how do i test COP?
Thread Starter
|
Senior User
Joined: Apr 2002
Posts: 201
Likes: 0
From: Schaumburg, IL
how do i test COP?
got a '97 with a 5.4. a while back she started missing going up hills, then would smooth out on level ground. turned out to be a bad COP. well, it's doing it again. i'm not getting a check engine light, so i don't know which one is causing the problem. is there a way to bench test these things?
Elder User
Joined: Feb 2004
Posts: 811
Likes: 0
Not that I'm aware of. The tool makers do make a nifty little tool to check them while running. You hold it in top of the coil and it will light up if the coil works. Only problem is you have to be able to get it to do it standing still. I use a tool from ford to diagnose them.
New User
Joined: Apr 2004
Posts: 14
Likes: 0
I'm not around my Chilton's right now but it has a method of testing. You would have to test them all until you find the right one but if you disconnect the wires and test the resistance across the two leads a functional COP should have a certain resistance. (4-10 ohms if I remember right) Also, the only COP I had fail physically changed color to a brown almost brittle look so you might, possibly be able to see a difference with a good flashlight.
Freshman User
Joined: May 2004
Posts: 25
Likes: 0
Trending Topics
Thread Starter
|
Senior User
Joined: Apr 2002
Posts: 201
Likes: 0
From: Schaumburg, IL
my FORMER mechanic replaced the COP last time, so i didn't see the plug. w-a-y too long a story to explain why he's my former mechanic. i keep reading here that it's not as hard as it looks to get them out, so i thought i'd give it a shot. just don't know what to do with em once i get em out.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Freshman User
Joined: May 2004
Posts: 25
Likes: 0
The COP is held down with a bolt, 7mm socket. You want to look inside of the boot to see if there is a line. Looks like a pencil line. Also check for cracks or holes in boot, damaged connection(on harness and COP). Hope this helps.
Thread
Thread Starter
Forum
Replies
Last Post
rat49f6
1999 - 2003 7.3L Power Stroke Diesel
17
May 31, 2009 02:09 AM
jdhudall
1997 - 2003 F150
15
Mar 21, 2009 07:27 AM
