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E3 Spark Plugs E3.74 Premium Automotive Spark Plug w/DiamondFIRE Technology (Pack of 1)

4.4 4.4 out of 5 stars 1,024 ratings

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Purchase options and add-ons

Brand E3
Core Material Copper
Gap Size 0.04 m/m Kelvin
Thread Size 14 millimeters
Top Material Type Alloy Steel

About this item

  • Automotive spark plug that fits a variety of domestic applications, designed to increase power, reduce fuel consumption, and improve hydrocarbon emissions
  • E3's patented DiamondFIRE edge-to-edge electrode provides maximum performance with increased efficiency, and a faster more complete burn
  • Designed with colder heat ranges to enable performance modifications, and contains Yttrium-enhanced alloy for a reduction in side wire temperature for less pre-ignition
  • Includes one (1) E3.74 spark plug with a limited lifetime warranty
  • Primarily used in a wide variety of automotive and truck applications
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Additional Details

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From the manufacturer

E3 Spark Plugs

The DiamondFIRE ground electrode configuration increases the amount of combustion pressure created during each power stroke of an engine, which results in a marked increase in power output, fuel economy, and reduced emissions in all gasoline engines.

Smoother Acceleration and Idle – The faster flame propagation initiated by the Patented DiamondFIRE ground electrode results in a more complete burn of the fuel/air mixture.

Energy – More pressure is created against the cylinder and more of the available fuel is put to work. Power is improved 3%-6% on average in typical operating ranges. Results may vary.

Efficiency – Another benefit of E3’s faster flame propagation is less fuel is wasted, resulting in improved fuel efficiency. Lab and Dyno testing typically results in 3%-4% improved Brake Specific Fuel Consumption (BSFC). Results may vary.

Ecology – E3’s more complete burn drastically reduces carbon emissions and carbon build up.

Why Do You Need E3 Spark Plugs?

As the designated catalyst for the ignition of fuel in gasoline powered cars, trucks, motorcycles and small engines, spark plugs are a small, but constant factor in the workings of the vast majority of motorists on the road. What these motorists may not know is that their choice of spark plug could play a significant role in reducing the level of greenhouse gases that their vehicles give off, as well as increasing overall fuel economy and potential power output. This is where E3 Spark Plug's DiamondFire technology comes in.

Key Features

Nickel Plated Terminal End- Corrosion protection at the main contact point with your engine's ignition system.

Projected Insulator Tip- We have the deepest projections in the Industry, promoting better spark-zone refreshing between power strokes, without any negative side effects.

Spark Gaps Tailored to Your Engine- Unlike other 'premium' spark plugs that use a 'one size fits all' gap policy, E3 Spark Plugs have carefully optimized spark gaps chosen to maximize performance for each application.

E3 Spark Plug's patented ground electrode design provides for more efficient burning of your vehicle's air/fuel vapor, leading to more pressure in the cylinder. These improvements are measurable, and confirmed as compared to the designs found in existing spark plugs. The DiamondFIRE electrode projects the spark further into the combustion chamber, bringing it closer to the most robust air/fuel mixture. The initial combustion wave leaves the spark area at supersonic speeds, and the elevated edge provides a chimney effect so the next round of air/fuel mixture gets into the spark zone more easily.

The E3 ground electrode design forces edge-to-edge spark discharge, which is the best way to get a spark to leave a surface. Sharp edges are better at initiating electron migrations, and these accelerated electrons collide with matter inside the spark zone to release additional electrons. This design ensures that the whole population of electrons works to create a plasma channel through which the spark current flows more easily, resulting in an increase in both power output and fuel economy, while reducing emissions in gasoline engines and the build-up of carbon deposits on engine surfaces.

Our Products

Automotive Spark Plugs

E3 automotive spark plugs utilize the latest E3 technologies to help engines operate more efficiently by burning fuel more completely. Get more power, better fuel efficiency and a faster/smoother acceleration. E3 Automotive plugs come with a 5 Year/ 100,000 Mile Warranty.

