There's a few things to consider before buying these plugs. They won't break off in the heads, they're a one piece plug. I don't think they weren't really intended for a stock motor, I've heard people have had trouble with them being used in a stock motor. I have a lot of upgrades on my engine, so they work great for me. Before I had my truck custom tuned for all the upgrades, long tube headers, 3 inch off-road Y pipe with no cats, and full 3 inch exhaust from the collector's back, and cold air intake, I was fouling plugs, even melting plugs, because the ECU was trying to compensate for much larger volume of air than a stock engine flowing through the intake into the combustion chamber and out the exhaust with no restrictions, no back pressure, the air fuel mixture was way off. This cause all kinds of problem, the truck run terrible, backfired, and bogged like crazy, but it really had nothing to do with the plugs. Since I got my tune, the engine has run so good. They seem to be great for my application, I probably gained 1 or 2 mpgs with them. They are great plugs.Read full review
Verified purchase: Yes | Condition: New
Great Price, truthfully you can not beat this price at Auto Zone nor Advanced Auto. It took a about 100 miles for the computer system in the vehicle to adjust to the plugs range but after that it seems to run better have more power and save a little gas. At this price you still can't go wrong.
Verified purchase: Yes | Condition: New
I am sorry I bought these plugs with out reviewing them first I found out they run terrible in the ford 5.4 v8 now I have them what do I do with them. everybody I talk to about using them in a ford they say do not use them they run good for a period them they start to misfire I do not know if you will take them back
Verified purchase: Yes | Condition: New
Second set of these plugs. First set I used for almost 100k miles with no issues. E3 guarantees them 100K or 5 years and I'm almost at 5yrs too.
Verified purchase: Yes | Condition: New
I like the e3 plugs, they deliver as stated, I just wish the quality was a little better. Electrodes are comonly not centered. But I got a great deal.
Verified purchase: Yes | Condition: New
Great spark plug nice 1 piece design, (got 8 for under $30 on eBay) These plugs run very smooth can feel pedal response on highway but did decrease my gas mileage by 1 mpg over 2 tanks would buy again
Verified purchase: Yes | Condition: New
Replaced the champion 7989 plugs with the E3.70 on a 2007 F150 5.4L 3V. Can’t wait to see what kind of performance I get with the E3.70 compared to the 7989’s. I had about 40,000 miles on the 7989 and the electrodes were worn out already and the truck was slightly misfiring (not enough to set a code) between 45-55 mph on light load.
Verified purchase: Yes | Condition: New
I had a 15% improvement in fuel consumption and a great improvement in power, I installed them as they arrived, I checked their performance with a scanner, I have been using them for more than 6 months and they continue to work well. Regarding emissions monitoring, it complies perfectly. I have them working on a 1999 Jeep Grand Cherokee limited 4.0.
Verified purchase: No
my truck runs so smooth...its like i have brand new truck
Verified purchase: Yes | Condition: New
This is the second set I’ve put in a Ford. First was a 2004 F150 5.4. Latest set went in my 2006 Explorer 4.6. No issues with either vehicle and they both ran great with the E3’s.
Verified purchase: Yes | Condition: New
Current slide {CURRENT_SLIDE} of {TOTAL_SLIDES}- Best Selling in Spark Plugs
Current slide {CURRENT_SLIDE} of {TOTAL_SLIDES}- You may also like
