Product ReviewsSpark Plug-SE E3 Spark Plugs E3.58

Best plugs available, period.

I read a review in which someone complained about these plugs and called them "a waste of money". This person obviously has serious engine problems that it wouldn't matter what spark plugs used, as his problem is not related to or a result of using these.
I am a professional mechanic, and I specialize in Jeeps, mostly the 4.0 or 2.5 Cherokee. I put these in a 93 Cherokee with a 2.5 four cylinder, and my dad also purchased a set for his own Cherokee, a 95 4.0. From the moment we each started our engines after installing these, the improvement was immediately and significantly noticeable. The plugs I took out were in great shape, less than 5000 on them. So this is more than just some little improvement you would get simply by putting in any old new plugs because your old ones were done for. This is one of the most significant improvements I've ever seen a single upgrade make to a gasoline engine. My dad and I agree 100%, both of our Jeeps have a much smoother idle, they start quicker, throttle response is amazingly more predictable and linear. Gas mileage improvement. These are simply the best spark plugs ever designed in the history of automobiles. If anyone tells you otherwise, they are not qualified to make a statement on this subject.
My disclaimer is that I can only attest to the improvements I've observed in 4.0 and 2.5 Jeep engines. Others may respond better, not as much, or produce anything noticeable. In my opinion however, I think that this type of plug used with the correct application would produce noticeable improvements, regardless of the engine. I believe it is one of the most valuable additions if you seek to optimize your engine's performance. I was willing to give these a try, and I am very glad that I made the right decision. These are the only spark plugs I will ever use, nothing but these. Unless they make something even better in the future. But if you are reading this because you are looking for new plugs for your Jeep, these are what you want to get, for sure. I would also recommend getting a CRT, MSD, or similar higher output ignition coil, the 45,000 volt type. To complete optimization of your ignition system, also use 8mm or 8.5 mm plug wires, and your distributor cap should always have the brass terminals. And don't forget a quality rotor along with it. For all the naysayers, you need to address the actual problem your engine has, rather than complain about a set of spark plugs. If your engine is running poorly due to issues unrelated to the ignition system, it will not matter what type of spark plugs you use, none are going to fix the problem.
In summary, no other spark plug comes close to improving the performance of your engine. If you have an XJ Cherokee, Wrangler TJ or YJ, or Grand Cherokee, you must get these. They are so good that I just had to share this with others, I usually don't write reviews, but this was so profound that I felt I would be doing a disservice to fellow enthusiasts by keeping it to myself.Read full review...

Verified purchase:  Yes | Condition: new | Sold by: trueblueautoparts

Waste of time and money

First all, these lasted 2 months,seller did offfer for me to return them, but at my cost, not worth the hassle, the only increase in power is obvious,its a new plug,anything will run better than old wore out ones. STICK WITH THE ORIGINAL PLUG, auto makers spent millions to determine best plug,for power,torqe,and fuel economy, trust me, stick with them, cause no backyard garage is gonna make a better plug than the engineers~!Read full review...

Verified purchase:  Yes | Condition: new | Sold by: trueblueautoparts

95 jeep wrangler yj 2.5 4cylinder

bought few different types brands of plugs on 95 jeep wrangler 4 cylinder.
Realizing it had quite few miles on this jeep I had purchased many items to help increase some power. I have recently purchased the 4 hole injectors cold air intake a larger coil new plugs TPS. IAC fuel filter run the 44K fuel system cleaner through it oil additives and sure few things forgetting.
the jeep still started hard and what in my mind didn't performed to standards.
I do run 33 inch tires 488 gears slip your eliminator chrome alloy axles.35 spline lifted.
After trying many plug types messed with a gap from .032 all way up to .065 which the new coil recomended the ability setting for plug gap.
it continued to stary hard crazy loss of power on hills even small highway street hills.
when I installed the E3 plugs no gap required at all install and go. it has corrected the starting issue idle issue and performance is acceptable on roads off roads handle low gear speeds and power issues what is to be expected has been reached amazing adiition to the jeep happy with this product not a race jeep but a off road jeep worth ever penny spent highly recomended and only plug I will ever run again when I install plugs in anything again
thanks E3 satisfied customer of your plugs

TerryRead full review...

Verified purchase:  Yes | Condition: new | Sold by: trueblueautoparts

Awesome plugs, boost energy; no issues in over a year.

I used them in my '97 Jeep 4.0 TJ, (last model year with a single ignition coil) along with a Holly capacitive-discharge ignition, which produces a three-legged spark-plug charge on normal plugs. Since these are made to also produce a three-legged spark-plug charge, I thought they should naturally compliment each-other. They work together seamlessly. With the addition of a 340 LPH fuel pump and a 62mm throttle-body on a '99 Jeep manifold, my Jeep, even with a 4.65 gear-ratio, out-runs many cars/engines that I never thought possible.And there's no sign of drag from the 35" tires. Normal driving gets normal Jeep gas mileage. Race-car driving gets like 8-miles to the gallon; which is now great fun.Read full review...

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Verified purchase:  Yes | Condition: new | Sold by: necycleshop

Great for my 2000 Jeep Sport inline 6 cylinder. Better than expected.

I've had them in for a few months, my overall gas mileage improved slightly, but my 2000 Jeep Wrangler Sport with inline 6 cylinder starts and runs great. Friends warned not to buy E-3 Brand plugs, but I did and I will again. Great value, great performance.Read full review...

Best spark plugs on the market

I've been both a racer and mechanic all my life. I bought my first set of E3's about 10 years ago and they are absolutely the best plug a person can by. I've run these in my daily driver and a 1000 horse race car. I've used other brands but none compare to these. The key is how they fire. Instead of a direct spark these form a round pattern which does increase both power and fuel mileage. I will always by E3 spark plugsRead full review...

Verified purchase:  Yes | Condition: new | Sold by: true-value-parts

Excellent product and excellent service

Excellent product and excellent service, was getting 16.4 mpg in my old 04 jeep,now I'm getting 17.7 mpg.. Was actually better than I was expecting.. So definitely a good purchase

Verified purchase:  Yes | Condition: new | Sold by: necycleshop

Lightweight and easy to install.

After product was installed it made a difference. Seems to run alot better than old plugs being in vehicle. I highly rate these plugs for gas milelage and power.

Verified purchase:  Yes | Condition: new | Sold by: necycleshop

Glad I made the change.

My 2004 Jeep Wrangler needed a spark plug change and the e3 seemed like the best plug replacement. Has made a middle aged Jeep perform like when it was new. Just a spark plug upgrade and it runs great.Read full review...

Verified purchase:  Yes | Condition: new | Sold by: trueblueautoparts

Great product!!!

These plugs are very well made. My Dodge Dakota was running a little rough and now it running super smooth, well worth a few extra bucks on the front end for the longevity.

Verified purchase:  Yes | Condition: new | Sold by: 1motoshop-com