Expedition COP's
 

2005 Expedition
In the last 4 months, I have had 2 COP failures. I have no idea what the failure distribution is on COP's.

Should I go ahead and have the other 6 replaced?

I replace one on my BMW 3 series every six months. I only have one more to go before I have all 6 new ones.

Oh yeah, 150k miles. Plugs properly changed with Motorcraft at 100k.

COP failures on Ford Modular V8s are common. I own 2 Expeditions (one with over 280,000 miles). I'd just replace the one that burned out -- the others may last for quite a long time yet.

Pretty common on ford and chevy trucks. Where do you think we get all our GM coil packs for the Miatas? If one fails, replace all 8.

e90? Just had one fail on mine. I need to do plug in the next ~5000 miles, and if another coil fails I'm replacing all remaining 5. Luckily they're $26 my cost.

dat worldpac lyfe.

E46. Going on 250, 000 miles without more than a radiator and an alternator. And a bunch of coils.

Replace as you go... buy a spare n keep it with ya if you travel far from home... don't wanna burn up a cat from running it too far while misfiring. We get quite a few of ford v8's at work (Firestone) and when someone comes in for their 2nd coil failure, I'll suggest replacement of the rest of them so they don't need to keep coming back for pretty much the same problem, but these are people who can't/won't replace them themselves.

1st two were replaced by my mechanic. I decided to purchase the other 6 for $40-42 each and go ahead and change them myself. All will be Motorcraft.

UPDATE (FINAL, I HOPE)
 

So, I purchased the other (6) COP's and before I had the chance to do the changeout, started getting missing again, including power drops during WOT (not smooth power through RPM range), and flashing CEL.

Thursday, I changed the other COP's and the truck has run fine since (four days).

Cost me $250 for a shop to change out (2) (the front two, no less); and $250 and 2 hours for me to change out the other (6).

I've replaced a total of 9 coils (one has failed twice...) on my 2000 F-150. I used the yellow Accel coils because Summit had all 8 for pretty cheap. But like I said, one of the new Accel coils failed after about 6 months. I've read that Motorcraft coils are much better but haven't tried them...

Coils and exhaust manifolds are really my only complaints about the truck though. It's been in the family since new and never had any significant issues.

One of my old coworkers had a F-150 of the same vintage as yours, he would carry around 2 or 3 spare coils in his glove box. The original set of coils lasted well over 100k, but after the first one went, they all started going out randomly.

Interesting you say that. I've got a 2000 Expedition, and right around 150K I had a rash of coil failures too (I think 3). Ever since then, it's been fine. Truck is at 280K now.

So . . . :dunno:

Did you use Motorcraft coils? That's promising either way.

How many exhaust manifolds have you gone through in that time? I'll never understand why the factory exhaust manifold on my '99 Miata was twice as beefy as the one on my '00 F-150 with a 5.4L V8...

I just used whatever NAPA had. I've never had an exhaust manifold issue, but have had to replace the plastic (?!?) intake manifold due to a crack. Truck frequently tows a horse trailer, so not the easiest duty. It's a 5.4L 4x4.

My grandmother had a Crown Vic with the mod engine. She paid a shop to replace two coils due to a misfire. I think she paid them about $300. The next week she had another misfire. They said they recommended she replace the rest of the coils. I cant stand to replace good parts for no good reason. I had to know which ones were giving her trouble, and only replace those. Her car had 160k miles on it. She insisted we change the rest of the coils so we did, and the problem persisted.

Her misfire was intermittent. Really tough to pin point. What I actually found was a crack in the intake manifold that weeped water onto the drivers front coil area. I guess it only did it at certain times. Every time I checked it was dry, except that one time.... So I added some alumiseal into the coolant. The kind that looks like aluminum shavings. It sealed up in less than an hour and she drove the car for a few thousand more miles with zero misfire problems.

I think I still have a few of the OEM motorcraft coils sitting around. I just could throw away potentially good parts- and now I know they weren't bad at all.