How to test an ignition coil, Diagnose a bad ignition coil. Ignition coil with multimeter, Misfire

[@edgarq-yo1zh]

So many videos about ignition coil diagnosing, some use devices that are expensive and i will not use again until another coil goes bad. But this video went straight to the point, helped find out the bad coil in a few minutes and got my car back to purring like a baby, thank you so much.

[@picklefoot]

Thanks bro. I'm super glad you tested a new one

[@DCTrainsOfThought]

Great video. Just tested coils in 5 min and found the one I suspected was causing issues due to a old valve cover gasket issue and it sitting in oil for an extended period of time at some point. Now I'll grab 1 coil instead a whole set for no reason. Thanks!!

[@octaviojabali6981]

Thank you best video on how to check coil simple and straight to the point

[@TheDIYDoc]

@@octaviojabali6981 I still prefer redneck method just swap it to another cylinder if your miss moves it’s diagnosed.

[@octaviojabali6981]

@@TheDIYDoc thank you just so your viewers know i hove a dodge promaster the boot sometimes breaks so what I do is replace the head of coil it separates and there is a long spring i elongated it and it works without removing the stuck boot that is if you’re not replacing spark plug 👍

[@TileMarbleGranite-u8d]

Amazing tutorial! I am measuring the ignition coils to my truck, Primary should read 0.6 - 0.9 Ohms. Multimeter set on 200, the readings I am getting are; Coil one 02.5; Coil three 01.9; Coil five 01.6; Coil seven 01.8; Coil two 02.6; Coil four 02.3; Coil six03.8; Coil eight 03.6. When I set the multimeter on 200 on the screen it shows 1. Do I extract the 1 out of the readings?

[@TheDIYDoc]

Make sure yall follow. Page is fairly new but I’m posting often!

[@TheDIYDoc]

Hmmmm are you sure they’re supposed to be 0.6-0.9? And no you don’t subtract 1. Higher the resistance the older the coil and the less voltage it will produce. High resistance is bad for voltage flow.

[@chipsisshook1741]

I just tested my motorcycle one, the range is supposed to be 1.6 to 1.8 ohms and I got 2.5. Does this mean it’s bad?

[@TheDIYDoc]

No. That’s small range. If it runs it’s fine. I wouldn’t even check em unless you’re having a miss. Mild increase in resistance isn’t an indicator it’s bad

[@chipsisshook1741]

@@TheDIYDoc i have a misfire in one of the cylinders. What else should I check

[@TheDIYDoc]

@@chipsisshook1741 check spark plug. Ignition coil. Compression. It’s one of those things long as getting gas to it. What was ohms on other coil? Similar or different.

[@TheDIYDoc]

If other coil is 1.6-1.8 then yes that 2.5 is prob bad. As resistance increases forage decreases could be causing weak spark

[@jeffreyzondo7560]

Im checking my ignition coils. Kia rio. 4cylinder Output is 5.99 , 5.96 , 6.06 , 6.06. Are they fine or must i change

[@richardwarfordjr.5622]

Usually if one goes bad you have to change them all

[@wyattsdad8561]

Great vid man 👌

[@TheDIYDoc]

@@wyattsdad8561 Thanks man give me a follow and like.

[@wyattsdad8561]

@@TheDIYDoc done ✔️

[@ramone.1021]

Good info . Question in my multimeter In ohms I have the choice of 200 and 200k, where do I put it to 200 or 200k?

[@TheDIYDoc]

@@ramone.1021 200.

[@AutonomyMotors]

As you are looking at 6k+ Ohms then you have to select the the nearest available range, so you might have 200, 2k, 20k, 200k etc, therefore you would need the 20k as 2k won't read when testing. If you only have 200k as your next option that is what you select, but knowing what ohms your looking for will then determine where your Decimel place will be.

[@chipsisshook1741]

If I’m doing this on a motorcycle, my coils look the exact same btw, but should I just replace all of them while I’m at it? I’ll be testing mine tomorrow.

[@TheDIYDoc]

On a motorcycle likely only 2. Also they are likely a different configuration and set up.

[@chipsisshook1741]

@@TheDIYDoccan I test them relatively the same way though?

[@TheDIYDoc]

@@chipsisshook1741 yes. Same concept. Connections are just different is all.

[@jeffreyzondo7560]

Im checking my ignition coils. Kia rio. 4cylinder Output is 5.99 , 5.96 , 6.06 , 6.06. Are they fine or must i change

[@TheDIYDoc]

Idk the standard for your car but if they are all equal that’s reassuring and likely fine.

[@picklefoot]

Good answer. No advice just posting vids

[@johnbenjamindesouza9374]

THANKS

[@samanthadeer9622]

I tested 3 /4 and when intouch the spring and the pins nothing changes

[@TheDIYDoc]

@@samanthadeer9622 hmmm then go old school switch your coils and see if code changes. Not all are made same

[@tonyduong3639]

i checked all my 3 old four coils' output circuit for toyota sienna 2004, they showed nothing at all for output. BUT I didn't understand why my car still ran and idling smoothly. Any ideas?

[@TheDIYDoc]

Not checking resistance properly.

[@ahmedfouad9847]

Is amazing no alot of body is talking and he dont know about this point i have missFire in all cylinder without any fault code on the scanner and i have alot of think after i saw your video i teat my ignition coil is give me 2.9 & 3.0 but the problem i dont know what is the standard range u can help me to know what the stander range or my vehicle 🫡

[@Trudeautthebestt]

i have 4 pins