lifespan for ignition coils

mostsmooth · Jan 31, 2021

we are supposed to replace spark plugs every so often, don't know offhand what that interval is, but let's say it 50k miles. we do this because their performance begins to fade I assume?
so, is the same true for the ignition coil?

also, I attached a pic of the post of my coil. seems really beat up, not sure how that happens? is it just from being 25+ years old and 145k+miles? doesn't seem like just the age would make it look like that, and really, 17 of those 25 years the car wasn't being driven. it couldn't be from arcing inside the boot, could it?

I tried to do a search related to coils to see what's been discussed, but I kept getting a server error, sorry.

thanks

7991LXnSHO · Jan 31, 2021

I’d 1. Clean the terminals. 2. Get a new coil wire and boot. 3. Install it with dielectric grease. 4. Ease on down the road.

revhead347 · Jan 31, 2021

+1. Ignition coils are a change when fail part, like alternators and starters. Clean it up, and keep going.

Kurt

Adieu · Jan 31, 2021

Ignition coils don't have a scheduled interval for replacement. They fail when they fail, and that's when you should replace them.

mostsmooth · Feb 1, 2021

thanks all,

just so I'm clear on what 'fail' means, there's no grey area? it is either working 100% or 0%?
if that's not the case, is there some type of test that can be performed to check the current operation?

also, for future reference, if ever it does need to get replaced, is a stock ford coil the way to go, or are there better alternatives?

thanks again

7991LXnSHO · Feb 1, 2021

You can check the resistance of the primary and secondary coils. I do not know the specs for these because if it’s significantly off, the car will also be off or misfiring.

Adieu · Feb 1, 2021

mostsmooth said:
thanks all,

just so I'm clear on what 'fail' means, there's no grey area? it is either working 100% or 0%?
if that's not the case, is there some type of test that can be performed to check the current operation?

also, for future reference, if ever it does need to get replaced, is a stock ford coil the way to go, or are there better alternatives?

thanks again

Correct, it either works or doesn't.

Most coils can be tested if you can find the specs, they used to be in the back of the GP Sorensen paper catalog back in my parts counter monkey days, but try finding a store that still carries GP Sorensen and/or still has paper catalogs with all the goodies hidden within.

Stock Ford (Motorcraft) is the way to go until you get into serious modifications.

jozsefsz · Feb 1, 2021

I'll mildly disagree on works-or-doesn't. If it's leaking electrolyte it can just perform poorly. That is very unlikely with a stock coil. Very likely with MSD or equivalent Chinese crap.

mikestang63 · Feb 1, 2021

30 plus years and mine work fine

7991LXnSHO · Feb 1, 2021

jozsefsz said:
I'll mildly disagree on works-or-doesn't. If it's leaking electrolyte it can just perform poorly. That is very unlikely with a stock coil. Very likely with MSD or equivalent Chinese crap.

Electrolyte is in capacitors. The wire windings need insulation, not a conducting medium.
This style of coil has epoxy, and the can style is oil filled. If the epoxy goes on an MSD Fox coil, it buzzes. (The replacement does not do this.)

Mustang5L5 · Feb 1, 2021

I have an oem original coil in my car. Still kicking. Looks much better than yours OP however.

I disagree on the works or doesn’t part though. I had an aftermarket accel coil and the car would break up over 3000RPM. I replaced the coil and that problem went away.

mostsmooth · Feb 1, 2021

thanks all,
seems there are some degrees of 'fail' not just working or not working, but I don't know that I'm going to go through with trying to figure out how to do any special testing.
I thought I saw in a youtube vid some type of thing you just hook up to the coil and see how strong the spark is or something, but if you guys never heard of it, maybe it's car specific or something.

thanks again!

nickyb · Feb 1, 2021

Ok most, coil is cheap enough to replace with motorcraft one and shelf the origanal,this way you'll have a working spare.

General karthief · Feb 1, 2021

Open the hood on a high humidity night, look for spark tracing on the body and around the coil wire tower. See nothing, do nothing.

jozsefsz · Feb 4, 2021

7991LXnSHO said:
Electrolyte is in capacitors. The wire windings need insulation, not a conducting medium.
This style of coil has epoxy, and the can style is oil filled. If the epoxy goes on an MSD Fox coil, it buzzes. (The replacement does not do this.)

You're correct that's it's not electrolyte, but on subsequent research I was correct that the MSD TFI coil is oil-filled. I didn't think it was my imagination that it leaked a bunch of yellow oily crap out onto the mount and started missing at boost. Short story MSD is crap in shiny red.

Adieu · Feb 4, 2021

jozsefsz said:
Short story MSD is crap in shiny red.

Amen. If you think their coils are bad, you should try their EFI system sometime...

mostsmooth · Feb 4, 2021

MustangIIMatt said:
Amen. If you think their coils are bad, you should try their EFI system sometime...

Do they make anything good?

mikestang63 · Feb 4, 2021

their old stuff is great. when they started offshoring the quality went to crap

Adieu · Feb 4, 2021

mostsmooth said:
Do they make anything good?

Apparently the MSD Mod-6 isn't bad, but I didn't take any chances and bought an EDIS-8 off a '91 Town Car in the junkyard instead. If the used 30-year-old EDIS-8 fails, it was $20 and there's at least 100 more out there in that same yard.

mostsmooth · Feb 4, 2021

i have an MSD dist cap and rotor (had not options at the time), should i just throw it in the garbage?
hopefully their spark plug wire is ok?!

lifespan for ignition coils

mostsmooth

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7991LXnSHO

wanna catch the space herp

revhead347

Apparently my ex-husband made that mistake.

Adieu

Easy there, this ain't a dating site.

mostsmooth

Active Member

7991LXnSHO

wanna catch the space herp

Adieu

Easy there, this ain't a dating site.

jozsefsz

mikestang63

7991LXnSHO

wanna catch the space herp

Mustang5L5

That is…until I whipped out my Bissell

mostsmooth

Active Member

nickyb

I gotta say i never painted my nuts, Never Ever

General karthief

wonder how much it would cost to ship you a pair

jozsefsz

Adieu

Easy there, this ain't a dating site.

mostsmooth

Active Member

mikestang63

Adieu

Easy there, this ain't a dating site.

mostsmooth

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lifespan for ignition coils

Active Member

Attachments

wanna catch the space herp

Apparently my ex-husband made that mistake.

Easy there, this ain't a dating site.

Active Member

wanna catch the space herp

Easy there, this ain't a dating site.

wanna catch the space herp

That is…until I whipped out my Bissell

Active Member

I gotta say i never painted my nuts, Never Ever

wonder how much it would cost to ship you a pair

Easy there, this ain't a dating site.

Active Member

Easy there, this ain't a dating site.

Active Member

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