7 Best Ignition Coils in 2019 – Reviews & Buying Guide
In simple terms, an ignition coil is a component that is responsible for providing the energy required for creating the spark that ignites fuel in gasoline engines.
The coil does this by basically acting as a step up transformer. It increases the voltage from the battery to thousands of volts, which are transferred to the spark plugs to ignite the fuel in the combustion chambers.
However, these coils come in different types and qualities but ultimately, the best one should help your engine achieve low emissions while providing a high power output.
This means that you need to be very cautious when selecting this product and to help you do this, this article looks at the best ignition coils in the market, showing you how their features are beneficial to your car’s engine performance.
- 7 Best Ignition Coils - Reviews
- How to Buy the Best Ignition Coils
- When to Replace the Ignition Coil
7 Best Ignition Coils - Reviews
1. Ena Curved Boot Ignition Coil
Select Ford, Lincoln, Mercury vehicles
2. Ena Straight Boot Ignition Coil
Select Ford, Lincoln, Mercury vehicles
3. ECCPP Pack of 8 Ignition Coil
Select Ford, Lincoln, Mercury vehicles
4. Bosch 0221504470 Ignition Coil
Select BMW cars
5. QYL Pack of 4 Ignition Coil
Hyundai Accent, Kia Rio, Rio5 LX
6. Parts Galaxy Ignition Coil Kit Set
Nissan Altima, Sentra
7. King Auto Parts Motorcraft Set of 8 Ignition Coil
Select Ford, Lincoln and Mercury vehicles
Editor's Rating: (4.5 / 5)
- Fits: Select Ford Lincoln and Mercury v8 and v10 vehicles.
Coming as a pack of 8 ignition coils, this product features a curved boot and is compatible with a number of old Ford, Lincoln and Mercury vehicles.
These include Ford’s 4.6 and 5.4-liter v8 F-150 (up to 2003 models), Explorer (up to 2005 models), Expedition (up to 2004 models) and many others.
In terms of design, these ignition coils are constructed using the highest quality copper and have a unique winding design that reduces their weight and size without compromising their quality.
This means that each coil is easier to handle during installation (because it is light). It also means that misfires will be dealt with because it supplies a high voltage to the spark plugs, resulting in a high energy output while producing low emissions.
However, its curved construction might present some challenges as you install it or uninstall it. But if you consider its durability, once you install it, it will be a long time before you consider doing a replacement.
The product is corrosion and abrasion resistant and this contributes greatly towards its long lifespan, which is about 100,000 miles (roughly 10 years).
Additionally, it is very affordable and therefore, you get good value for your money. People may argue that cheap is expensive but to assure you of good quality, this set of coils come with a lifetime warranty, making it worth buying.
Editor's Rating: (4 / 5)
- Fits: Select Ford, Lincoln and Mercury v8 and v10 vehicles.
The Ena Straight Boot ignition coil also comes as a pack of 8 and is quite similar to its curved boot counterpart. The main difference between them is the straightness or curviness of the coil boot.
This straight boot is sort of an upgrade to the curved boot, which makes it slightly more expensive but it fits on newer Ford, Lincoln and Mercury 4.6 and 5.4-liter v8 engines.
On the downside, these coils are compatible with a fewer number of cars as compared to their curved counterparts but if they fit, they are very reliable because each is made using high-grade materials that makes them durable, corrosion and abrasion resistant.
In terms of functionality, these coils eliminate misfires, increase the car’s horsepower and reduce emissions, leaving you with a very efficient vehicle.
Editor's Rating: (4.1 / 5)
- Fits: Select Ford, Lincoln, and Mercury 4.6 – 6.8-liter engine vehicles.
If you own a Ford, Lincoln or Mercury vehicle, these are good replacement ignition coils to consider. They come in a pack of 8 and can fit in a couple of 1997 – 2017 Ford, Lincoln and Mercury 4.6 – 6.8-liter engine vehicles.
What makes this set a good replacement option is that the coils are made using high-quality materials that make them stable and reliable enough to meet and exceed OEM standards.
