Ignition Coils Replace ALL OR ONE at once | Check Engine Light Flashing

One of the most vital of all ignition system components is the ignition coil. This apparatus converts relatively low voltage electricity derived from a vehicle’s battery, into high-voltage capable of being dissipated by a vehicle’s spark plugs. During this dissipation of energy, a volatile mixture of air and fuel is ignited within each respective combustion chamber.
Unfortunately, like any electrical component, an ignition coil is prone to eventual failure, leaving one to contend with a host of troubling symptoms as a result. The ability to recognize these symptoms can prove helpful when attempting to diagnose the issue at hand, thereby expediting a vehicle’s eventual return to service.
An ignition coil is a device used to transform a vehicle’s supply battery voltage into high-voltage electricity, intended for rapid discharge. Devices of this nature are typically described as step-transformers or induction coils.
The following are several of the most common symptoms associated with a failed ignition coil.
Illuminated check engine light
Reduced engine power
Loss of fuel economy
Intermittent stalling
Hard starting
Backfiring
Excessive engine vibration
Normal wear and tear
Excessive vibration
Abnormally high engine heat
Compromised spark plugs
In the most severe cases, prolonged operation of an engine with a faulty ignition coil can actually do irreversible catalyst damage. This occurs when unburnt fuel is dosed downstream, allowing a catalytic converter’s internal media to superheat and deteriorate. As a result, one incurs a significant expenditure in both time and money, all of which would likely have been avoided.
In any event, a vehicle’s faulty ignition coil should be isolated and replaced as soon as possible. Doing so will likely prevent excess hardship, and mitigate the risk of being saddled with an even higher repair bill.
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[@Pantherman1979]

If it doesn't murder my wallet, I usually go with what the OEM used, I had an alternator die on my 11 CRV this week; replaced it with a Denso.

[@Mike_Stramaglio]

Great video. On this topic, is there a way to determine the health of your current ignition coils? Is there some sort of diagnostic that could be done on them? I have a 2007 Toyota Camry that has 117K, fairly low mileage for that model year. At around 70 K my ignition coils Went on me and caused problems; misfiring and flashing check engine light. After replacing them, all is well. I’m just trying to cut that off at the pass from happening again if possible. Thanks for any advice.

[@kalani1987]

I've heard that when these coil on plugs go bad, it is usually just the rubber boot with spring. Is it advisable just to change that part out?

[@franticscantic]

i have an audi 2018 q3. engine light on for coil #1. bought the right coils and spark plugs, replaced them all. light goes off then on again. (engine was skipped somewhat too). engine light goes off, then on again. changed coil #2 with #1. engine light goes off then on again after awhile. changed coil #1 with new coil and spark plug. light goes off then on again...some skipping some times and not skipping with the engine light on. what do you think the problem is?? the machine checking the car is always saying coil #1.

[@bundysgarage]

what do you mean when you say skipping?

[@simonac688.]

great info here 👍👍

[@Toolaholic7]

The aftermarket coils from Accel and MSD are junk.The AC Delco coils are made by Denso rebranded as AC Delco

[@bundysgarage]

How do you know that?

[@Toolaholic7]

@@bundysgarage Denso makes some of AC Delco's parts rebranded as AC Delco

[@JohnDoe-gk5xj]

Just one coil pack is bad trust me to change all of them I went through hell changing one😢at a time

[@k9under]

Me old school everything I own have a distributor and wires.

[@davebrunson125]

While you're right there change the plugs

[@johovamassey5790]

Fake autozone coilpack will make it stall within a year junk