Reviews for E-3 E3.58 Diamond Fire Spark Plug for Chrysler, Dodge & Jeep Vehicles
excellent spark plugs.
I certainly felt a huge power boost, but that's more likely from the fact that all of my old spark plugs were welll past their lifetime.
I really noticed a difference, especially in 2nd gear.
Questionable Ive not seen any gain to using these plugs.
Caused emissions failure on my 2000 TJ. Chased O2 HTR and another for two months and hundreds of dollars. Replaced every sensor on the TJ as well as coil pack. Finally found an Autolite replacement and immediately corrected issues for $25.
Mine may have been an anomaly but if you have similar issues, stare with plugs.
I installed the plugs in my 2001 XJ and it ran so rough it was back firing. I took them out and put the old ones back in and it ran fine so I'm sending them back.
The plugs made the engine run rough