Small Engine Spark Plugs

E3 small engine spark plugs have the same patented Edge-to-Edge DiamondFIRE ground electrode that has been proven to burn fuel more efficiently. Bring your L&G equipment to life, with quicker starts, more power, better fuel efficiency, and lower emissions. E3 Lawn and Garden plugs come with a limited Lifetime Guarantee.

Power Sport Spark Plugs

For near perfect combustion, put in a set of E3 power sports spark plugs that are Born to Burn! Featuring the patented DiamondFIRE ground electrode, E3 power sport plugs provide more power, quicker starts, better fuel efficiency and lower emissions. E3 Power Sport plugs offer a defect warranty for the 90 days.

Racing Spark Plugs

E3's unique DiamondFIRE ground electrode helps to create more turbulence in the cylinder, and facilitate a faster flame growth. The result is more complete combustion, which results in more power and better consistency. E3 Racing Plugs cover a wide variety of Motorsports applications.

Product Description

The E3.74 auto spark plug is a 14mm, 1.000” reach plug with a taper seat. It fits a wide variety of late model applications, especially Ford applications. E3 automotive plugs have three legs securing the DiamondFIRE electrode to the shell. This allows for excellent heat transfer, and helps to create more turbulence in the cylinder. The patented DiamondFIRE side wire is proven to increase power, reduce fuel consumption and improve hydrocarbon emissions in long-term use. The unique ground electrode and full-size center electrode also provides optimal performance for a guaranteed five years or 100,000 miles. Part Number: E3.74; Resistor: Resistor; Hex Size: 5/8"; Thread Reach: 1.000"; Thread Diameter: 14mm; Seat: Taper; Tip/Gap: DiamondFIRE Fixed Gap Cannot Be Adjusted. Our unique DiamondFIRE open design forces air gap discharges, creating the preferred edge-to-edge spark path. The design allows replenishment of the spark zone with a fresh fuel/air charge, and exposes the flame front more directly to the piston head than other plug designs. This distinctive spark plug design has proven to simultaneously increase engine power output, reduce gasoline consumption, decrease hydrocarbon and carbon monoxide emissions from the engine, and materially extend the life of the spark plug. Our lawn and garden spark plugs help engines operate more efficiently with a faster and smoother acceleration.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

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E3 Spark Plugs E3.74 Premium Automotive Spark Plug w/DiamondFIRE Technology (Pack of 1)


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What's in the box

  • Spark Plug
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    Price$7.16$5.09$27.36$6.99-5% $36.03
    Typical:$37.85
    -56% $7.00
    List:$15.80
    Delivery
    Get it as soon as Tuesday, Apr 2
    Get it as soon as Tuesday, Apr 2
    Get it Apr 2 - 4
    Get it as soon as Tuesday, Apr 2
    Get it Apr 3 - 5
    Get it as soon as Tuesday, Apr 2
    Customer Ratings
    Value for money
    3.4
    4.0
    4.2
    4.5
    3.9
    Mileage
    3.4
    4.0
    4.2
    4.4
    3.8
    Longevity
    3.2
    4.0
    4.1
    3.8
    Sold By
    Amazon.com
    Amazon.com
    Sixity Auto
    Amazon.com
    ZillaZon ✅🏆⭐Authorized
    Amazon.com
    compatible vehicles
    Motorcycle
    Motorcycle
    Motorcycle
    number of items
    1
    1
    1
    1
    gap size
    0.04 meters per meters kelvin
    0.03 meters per meters kelvin
    0.04 inches
    core material
    Copper
    Copper
    Copper
    Copper
    Copper
    Iridium

    Looking for specific info?

    Customer reviews

    4.4 out of 5 stars
    4.4 out of 5
    1,024 global ratings

    Customers say

    Customers like the performance, and acceleration of the spark plugs. For example, they mention that it improves engine performance, throttle response, and gas mileage. That said, they appreciate the faster starts and the ability to save gas. That being said, opinions are mixed on the quality and value of the product.

