E3 Spark Plugs E3.70 Premium Automotive Spark Plug with DiamondFIRE Technology for Ford Applications, 16mm, 0.860” Reach, Taper Seat, Pack of 1

Worked great on my 2005 F-150 fx4 5.4L. Better throttle response, smoother idling and quicker start ups. Now i don't have to about breaking plugs with the stronger design over stock. When i got my truck someone had already changed the motorcraft plugs to autolite plugs. But my truck felt sluggish like it was stopped up or now getting a good burn. So sea foamed the motor than put in the E3 plugs and was amazed with the more power i got. Plus the E3 have a 100,000 mile guarantee.

Really like these plugs, they are a one piece unit that will not break off into the heads on these 5.4L Triton engines. We replaced the factory plugs with these and a set of Bravex coil packs, and the truck runs so much better now. I would recommend these plugs to anyone over the pricy Autolite, Champion, or Motorcraft.

These spark plugs are in terrible shape shape after just a couple of thousand miles. Started having rough idle, loss of power, and misfires. All of them are corroded. One lost (burned out?) the central electrode. Going back to use OEM spark plugs on my F-150

I used these on my 2005 F150 with the 5.4L 3V. The truck is a nightmare to change spark plugs on. I have had these on for about three months with no problems. If you read the internet reviews, these spark plugs don't fare well on Ford trucks but I have yet to notice any of the problems listed.

I received these plugs and was excited! I ordered them last year end of May 2012. I installed them near the end Jul 2013. When installing I realized I had one bent plug(serves me right for not checking the packages before storing). It would have cost me more to send back with the shipping and everything then to buy a new one(so I did order a new one). However, the plugs work AWESOME (yeeaaahh(say it like lil john))! In the end I just order a new one from Amazon.com.

Had a problem with yerking on low rpm. Replace plugs with E3's and my truck is running great and smooth again. Only drawback is that plugs needs a different size socket than the OE plugs, which makes it kinda difficult with this engine where you need a special plug removal socket to reach them. However, did manage to do them with standard socket and extention.

I don't know should this one star should be for Amazon or E3sparkplugs??Amazon fit engine showed they would fit my 2012 ford expedition (5.4L). I bought them, They don't fit.Amazon should modify their fit engine on their website with sensitive equipment to determine the fitness of certain stuff on certain model.I should have contacted E3 spark plugs technical support before making the purchase. I don't know how to ship them back, they will cost me almost double the price.Update;Thanks Amazon for refunding me. I would give it 5 stars, amazon was so cooperative.

Sent 7 new ones and 4 used ones...