I have watched so many videos on testing coils, if only I found your video first. No crap, no music, no sponsors just you explaining how to test coils. Thank you

Great video. Straight to the point/ No fluff and showed the spark side testing. Hats off to you.

I really liked that. usually we see people testing just at the plug terminal, not inside the coil as you did. great job!

Thank you, you are the only person that was very direct and gave information without me having to wonder what I was looking for. I have a Jeep instead of a ford, but I get it. Thank You so much. God Bless.

As stated in another comment, you could replace just the boot and spring. Another common problem is the boots cracking and the spring shorting to the block. Which is why they are supposed to be replaced when you change your plugs. You can buy eight boots/springs for the price of 1 coil. Thanks for the vid showing this.

No kidding. No nonsense help. Thanks from Alberta. Mine read .5 ohms on the primary side. Make sure your meter is set to x1000 for checking the secondary side.

Cut and dried! No bull! I love it. Thank you!

This helped out a lot! Didn't even think about testing the continuity to the spark plug side of the coil. Thanks for taking the time to put this up.

Finally someone knows how to get the point and not give a huge line of bologna

Thanks William , I appreciate your help. I feel better about this part of my search to figure out whats going on with my 4.6 and what Ryan Roy says below as well.

This really helped! Thank you for taking the time to make this video.

THANK YOU for this video, I have been following advice of several people and testing many different things. Started suspecting the worst as she may have run low on oil. Tonight at the advice of a mechanic friend I checked the coil's like I saw in another video and they all came back good, damn another thing it isn't. Until I read the top comment saying that was the wrong way to do it. I came to your video and did it your way and just found one that's bad!!!! Thank You! Now I can do a super charger instead of a rebuild cause I know she's got good compression.

Thank you for sharing your findings. Always appreciate the time ppl take to do that especially with the detail. Really does help if you're troubleshooting. Take care sir.

Thanks man all the way from Saudi Arabia. This is a very accurate simple way to pin point the problem.

This is exactly how I test them, forwards and backwards, and keep track of the numbers. I'm dealing with a misfire in the 8th cylinder, E150 van, I just dropped it off at a local mechanic to give me a price to fix it, but if it's too much, I'm just gonna do it myself, vans are just a pain in the ass to work on and I'd much rather pay someone instead of me out here busting my knuckles in the cold, in waiting for the call with that number, that's why I'm watching videos on this stuff right now, if this dude says "$1,000" to change the plugs and coils in my van, fuck that I'll do it myself. Good video brother, not too many people know you can check the resistance on coils using the method you just showed👍👍

Thanks for the information William . It was very helpful .

You can pull that boot off and pull the Spring and there is a little metal clip the spring hooks to. if you clean that Connection then put the Spring back on you probly get back to 5.1oms the coil its self is good it's just get a bad connection at the Spring

Awesome video. Just help me alot here. I tested them on the one side . Never thought of looking/test both ends . Makes total sense. 👍👍

Dear William, What this video needed was you thanking your sponsor at the start for almost as long as the actual video, loud annoying music over the top making your voice almost impossible to hear, then you advertising your PayPal/Patreon at the end for just as long as you thanking your sponsor at the start, therefore actual program content is no more than third of actual video length!! (Sarcasm). Cheers mate, this was like the Old KZfaq, where you could click and solve a problem. Thank you and best wishes from an Englishman in a French forest. 🏆

There is actually 2 pieces. The coil and sparkplug boot. The two are connected together by a spring clip. Separate the two and you may find that the connection is separated by corrosion, rust , most of the time it will be pitted by sparks jumping that connection and then finally not being able to jump across. Easy to separate and clean with an Emery board or fine sandpaper. When a shop test a coil pack it always in one piece and the bad one will fail, but and if they (they won't) separate the two , most of the time the coil pack will pass. These coil packs are pretty solid , it the connection that's not, it moves through vibration and temperature changes. All it takes is one spark jump to start the process of failing that will just get worst . Nice video on how to check. But try this and it could be a permanent solution for the do it yourselfers...

I like the video keep up the good work I am an electrician and you can check the coils that way Cattails that the coil is burnt up

Trail gear is the name of coils i put on my truck. Got them on Amazon for $37.99 been on my truck for on year and haven't ho any problems with them .. the first one was Accel.. lasted about three months. At $230.00 ..the cheep one i recommend..