    AI-generated from the text of customer reviews

    66 customers mention47 positive19 negative

    Customers like the performance of the spark plug. They say it provides better engine performance, smoother idle, and better mpg. They also say the car drives a lot better, seems to have more power, and the throttle response is a little better. Customers also mention that on a dyno, they can feel a consistent steady improvement in acceleration. Overall, most are happy with the performance and recommend the product to others.

    "...to install that increases fuel mileage, gives it more pep, makes it run smoother and accelerate faster all while saving gas and reducing the amount..." Read more

    "...Have had in about several weeks now and the car drives alot better, seems to have more power and helped with transmission problems where my car had..." Read more

    "...done two of these BRAND NEW PLUGS was bad both cylinders 3 and 5 was misfires put old plugs back in and codes was gone...." Read more

    "...fuel efficiency is up a bit and throttle response feels better.. With that said, I would recommend these" Read more

    16 customers mention12 positive4 negative

    Customers like the fuel efficiency of the spark plug. They say it improves gas mileage and power, and throttle response feels better. Some customers also say that it delivers more power, smooth acceleration, and great fuel economy. Overall, most are satisfied with the performance and durability of the product.

    "...of any off hand that are this cheap and easy to install that increases fuel mileage, gives it more pep, makes it run smoother and accelerate faster..." Read more

    "...in about several weeks now and the car drives alot better, seems to have more power and helped with transmission problems where my car had problems..." Read more

    "...CONS:1. You get what you pay for2. Poor MPG (actually average out to car's spec, rather than improve)" Read more

    "...fuel efficiency is up a bit and throttle response feels better.. With that said, I would recommend these" Read more

    10 customers mention10 positive0 negative

    Customers are satisfied with the acceleration of the spark plugs. They mention that they provide better fuel economy, faster starts, and better gas mileage. Some say that the plugs make startups really quick and the engine sounds better. Overall, most are happy with their purchase and recommend them to others.

    "...fuel mileage, gives it more pep, makes it run smoother and accelerate faster all while saving gas and reducing the amount of pollution your pouring..." Read more

    "...I also notice a quicker ignition and less hesitation when I get on the gas! Definitely recommend and would definitely buy again." Read more

    "Great value saves gas and start up fast" Read more

    "...The plugs definitely needed replaced, these plugs fired immediately with no issue and my car seems to be running much smoother then before...." Read more

    3 customers mention3 positive0 negative

    Customers find the installation process of the spark plug to be easy. They mention that it increases fuel mileage and makes their car run better.

    "...I can't think of any off hand that are this cheap and easy to install that increases fuel mileage, gives it more pep, makes it run smoother and..." Read more

    "Great plugs they fire very hot made my car run better easy to start my car" Read more

    "No problems with install. Felt a difference in acceleration right away yet I haven't noticed much change in fuel consumption...with the plugs alone...." Read more

    51 customers mention32 positive19 negative

    Customers are mixed about the quality of the spark plugs. Some mention that they are good spark plug that run smoothly, while others say that they melted and damaged their engine. Some customers also say that the plugs were loose at the white part and had metal sticking out of the end where it should not.

    "The spark plugs are great. I added the sparkplug to my 2013 for f150 xlt super cab with the thyclinic are fantom my air intake...." Read more

    "...the plug wires with performance wires too but, well the V6 doesn't use spark plug wires, oh well on to the next upgrade or MOD on the list, if you..." Read more

    "...The Ford Coyote 5L engine is the simplest engine to replace plugs on EVER! 2) These plugs so far perform beautifully...." Read more

    "Great plugs they fire very hot made my car run better easy to start my car" Read more

    19 customers mention10 positive9 negative

    Customers are mixed about the value of the spark plug. Some mention it's worth the cost, easy to install, and saves gas. However, others say that it'll not be worth the added cost for the performance gains.

