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At 55,000 it started giving P0300 codes, Multiple Cylinder Misfires.
I don't know if this is a design or manufacturing problem, but please save yourself the frustration I've experienced and don't buy these plugs.
In the end, they refused to send me out 3 replacements but said I could simply reorder the plugs.
Got the free shipping but got 7 champions and a NGK which is not a problem if the guy will send me another champion plugPublished 1 month ago by Forrest Allen
Two of eight plugs failed in less than 50 miles. Insulators come apart and then slide down over electrode. This prevents a full spark from igniting. Read morePublished 1 month ago by Sonny B.
Save yourself some grief, buy a different set of manufactures plugs for your 5.4 3v engine. These plugs cost me money and time, I bought another set of coils hoping it would fix my... Read morePublished 2 months ago by Robert J. Boahbedason
worked like a charm, once we got the old 2 piece ones out...Published 2 months ago by christina m. french
This is the second time I have bought these plugs. The first round, I replaced all 8 factory plugs with these, and no problems for 85k miles. Read morePublished 2 months ago by sarinerah
Have worked great, highly pleased with them. The way I replaced them was left the truck off for a day, removed the coils off each plug, vacuumed and blew air in each spot, sprayed... Read morePublished 5 months ago by erik rocha
I bought a set of 8 of these plugs 6 months ago and I have had 2 completely fail in that amount of time. Read morePublished 6 months ago by Mark A Hicks
Bought these plugs to replace the factor plugs on my 2004 Ford F150 FX4 5.4 Titan V8. Had the plugs in less than a year when the engine light came on and the truck wanted to stall. Read morePublished 7 months ago by max
I decided to do my spark plug change myself, as I bought this truck used and the plugs have never been changed to my knowledge. I am fully aware of the breakage in the 5. Read morePublished 9 months ago by Cody Jarrett