e3 Spark Plugs e3 Spark Plugs Reviews, Ratings, Specs & Prices
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e3 Spark Plugs e3 Spark Plugs

Email This Bookmark Print This Review      Find On: JCWhitney.com | eBay.com

Product Information

Average Price: $26.97
Manufacturer: e3 Spark Plugs
Yes: 9 / No: 8

e3 spark plugs part number E3.58

"DiamondFire technology is the result of an intensive series of laboratory experiments that measured the power created by a spark plug. For the most accurate measurement of power…" (e3 website)
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Registered User
Brad120's Reviews
04-16-2014, 06:59 PM
Price: $10.00
Pros: Optimized firing, fires a Plasma style pattern versus conventional 'arc'.
Cons: At approximately 10 bucks each and 16 each required for the Hemi it gets pretty expensive for plugs.
Recommended? Yes

Comments: Replaced factory plugs with E3's have ran these in Harley Davidson's with impressive results. Did notice an improvement over stock plugs, improved mileage slightly, approximately 1.5 mpg. Engine felt more responsive. This is in a 5.7L Hemi. Gains were more noticeable in Harleys since you're only working with 2 cylinders and less hp than the Hemi. I've owned a bike shop and have raced cars and I've tried just about every plug made and my two preferences are: #1 E3, #2 Autolite. These are choices based on my experiences, I'm sure everyone has their favorites.

Registered User
ganoze's Reviews

01-04-2014, 10:29 PM
Price: $37.00
Pros: None
Cons: Annoying misfire and engine miss after 3000 mi.
Recommended? No

Comments: Installed on '94 4.0 H.O. worked well at first (quick startup, better throttle response, and fuel mileage), then caused misfiring. Used champion coppers before e3's, now using autolite coppers no more misfire/missing. Same cap/rotor and wires before and after e3 plugs.

Registered User
metaXJ's Reviews

03-27-2013, 11:39 PM
Price: $38.00
Pros: helped smooth out rough idle...for 50 miles...
Cons: only lasted 50 miles before worse misfires then my 98,000 mile old burnt Champion plugs.
Recommended? No

Comments: i bought these thinking i could help increase a little HP and get maybe 1-2mpg better then the 13mpg im getting now with my 00' XJ 4.0L

If you have a 4.0L DO NOT BUY THESE PLUGS. spend $38 on a set, my 208,xxx mile XJ ran better with the worn out Champ plugs then these over priced gimmick.

Registered User
CJMSFT's Reviews
02-23-2013, 11:56 PM
Price: $50.00
Pros: Pre gapped
Cons: Don't see a difference between this and champions except $20 in the pisser=(
Recommended? No

Comments: dot dot dot

Registered User
OregonUSA52LV8's Reviews
08-07-2012, 12:37 AM
Price: $5.99
Pros: 10,000 mile warrant. Easy to install. Already GAPPED.
Cons: Expensive. Not held by every store.
Recommended? Yes

Comments: 10,000 mile warrant. Easy to install. Already GAPPED, which is awesome. They are expensive but they will last and I have heard good reviews as well.

Registered User
goolsbayjeep's Reviews

12-24-2011, 10:40 PM
Price: $8.69
Pros: increased HP and fuel economy
Cons: a little pricey
Recommended? Yes

Comments: These plugs are a little pricey but so worth it! I put 6 in my 2001 cherokee. I get 2 more MPG and alot more power. I never thought I could have done a 20 foot burn out in my jeep. I used to have to hold the key in the start position for about 5 seconds in the cold but now it starts right up

Registered User
04BlackLJ's Reviews
08-29-2011, 09:49 PM
Price: $6.99
Pros: Great Performance
Cons: $6.99 Each, Pricey all together
Recommended? Yes

Comments: They're just plugs but when upgrading don't forget these

Registered User
Joes4x4ZJ's Reviews
05-09-2011, 06:07 PM
Price: $25.00
Pros: starts great
Cons: no problems
Recommended? Yes

Comments: works well

Registered User
urbancrawler's Reviews

03-02-2011, 11:11 PM
Price: $36.99
Pros: More MPG
Cons: Can't gap, don't last
Recommended? No

Comments: Did not see great gas milage increase and then at 3,000 miles I started to get an intermittent misfire then the porcelain in the plug cracked. Switched to NGK V-Power and never looked back. It idles smooth as glass now and has the same MPG and the same power if not more.


Registered User
Kitchen's Reviews
12-25-2010, 09:00 PM
Price: $35.00
Pros: Everything
Cons: None
Recommended? Yes

Comments: Ive seen a better power gain out of these sparkplugs than i saw in my K&N and my Flowmaster

Registered User
goose5's Reviews
09-19-2010, 07:54 PM
Price: $7.95
Pros: More power, better fuel economy
Cons: Pricey... made in china.
Recommended? Yes

Comments: Plugs seem high quality although they are made in china. Once installed they proved themselves quite quickly. More power, and better fuel economy right away.


Registered User
Unlimitedlou's Reviews

05-17-2010, 03:54 PM
Price: $42.00
Pros: None
Cons: High price, poor quality
Recommended? No

Comments: I ended up with 2 cracked ceramics within a couple of weeks.


Registered User
Cuder's Reviews

03-06-2010, 03:03 PM
Price: $42.00
Pros: NONE
Cons: They suck, started getting cyclinder missfire code after 20,000 miles.
Recommended? No

Comments: I have a 2000 TJ with the 4.0. I wish I had known about this site before I bought these. The engine started idleing rough and cutting out after 20,000 miles. Put in the Autolites APP985 and now it runs like new again.

Registered User
KTM_Justin's Reviews
01-15-2010, 10:26 PM
Price: $40.00
Pros: 100,000 mile (or 5 year) warranty
Cons: One plug melted after 3000 miles and caused my Jeep to misfire and die at idle randomly. One melted and the other 5 burnt pretty bad.
Recommended? No

Comments: Installed with a stage II JET chip and running 89 octane. I had a bad experience with them. DO NOT recommend them for a 4.0L with motor mods and higher octane. I burned one out in under 3000 miles.

*Prefer the Champion plugs.

Registered User
jbozz17's Reviews
10-23-2009, 06:05 PM
Price: $7.00
Pros: Starts
Cons: Runs
Recommended? Yes

Comments: Starts and runs nicely. idle is strong and you can feel more power

Registered User
09-23-2009, 10:28 PM
Price: $30.00
Pros: increase mpg increase hp
Cons: none
Recommended? No

Comments: when i bought the jeep i was getting 18 mpg in the city after the install of the g3 plugs my mileage increased to 22 mpg and the motor is more respondsive
edit: they wear out fast and cause misfires and poor mpg and power

Registered User
98cherokee19's Reviews
09-10-2009, 08:51 PM
Price: $35.95
Pros: works great havent gotten a chance to drive yet, but starts right up
Cons: none
Recommended? Yes

Comments: make sure you dont mess up the firing order >.

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