Yes, very excellent right to the point, no wind , no shaken camera, no bla bla bla about the Red Sox 👍

5 years later and still relevant to today. Thanks 2 bad coils here ohmed good on the primary side and nothing on the spark side.

Thanks for the help! Can't afford to go to a mechanic this month.

Sir you are a blessing. Your video is and was the exact information that I needed. Nice to know that there is someone who actually made a pretty much self explanatory video. You extremely helped a simple old country boy from Tennessee. Yall be good. God bless you and your family.

Following your method as we speak. Thank you sir

Great video! It definitely helped me out. Thank you for keeping it simple.

awesome my truck check engine just start to blinking i never knew to check the spark plug side til this video thanks

Simple str8 to the point no bs.... Good video man

Thank you for getting straight to it. I’ve watched a dozen videos this morning where they’d tell the viewer the whole history of spark ignition, how a COP worked, and assorted yammering. I just wanted to know what values on the multi meter meant a coil was good or bad. Thanks again.

Great video William. I had a few cylinders misfiring. This solved it

Excellent video. Truly appreciate your taking the time. Helped me allot.

Very informative. Thanks for the video.

I just went ahead and changed all mine to have all new ones. Now i don't need to worry about them failing. I'm about to change all my injectors as well.

Nice one buddy. I've got a coil playing up, I'll try this as well.😊

Most vids do not test resistance on the spark plug end. Good tip. I used this technique at LKQ to test some coils from a wreck with 159k miles. I got similar readings so I bought a couple of them at $18 each. They were Motorcraft OEM. Did the swap and the cylinder is back to normal. On a side note, I tested the bad coil and it returned stable reading at the coil end of 5.85 Ohm. This was higher than any of the others. Reading did not jump around like the bad coil in the vid. I suspect mine has a thermal related fault that causes it to loose spark at operating temperature. It fires fine when cold but starts to miss after a few miles.

Thanks brother . Right to the point.

Thanks man, straight to the point

Thank you very much for showing that to us!

The old 2 valve 5.4! I still have mine at 290000 miles

Huge help. Thank you!

Thanks for the video I’m hoping to apply your method today. I’m getting ready to replace my coils for the 5th time in 13 months. It won’t stop running like shit when it wants to. One day it’s fine the next it’s bucking and missing so bad you think the motor is gonna come loose from the motor mounts and 5 seconds later it’s running like a new truck. Also I’ll add sometimes it will throw a code and check engine light will come on other times it won’t. I’ve used $600 motorcraft coils $300 AutoZone coils $250 roc auto coils 3 different cheap brands from Amazon only to find the motorcraft VS Amazon $40 per set coils all run the same way and that’s pretty sad. Also will add plugs have been changed 3 times now all plugs have been motorcraft brand. And each time it’s a cylinder misfire code it’s usually the same cylinders doing so. I can pull the bad code - misfire coil and move to another cylinder and sometimes the misfire moves with the coil and other times it doesn’t follow the coil. Not sure how a coil can misfire in cylinder 5 but be fine in cylinder 6 etc. I’ve even went as far as replacement of all coil pigtail clips thinking it was a wiring problem no such luck. ANYONE have a clue what’s wrong here I’d greatly appreciate any advice. Oh sorry forgot to add my current set is the yellow set you appear to be using right now.

I was having this problem this morning...i thought I was going to be all day...until I saw your straight forward and two the point video... Thanks SOOO Much. Mike D. In Houston TX

Good info, thanks for sharing!

thank ya man it`s simple and perfect

The bottom to top test shows you if it's shorting to ground on the secondary coil wire. ▪︎ Primary coil: the top connector is supposed to be 1.0Ω or less ▪︎ Secondary coil: Top to bottom is supposed to read between: 5.5-8KΩ (2pin, 2 wire types) 12-15KΩ (waste type)

Thankyou great video very educational

mine is same as you f150 5.4ltr- my primary readings vary on my new coils they are 1.0ish and secondary range between 5.60 and 5.72 are these numbers too high? but my old ones are consistently, primary 1.0ish and secondary's are 5.44 they are all the same

Awesome video sir, thank you!!

Unfortunately, coils with perfect resistance measurements can be bad too. The best way to check is with a spark gap tester. The coil is only good if it can produce a spark that jumps a 30 KV gap in the tester. Three of my coils with perfect resistance measures were not able to produce a spark that jumped 10 KV while the other three jumped 30 KV. Resistance measurements were identical on all of them. I measured primary coil, secondary coil and resistance from primary coil to ground. Do not put the coils back in unless you test the with spark gap tester.

