Inside an Ignition Coil (Cut Open & Explained)

Unlock the secrets of how an ignition coil works in this hands-on video! I take a coil-on-plug ignition coil, hook it up to a QDB 6A driver tool for testing, and then cut it open with an angle grinder to reveal its inner workings. From the primary windings to the secondary windings, you’ll learn how this small but mighty component transforms low voltage into the high voltage needed to fire up your engine.
Whether you’re a car enthusiast, DIY mechanic, or just curious about automotive tech, this video dives deep into the science behind ignition coils. Watch as I break it down step by step, explaining the roles of the windings, the core, and the spark plug connection. Cutting open the coil gives a unique look at what really happens inside - and it might surprise you!
Don’t miss out on this exciting teardown and detailed explanation. Make sure to like, subscribe, and share for more insights into the mechanics of your car!
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#HowIgnitionCoilsWork
#CoilOnPlug
#EngineIgnition
#CarMechanics
#IgnitionSystem
#CoilTeardown
#AutomotiveEngineering
#CarDIY
#EngineTech
#SparkPlugScience
#CarRepairTips
#AutomotiveTech
#CoilExplained
#MechanicSecrets

[@AntonioBuono-gd8uw]

Thanks for taking your time to share all of this. I'm no longer on the spanners. But even at 51 yrs old it's always great to learn and be reminded of the basics. As you could say, the points being old school is what the transitor/ecm does via the distributor.

[@kevinpalmer7452]

First class Demonstration and explanation thanks buddy.

[@allmech_BMW_fault_finding]

Thanks Kevin

[@jeffferg8498]

Well explained.

[@allmech_BMW_fault_finding]

Cheers

[@jasoneyes01]

Nice presentation and tools! That is a Delphi copy. Since Bosch changed the origional pencil coil design around 2010 the only replacements that are reliable are Elder which are made in Italy. The newer Bosch and Delphi consistently fail. Rolls Royce seems to be using Elder for this reason as well.

[@allmech_BMW_fault_finding]

Thanks for the info!

[@Starprowler]

Was the metal shell of the spark plug connected to the ground of the coil to provide a return path for the spark? If not won’t the high voltage find its own path via the path of least resistance?
Thank you for taking the effort and time to show a cross section of the coil.

[@allmech_BMW_fault_finding]

It is indeee

[@SuperKev200]

Nice one 👍

[@allmech_BMW_fault_finding]

Did you like it Kev?

[@SuperKev200]

@allmech_BMW_fault_finding yes mate. Many wouldn't have understood the arking issue also happened on earlier designs of coils

[@allmech_BMW_fault_finding]

@SuperKev200 Thats why I try to educate with these vids bud. I hope you will buy my book when its out Kev 😅

[@SuperKev200]

@allmech_BMW_fault_finding only if I can buy it at a book launch signing 😆

[@craigcavanagh7403]

Im currently a bmw senior technician working towards my masters in the uk and also an apprentice mentor. I point all our apprentices to your page because they could also learn a lot from you. Good work and looking forward to more content.

[@alexdragomirescu5084]

You got me thinking... pretty impressive device actually... 99% of them are coil on plug today.... They're very small compared to 40 years ago, they work in horrible conditions (cold/warm), they have the electronics inside (the driver) and some times...many times have to work soaked in oil😂

[@allmech_BMW_fault_finding]

My thoughts exactly🙂

[@johnbrown4280]

Always wondered about these...thanks...

[@allmech_BMW_fault_finding]

No problem!

[@yamfz6]

Tiktok brought me here.... 👌🏻🥃

[@allmech_BMW_fault_finding]

Awesome. Welcome to my channel

[@andrewthompsonuk1]

This is interesting. What gets me is why are they so unreliable? My 96 and 97 BMWs still have all the original coils after 200K miles each.