This means that you should expect no misfiring, increased horsepower and reduced emissions for a long time once you install these.
Construction wise, the coils have curved boots, which makes their installation a bit challenging. But due to their durability, this won’t be a big issue because once installed, you will probably have sold your car before requiring any replacement.
The product set is quite affordable and comes with a 1-year warranty, just in case you have doubts about the quality of the coils.
One important thing to note is that these coils can be damaged when placed in hot or wet environments so you should be careful when handling them.
Editor's Rating: (4.1 / 5)
- Fits: Most BMW cars.
Most people associate Bosch with electronic devices but the company is actually one of the best ignition coil brands in the market.
The company is German and it largely focuses on the local market with BMW cars being their primary market and this makes the 0221504470 the best ignition coil for BMW.
The product is the most expensive set in this review but it comes as a pack of 6 pieces of high-quality ignition coils that are very reliable and very durable.
In terms of design, these coils resemble the outward appearance of the older version but their internal mechanisms are a complete upgrade from the past.
Most noticeably is the missing snap sound that was associated with the installation of the coils.
Whereas the old coil gripped the spark plug tip causing this snap sound, this new product incorporates the use of an HV brush and a contact spring, which does not snap into place but provides better contact with the spark plug.
This leads to better performance since the high voltage is efficiently passed through to the spark plug because of the tight contact between the two.
Editor's Rating: (4.7 / 5)
- Fits: Hyundai Accent, Kia Rio, Rio5 LX
QYL’s ignition coils are the most affordable products in this review but they come as a pack of 4, which justifies the price.
The coils are designed to meet or exceed OEM performance due to their high-quality internal components. These include high-quality copper wires and wire coatings that resist cracks and other forms of imperfections that lead to failures.
This design enables the engine to achieve high energy output with low emissions by supplying a high voltage output to eliminate misfires.
Additionally, their uniquely wound copper wires reduce their weight and sizes, without sacrificing their quality.
Collectively, these features make this coil set the top-rated ignition coil in this list.
Editor's Rating: (4.2 / 5)
- Fits: Nissan Altima, Sentra
Japanese vehicles are known for their reliability, durability and of course, simplicity. Since the Parts Galaxy Ignition coil set is meant for the Nissan Altima and Sentra 2.5 liters engine, the coils are also designed with the three qualities above in mind.
The result of this is high-performance ignition coils that are built according to the highest quality standards and this qualifies them to be direct replacement parts after OEM coils burn out.
In terms of quantities, the set includes 4 coils, which come at a relatively high price for such a small quantity. However, this is what you would expect from such high-quality products.
If the price scares you, the set comes with a limited lifetime warranty that assures you of a full refund or a replacement if the coils fail due to manufacturer-related defects.
Construction wise, it has three prong connectors as compared to the conventional two prongs in other ignition coils.
On the inside, these three prongs lead the current to its copper wirings that form the coils for the voltage step up. The step up then leads to stronger firing once this high voltage is transmitted to the spark plugs.
Editor's Rating: (4.3 / 5)
- Fits: Select Ford, Lincoln, and Mercury vehicles
The King Auto Parts Ignition Coil set is quite costly but it contains 8 coils and an additional 8 Motorcraft spark plugs as accessories.
This complete set enables you to change both the ignition coils and spark plugs in one go, effectively giving you a revitalized power system that will surely improve the fuel burn, leading to increased horsepower and reduced emissions.
These components are compatible with a number of Lincoln, Mercury, and Ford vehicles, which include the 2008 5.4-liter V8 Lincoln Navigator and Mark LT, the 2008 4.6-liter V8 Mercury Mountaineer, 05-08 Ford Expedition, 04-08 F-150, 05-08 F250, and 05-08 F-350.
Internally, the ignition coils are filled with a multi-spark epoxy that makes them more rugged and capable of handling a lot of vibrations such as in off-road driving or even racing.
They are also small and lightweight due to their unique coil windings, which do not affect their performance.
This design means that they meet and exceed OEM ignition coil specifications, making them worthy replacement options.
