don’t know when the last time they were changed. Does anyone know if the COPs weaken over time? And I think I heard that I should stick to factory OEM Motorcraft coils if I ever need to replace them...?
There are two ways to approach the job. Get the cussin' done early, or get it done later. If you want to get the cussin' done early, start with the two plugs at the back on the passengers side. If you want to wait to do your cussin' at the end, start on the drivers side and work you way over to those plugs.
Other than that, I did not have to remove the fuel rails, but I did have to loosen them and move them out of the way a bit. Not much, and like always, be careful. You screw that up, and you're dead in the water.
It wasn't too bad overall, except for those last two plugs (I started on the drivers side...no one warned me!!).
Good luck, and have fun!
Senior User
Joined: Nov 2017
Posts: 337
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From: Bellville TX.
I have a 2000 SD had a bad cop removed the wrong one. “ through testing” and the tab where it bolts on broke off...
this happened to two of them.....I thought it was strange for someone to replace them for no reason..
not so strange now....
this happened to two of them.....I thought it was strange for someone to replace them for no reason..
not so strange now....
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