Advance Auto Parts Logo
Choose a Store
  • Shop All
  • Replacement Parts
  • Performance Parts
  • Accessories
  • Oil & Fluids
  • Special Offers
  • Advance Rewards
  • Advice & How-Tos
  • Project Guides
  • FAQ / Help Desk
Loading...
Share
Product thumb
Product thumb
Product thumb
Product thumb
Product main large

E3 DiamondFIRE Automotive Spark Plug (E3.70): More Power & Fuel Savings

(718 reviews)
Part # E3.70
5 yr replacement if defective
Loading...
How Would You Like To Get This Item?

Store Pickup

Loading...Loading...Loading...

Same Day Home Delivery

Loading...Loading...Loading...

Home Delivery

Loading...Loading...Loading...
Loading...
Loading...
Loading...Loading...Loading...Loading...Loading...

Product Information

Product Details
Part No. E3.70
Warranty Details (5 YR REPLACEMENT IF DEFECTIVE)
The Spark Plugs are the product of years of fundamental research in the combustion field. The unique patented electrode configuration of these new The spark plugs 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. E3.70 is a 16mm, 0.860 reach plug with a taper seat. It fits Ford Triton applications from 2004 to 2008. E3.70 is a unique design that solves a problem with the original OE application. The shell is made as a single piece, as opposed to two pieces, so it resists seizing in the engine and breaking apart when being removed. The automotive plugs have three legs securing the Diamond FIRE electrode to the shell. This allows for excellent heat transfer, and helps to create more turbulence in the cylinder. The patented Diamond FIRE ground electrode is proven to increase power, reduce fuel consumption and improve hydrocarbon emissions in long-term use.

Product Features:
  • The design of the Ford Triton engine can a cause build of carbon on the spark Plug threads, which may make removal difficult. E3.70's shell is made of a one-piece design, which means it WILL NOT break during removal.
  • E3's Diamond Fire edge to edge ground electrode provides maximum performance with increased efficiency and a faster more complete burn
  • Smoother Acceleration & Idle - The faster flame initiated by the spark plug results in a more complete burn of the ingested fuel charge. More pressure is created against the piston more fuel is put to work
  • Energy - Power output improved up to 6% on average in the typical operating ranges. Results will vary.
  • Efficiency - The "diamond shaped" side wire electrode projects the combustion spark in a way that more quickly ignites the air/fuel mixture, thereby creating a significantly faster and larger flame kernel. The result is that more fuel is put to work durin
  • E3's patented Diamond Fire Technology provides a cleaner burning combustion, which translates into fuel savings and reduced engine carbon deposits
  • Enhanced Heat Transfer: Three legs secure the Diamond FIRE electrode to the shell, providing excellent heat transfer and creating more turbulence in the cylinder for better combustion.
  • Specific Fit for Ford Triton: The E3.70 spark plug is designed to fit Ford Triton applications from 2004 to 2008, ensuring compatibility and optimal performance for these vehicles.
Specifications
Center Electrode Core Material:
Copper

Center Electrode Tip Material:
Nickel

Gap:
Pre-gapped at the factory to meet O.E. requirements; Gap cannot be adjusted

Ground Electrode Tip Material:
Nickel

Hex Size:
5/8 in

Insulator Height:
63.67 mm

Pre-Gap Size:
1.016 mm

Reach:
25.4 mm

Resistor:
Resistor

Seat Style:
Tapered
Loading...
Loading...Loading...Loading...Loading...Loading...
4.11 out of 5
718 Customer Reviews
60% of respondents would recommend this to a friend
Ratings Distribution
5 Stars
467
4 Stars
99
3 Stars
23
2 Stars
19
1 Star
110
Test Review number 2Test Review number 2
Image upload test (axios upgrade0Image upload test (axios upgrade0
Pros
147
Easy To Install
131
Improves Engine Efficiency
127
Increases Power
70
Durable
34
Lightweight
Cons
446
No
60
No Improvement In Performance
38
Decreases Gas Mileage
35
(null)
18
Yes
Most Liked Positive Review
They work!
Despite the mixed reviews, I had to try these for myself just to see first hand. It's only a $20 investment for a 4 cylinder so what the heck? I knew from the really bad negative reviews I had seen that the spark plugs weren't the cause of the wear on the plugs themselves. The spark plug isn't at fault when an engine is running too lean or too rich. If you have been keeping a good eye on your AFR (air fuel ratio) and you know that your vehicle is running within the limits of what it was designed I'd suggest you give these plugs a shot. I put them on my 1992 Nissan Hardbody and I was very surprised at the instant increase in horsepower. It's not a placebo either. I had just put the previous plugs in less than 2 weeks ago and upon inspection they looked like new. Put the E3 plugs in and took it for a drive - It's unreal how much of a difference these things made in torque/power to the wheels. I've drove 150 miles since installing them and I've used 4.7 gallons of gas, so you can figure 32 mpg avg based on my driving. With the NGK OEM plugs I was getting aprox 28.5 mpg. I'd say that these plugs definitely do their job, not sure whats going on with all the negative reviews, but I can say that I'm not paid to leave this review I'm just stating it from my own experience, If I had been disappointed believe me, I'd made it clear in this review. People who have newer vehicles that implement more computerized controls over their engine probably will have a lesser improvement with these plugs - or quiet possibly negative effects. The ECM is designed to run under certain conditions and some of those a different spark plug can't cause miracles. OBD-1 systems will most likely see more benefit than OBD2 and CARB vehicles may benefit the most. Are they worth $5 a piece, well I paid it, so I won't complain - but if they were a little cheaper I'd probably gave these plugs a 5 star review too!
Most Liked Negative Review
GARBAGE! DO NOT BUY!
Bought these in September and by March with less than 3000 miles on them 2 were misfiring and 1 of those 2 was completely melted through. I mean torched not even just burned out, torched. I am lucky these plugs didn't cause any major damage to my engine, that I know of yet (knock on wood). Long story short I will never buy these again and will tell everyone I can not to buy this product or any E3 product. Thankfully Advance returned them as defective.
Loading...
Loading...Loading...Loading...Loading...Loading...
No results
Loading...
Loading...Loading...Loading...Loading...Loading...
Feedback

Order Lookup

Help Desk

Store Locator

In Store Services

Mobile App

© 2026 Advance Auto Parts
Privacy Policy
Terms of Use
Site Map
ADVANCING A WORLD IN MOTION®