How to Buy the Best Ignition Coils
When it comes to ignition coils, compatibility is the biggest factor to consider. Each product is usually designed to fit in certain car engines.
The problem is usually in the engine design because car manufacturers construct their engines differently, having different fittings and slots with different shapes and sizes.
Therefore, each ignition coil set is usually meant for a particular car or cars that share a commonly designed engine.
With this in mind, it is important to always check which car engine the product is made for so that you dot waste your money on something that won’t fit.
Accessories are always an added plus. They give you something extra that makes the deal sweeter.
In the case of ignition coils, accessories usually come in the form of spark plugs because these coils function with the plugs to fire up the engine.
If you get an ignition coil that comes with such accessories, it should be worth considering and buying because this will allow you to change both parts, leaving you with a renewed firing system. The result of this would be a better performing engine.
However, accessories can also come in many other forms. The more they are, the better the deal.
The only important thing to note here is that you should compare the prices of the product without the accessories, with the accessories and the accessories alone. This will help you determine if the deal is good or not.
Different companies are known for producing different quality products and the same applies to the production of ignition coils.
Brands such as Bosch are well known for producing high-quality ignition coils for German cars. On the other hand, Parts Galaxy is well known for producing Japanese car ignition coils while ENA is well known for producing the coils for North American cars.
As you narrow it down to the best ignition coil for your car, it is important to consider such brands because they are well known for a good reason. Their products are of very high quality and are the best replacements that you can get.
#4. The number in the pack
In modern cars, each spark plug is usually connected to its own ignition coil. Therefore, if you have a V8 engine, you will need to change 8 ignition coils once they start failing. This means that you should buy a pack that has at least 8 coils
Therefore, it is important to consider how many coils your car needs so that you can buy a pack with that exact number or more.
A warranty is important for many reasons. First, if the product has a manufacturer related defect, you simply have to invoke the warranty by informing the seller so as to begin the refunding or replacement process.
Without it, you might be in trouble after you make the purchase because anything can happen.
Another important thing to consider would the warranty duration. Some ignition coils have a 1-year warranty, which is good, while others have a lifetime warranty.
A product with a lifetime warranty is the best one to consider because it essentially means that your investment is protected up to the day it completes serving its purpose and requires a replacement.
When to Replace the Ignition Coil
Obviously, it is not ideal to wait for the ignition coils to fail completely and ground the car so as to consider replacing them.
Well, how exactly can you tell when these components are beginning to fail? Below are the symptoms of failing ignition coils.
Backfiring literally means what the word says, which is producing fire at the exhaust. This usually means that unburnt fuel is being released to the exhaust system as a result of a failing ignition coil.
#2. Hard Starts
Ignition coil failures usually result in a few spark-plugs not firing properly because they don’t receive the right amount of energy. This will result in hard starts, especially during cold weather.
Therefore, this is a good sign that you need to replace your ignition coil before the car refuses to start at all.
#3. Reduced Fuel Economy
When the spark plugs receive less power to ignite the fuel, the engine will struggle to attain its required power in response to the throttle.
In response to this, the on-board computer will try to compensate for the reduced power with an increase in fuel injection and this will drastically reduce the car’s mileage per gallon.
Due to the irregular burning of fuel during the combustion cycles, the vehicle will cough and spit while also vibrating intensely when in idle mode due to a reduction in rpm.
Ignition coil failure also means that the unit can release voltage bursts irregularly, leading to irregular spark production by the spark plugs. This might cause your engine to stall or even shut down completely.
When to replace: If your car starts exhibiting any of these symptoms, it would be best to replace your ignition coils immediately.
An important ignition coil maintenance tip to remember is to always keep your spark plugs in good condition because they are the primary cause of ignition coil failure.
As you can see, there is a lot about ignition coils that you might have assumed before thinking of buying a set for your car.
However, with this information, your car should not trouble you if it starts exhibiting the ignition coil failing symptoms explained above.
You will be able to diagnose the situation before it gets worse and get the best replacement as soon as possible.