    "...I can't think of any off hand that are this cheap and easy to install that increases fuel mileage, gives it more pep, makes it run smoother and..." Read more

    "...It wasn't any different than OEM. Not worth it IMHO." Read more

    "PROS:1. Affordable2. Fixed gap as advertised3. Great response4. Would recommend to anyoneCONS:1...." Read more

    "...Not really worth the added cost for the performance gains, either." Read more

    7 customers mention4 positive3 negative

    Customers have mixed opinions about the fit of the spark plug. Some mention that it's the right fit, while others say that it doesn't fit their truck.

    "...Love these spark plugs and fit great no need to gap them and performance wise agree to disagree but i feel a difference." Read more

    "They are wrong size for my truck and the information on the website needs to be changed so someone else don't make the same mistake" Read more

    "They fit my vehicle perfectly and performs excellently" Read more

    "Doesn't fit my 2009 Chevy Silverado" Read more

    Nice plug.
    4 Stars
    Nice plug.
    So I didn't notice any change in the responsiveness of the engine nor any increase in power, but at least I did not lose any either. I gained an increase of 0.6 mpg which is not a huge increase but at least it's something. This is why I waited before writing a review so I could drive close to the same miles to show a before and after, and to give you a better idea as to if there was any noticable change in anything
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    Top reviews from the United States

    Reviewed in the United States on July 26, 2016
    15 people found this helpful
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    Reviewed in the United States on May 27, 2020
    3 people found this helpful
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    Reviewed in the United States on July 7, 2018
    30 people found this helpful
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    Reviewed in the United States on May 1, 2022
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    4.0 out of 5 stars Nice plug.
    Reviewed in the United States on May 1, 2022
    So I didn't notice any change in the responsiveness of the engine nor any increase in power, but at least I did not lose any either. I gained an increase of 0.6 mpg which is not a huge increase but at least it's something. This is why I waited before writing a review so I could drive close to the same miles to show a before and after, and to give you a better idea as to if there was any noticable change in anything
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    8 people found this helpful
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    Reviewed in the United States on November 15, 2023
    Reviewed in the United States on February 17, 2023
    Reviewed in the United States on July 27, 2019
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    1.0 out of 5 stars Not impressed.
    Reviewed in the United States on July 27, 2019
    I bought 6 of these and figured if they were as good as advertised that I would be offsetting the ridiculous price in the long run. Well, first off the item was thrown around so much that they all busted out of their original boxes. The gaps are all slightly different so I could tell they were busting into each other quite a bit. I handle even cheap spark plug delicately, so to have these overpriced ones treated so badly is a big red flag to me. Most of that can be blamed on UPS for doing a not so great job, but then upon closer inspection, I noticed some of them aren’t even the same size. On top of being busted, they somehow also managed to send the wrong parts. I don’t know, this just put a bad taste in my mouth with how expensive they were. Will update review when/if working part arrive.
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    9 people found this helpful
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    Reviewed in the United States on May 14, 2022
    One person found this helpful
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    Top reviews from other countries

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    Bali
    5.0 out of 5 stars Quality products
    Reviewed in Canada on September 9, 2023
    Alfredo Ruiz
    2.0 out of 5 stars Menor rendimiento y menos potencia, no comprar
    Reviewed in Mexico on June 5, 2021
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    Alfredo Ruiz
    2.0 out of 5 stars Menor rendimiento y menos potencia, no comprar
    Reviewed in Mexico on June 5, 2021
    No tuve mejor rendimiento de gasolina, ni mejor desempeño de motor.
    No les recomiendo que las adquieran, son muy caras, las bujías de Iridio denso dan mejor potencia y rendimiento, y son más baratas y confiables.
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    One person found this helpful
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    Western
    5.0 out of 5 stars Great quality.
    Reviewed in Canada on May 16, 2021
    denis gagnon
    5.0 out of 5 stars Recommander
    Reviewed in Canada on November 13, 2020
    Lorne Ziemer
    4.0 out of 5 stars Work great
    Reviewed in Canada on March 10, 2021