ignition coils
New User
Joined: Aug 2007
Posts: 5
Likes: 0
I just got my replacement coil. I guess there was some mix up. After contacting them again they replied, since I didn't receive the last one they would send another one right out. The replacement came yesterday.
I put in a set of UneekSupply coils at 106,000 miles. about 4 months ago at 110,000 miles one of them went bad. luckily I kept one of the good original coils so I replaced the bad one. I contacted uneeksupply and they told me they had a life time warranty and to send back the bad one. I did that but still have not received the replacement. I sent them an email in february asking when the replacement was going to be sent. They said it was and they would check to see where it was with the post office. I totally forgot about the coil until today. I still have not received it so I sent another email to them. I will post when get a replacement.
Senior User
Joined: Mar 2004
Posts: 133
Likes: 1
From: North Missouri
I replaced all Ten with the 10/$100 two years ago up. No failures, no problems. Just returned from a 1200 trip each way to and from Texas without a problem. They're cheap enough I can replace all of them again several times and still be ahead money wise.
Fleet Owner
Joined: Aug 2010
Posts: 21,255
Likes: 1,657
From: Reynoldsburg, Ohio
Mountain Pass
Joined: Sep 2002
Posts: 155
Likes: 6
From: Suburban Washington DC
That's great but how can you tell if they perform as good as the Motorcraft coils or other name brands? You might not feel any difference but you may drop a mpg or two or it may not accelerate as fast. And is there a way to test a coil to see if it's working well?
Fleet Owner
Joined: Aug 2010
Posts: 21,255
Likes: 1,657
From: Reynoldsburg, Ohio
Most of us recommending MotorCraft COP's do so from personal experience with the so-called "cheaper" versions. Once we've spent the money and time changing to less quality parts frustration sets in and we're back to using the better brand.
It can be argued they're all the same, made in the same factories etc etc but when one brand seems to be the least problematic over time it says a lot to those who pay attention. There's no huge performance or MPG's gained with so-called higher performance COP's, often times we see reductions in those areas.
I'd much rather buy a $20 COP than the $50-70 typically spent for MotorCraft but because reliability and dependability is most important I'll still buy the good stuff every time.
BTW I'm just now finally replacing a set of Grantelli's that have failed one-at-at-time since they were first installed.
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Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
I have not yet had a "coil" go bad. I've had 2 springs get rusty from a water leak causing misfiring. I've had a coil housing crack at it's weak point where the connector tapers in before the coil casing (really hard to see) causing misfiring. Haven't had any bad boots. But, still haven't had a bad "coil" (transformer) which is the most expensive part.
The COP assembly with the crack at the base of the connector makes me wonder how many fail that way. I'm thinking of running a bead of JB Weld around the base of the connector to strengthen it. The crack went all the way around and the connector could slide out about 1/8", held together by the pins. It only misfired when it was raining. The connector is on the primary (12v) side of the transformer. If it was the secondary (15kv) side it would misfire all the time.
The COP assembly with the crack at the base of the connector makes me wonder how many fail that way. I'm thinking of running a bead of JB Weld around the base of the connector to strengthen it. The crack went all the way around and the connector could slide out about 1/8", held together by the pins. It only misfired when it was raining. The connector is on the primary (12v) side of the transformer. If it was the secondary (15kv) side it would misfire all the time.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
I probably mentioned it a thousand times before, but there used to be a TSB from Ford about coil failures and it mentioned that some huge percentage of coils that were deemed "bad" by techs were not really bad, and it was something else causing the misfire. Boot, spring, corrosion, plug, whatever.
Seems the techs had a knee-jerk reaction to change the COP/boot/spring and the plug whenever they had a misfire. Ford was shelling out big $'s for COPs that weren't bad.
My 2001 V10 is still running with the original COPs. And it's been through some tough high temperatures idling for hours when the ambient temps are in the 90's and I'm running headers.
Seems the techs had a knee-jerk reaction to change the COP/boot/spring and the plug whenever they had a misfire. Ford was shelling out big $'s for COPs that weren't bad.
My 2001 V10 is still running with the original COPs. And it's been through some tough high temperatures idling for hours when the ambient temps are in the 90's and I'm running headers.
Elder User
Joined: Jan 2002
Posts: 780
Likes: 0
Coil failures on a properly maintained vehicle are actually fairly rare. Most coil failures are caused by some external failure or poor maintenance issue such as bad boot, bad plug, etc. My 2000 V10 has 10 original coils and 135,000 miles. My 2005 4.6 V8 has 151,000 miles. It did have one coil failure, but that was caused by a bad plug causing a high resistance which caused a high voltage coil failure.
Coils do not "wear out" like spark plugs do. They should only be replaced when they fail. With the proper equipment they can be positively tested as good or bad. Most coils that are replaced are, in fact, not bad or faulty.
Guessers replace parts. Testers only replace bad parts. It is your money. You can spend it on coils, or beer, or whatever makes you happy.
Coils do not "wear out" like spark plugs do. They should only be replaced when they fail. With the proper equipment they can be positively tested as good or bad. Most coils that are replaced are, in fact, not bad or faulty.
Guessers replace parts. Testers only replace bad parts. It is your money. You can spend it on coils, or beer, or whatever makes you happy.
New User
Joined: Apr 2014
Posts: 16
Likes: 0
Last winter in Florida I purchased 10 Accel coils for my 2000 V-10 6.8 shipped to my address for about $225.00 total. Got them from Summit Racing. This was the best price I could find.
Also just changed my plugs to eliminate a misfire and to ensure all new stuff in the 'spark' area. As noted above, i expect that my problem was more plugs than coils.
Unit runs smooth and powerful.
Will test the plugs/coils on my trip south this fall.
Also just changed my plugs to eliminate a misfire and to ensure all new stuff in the 'spark' area. As noted above, i expect that my problem was more plugs than coils.
Unit runs smooth and powerful.
Will test the plugs/coils on my trip south this fall.
Senior User
Joined: Apr 2011
Posts: 447
Likes: 1
From: Southern Oregon
If you have a buddy at a Ford parts dept......ask for the best price. Got all my Motorcraft coils for 38.00 each. Did it before I took off for full-timing rv'ing just for a precaution. Keep all my old ones.
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