How to Test an Ignition Coil Pack - Best Testing Procedure

In this video I show you exactly how you can quickly determine whether you have a bad ignition coil pack or not and what is the correct testing procedure to make sure it is indeed the coil and not some other component like spark plug wires, spark plugs, ignition module or other electrical components of your ignition system.

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Disclaimer:
Due to factors beyond the control of Ratchetsand Wrenches, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Ratchetsand Wrenches assumes no liability for any property or personal damage that may arise from doing a repair on your vehicle after watching any of my repair video's. Due to factors beyond the control of Ratchetsand Wrenches, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Again Any injury, damage or loss that may result from improper use of tools, equipment, or the information contained in this video is the sole responsibility of the user and not Ratchetsand Wrenches.

[pctuterman]

You make things so simple when you explain. I always learn a lot from your videos. 👍

[brendanmccreanor]

Thankyou. I found out after looking at this video and checking the coils on my sc400, that My mechanic didn’t secure the cam sensor wires, so the cam wire was cut by the fan belt, led To a crank no start. My mechanic not knowing better, Or checking, , , excessively jumped it trying to start, leading to cooked the coils. So I towed it home and I found the damaged cam sensor wire, fixed it. Saw your video and checked coils. I had spare and changed. Great! Got my SC400 back. What a don’t understand is 2 mechanic shops couldn’t fix it. Thanks for sharing your knowledge 🙏 I will repay you. Mc, from Australia 🇦🇺

[akhenra]

Excellent video, clear, concise, and naturally born instructor. This video just saved me a couple thousand dollars. I had techs telling me a "dead cylinder, coil packs .... LIKE YOUR'S .... don't go out/bad" "it's the internal motor that needs to be repaired BUT we won't know until we get it open..." I used your hose to plug test on the miss fire cylinder (#3) = No Spark. I used the same test on Cylinder 1, 2, & 4 and all of them had spark! Just replaced the coil pack I purchased in stock from Autozone for $68.00 and the Jeep is purring like a kitten again - THANK YOU!

[MichaelJohnson-ciwm]

Your a dead set ledgend mate. I like how your videos are straight to the point and the information is clear. Good camera work.

[cobbysparks]

Dude! Not only are you good, you're a good teacher too.

[gocart]

Nice. A simple but effective way to diagnose a no spark condition. Using the test light is genius.

[WayneYow]

Absolutely excellent, so easy to understand. I managed to test my new integrated coil on plug and found one coil to be faulty. Got it warrantied now.

[daylenb]

This is a great video and it helped me with what I need but please everyone reading this DO NOT default to back probing. Make sure you know what the manufacturer of your vehicle recommends for testing. Some manufacturers specifically do not want you to back probe. It can cause damage to connections and terminals. If a manufacturer says back probing is ok make sure to grab a back probe adapter for your DMM. A paper clip works but if you accidentally cut a wire or damage a wire it can cause an open or high resistance in the wire. Possibly a short to ground if it's close to metal or a terminal. Just so you guys are aware :P

[iamnotinline]

Much easier way to check for spark; hook up a timing light! Connect the timing light to the plug wire, start engine, light flashes, you have spark, move to the next cable. That only proves spark, it could be a weak spark, so you should test the wires and coil to ensure they're within specs. Also check that the plugs are in good shape and correct gap.

[Air-vfcn]

great video Everyone be sure to not have your fingers touching the metal on your multimeter it can give you bad reading .. thanks great video

[Sabs]

hello dude
congratulation for so useful and timely video, it is very important to know how this core automotive part work, best regards from monterrey mexico,

[KeithSWD]

This is the safest and accurate test than i did few days ago. Thanks a lot!

[billy]

your explaination is so clear and easy to understand.

[fulano]

What you do is swap coils and see if the problem transfers. If it doesn’t, check your fuel injector to see if it has power going to it. Then by seeing what the recommended ohm reading is and test with ohmmeter. If the fuel injector is ok, THEN watch this video and do all the other steps.

[WUMA-WattsUp]

Excellent content. Thanks for sharing.

[javieworks]

My resistance was about 6k on both sides on a 4-cylinder 12' Jetta...which is half of the one your testing on this video. Does it matter what brand of vehicle it is?

[divemaster]

Great explanation as usual. You’re an excellent teacher.

[jerryoliver]

Great video I wish all of the people who submit videos were this good .

[EYEStoSEEandEARStoHEAR]

Really enjoyed the way you you took the time to explain explain the difference between primary and secondary coil very informational thank you for that

[RC-Heli]

I've got one of these on an 02 Ford Focus that's misfiring on number 4 at idle about every minute or so. I have an inline spark tester and I can see it misfiring ever so often. Under load I have not checked it but I bet its misfiring even more.