STRAIGHT, DIRECT INFORMATION! INSTANT SUB! TYSVM!!

Every mechanic should have your accent!!

You hot straight to the point, Thanks A lot. you seem from Kevin skinner's Hometown 🌱😊

i have a stupid question , does the retaining bolt flange that holds the coil to the block have any ground , mine i cant tighten , the bolt holding it down is stripped , used truck , and i notice it knocks every so often , c 5 misfire

Great video thnks bud👍

Great video, Thanks

Very helpful. Thank you.

Great bare bones video, thx

Does anyone think I mighty as well replace all coils and plugs even if I can successfully diagnose one? Since im down there I hear its a pain to get to. misfire cyl 7

Real nice...I like the video. "To the point"...ahm ownna giver a try.

I'm having a bit of trouble. I can only get a reading on the top terminals, If I use 200 0hms. (3.3)...Then if I switch to 2000 K, then I can get a reading from the terminal to spring at (5.4). Been screwing forever with it! It's minus 22 and just had a storm blow thru. Any help would be nice. 🇨🇦

Great info, thanks

Glad to help..

that s a big help. thanks

Big help. Thanks.

I cant seem to get the coil to snap on back on the spark plug. I put it in but they wont snap snuggly on the plug like the 2 new ones do. Why?

When setting the meter do you turn the knob to 2000k 200k 20K mm or 200 that would be the first thing to say in the video

Coals?

Could you please tell me What’s the settings you’re using for the meter

Great video

Good luck getting those Accel coil packs back off if one goes bad. They Definitely don't just pop off easy like the OEM motorcrafts do. They pull apart before they come off the plug.

When ohm from the spark plug end to the connector these 2 pins dies it matter which one you put the lead on?

Thanks, man.

Aight bro mine gave on the multimeter one 10.6 four 6.5 and the other 3, 5.6 whats the right range...is a v8 for f150 2001, i do not have power going up hills..

Yes, it did help

Thanks friend

But coils are weird. I know coils might show good. Until they get hot . Good point.👍

Thanks William!

Hi William, I'm having trouble with my 98 F150, scanners aren't showing anything but it's running rough like it has before when a coild has gone bad. Local ford dealership won't even scan it, they say it's too old, got coils,plugs, scanner+ other stuff coming, might need your help. Been subscribed since back when I had another miss in the engine.

From terminals mine are Ohm at 1.3 consistently but from terminal to plug I’m not getting anything

Me and my boyfriend have the same truck and model, he just changed the sparks plug and the plug wires but one of the wires keeps popping out when you go down the road and then it starts missing and shaking. We have tried all the things we. Can think of and also what we have looked up. So what can we do to .stop it from popping off ? Please help

I have toyota 4 pin coils. They show different. Three pins on top show ohm values. But pin to boot shows 0 values on new coil. Bad coil will show values on 3 pins to boot.

Thanks!!

Thank you Sir.

Thank you sir

The set of $67 ones I got for replacement for 2001 5.4L Excursion, all 8 read as follows: Primary: 0.4 ohms Secondary: 5,900 to 5,990 ohms.

Thanks

5.52 K ohms or M ohms on the spark side??

What was the bad coil causing for a symptom of the bad coil? Mine hesitates at like 70mph like it’s losing a cylinder or something I’m guessing it’s probably a coil. Well I’m hoping it’s something that easy lol

that did fix the misfire motor runs good

When he did the spark side, he should've tested without the old spring contact. It was probably bad, causing the low reading. The coil could still b good.

Gotta take a the boot off to get a reliable reading of the coil

Thanks for the video, I got a cheap ohmmeter at harbor freight for $6 and tested all my old coils, 7 of the 8 read 5.61 and 5.51, only one read 5.45 which I think is still fine, I'll test the newer ones on the truck and see if they are within the same range. Truck has been misfiring under load at 45mph-60mph and I already changed the plugs and coils with no success.

Thanks.

What is your tester set to? Thanks.

Bouncing readings on coil = BAD thank you!!!

Where you get your coils? The yellow ones that are un your video.

Have u ever had just 1 coil read 1k higher than the rest? How bad is that or is it not so bad

The test leads are horrible...Lol... I subscribe and am saving this into my ASE A8 Folder 📂 😎