MAS Set of 8 Ignition Coils Brown boots DG521 and Motorcraft SP-509 Spark Plugs Compatible with Ford Expedition F-150 Super Duty F-250 F-350 F-450 F-550 F53 4.6L 5.4L C1659 DG521

These plugs and coils have worked without a problem for more than 2 years. Very happy with them. Gas mileage improved by 2 miles per gallon

I got my first order but the Coils were completely mission just spark plugs, I asked Amazon and they sent a replacement Quick and the replacement worked perfectly and everything in the kit showed up.

Still had issues after installing. I ended up changing out fuel injectors on 3 cylinders and the 02 sensors unnecessarily because they were the issue from the gate. My mechanic told me that they were dead and the reason the engine was rougher after I changed everything was that I went from bad to worse! I usually have no issues with Motorcraft, but this was an expensive nightmare!

Very good muy bueno

They fit perfectly.

Initially ordered and when the package came it was missing the spark plugs. They had to resend the item and I had to return the last delivery. Long story short the one that came was in a different package and packaged way different than the first time. The product worked as it should though just annoying to go through the extra step. Good quality and easy to install .

I couldn't believe the prices at the the other over the counter and online stores. Plugs going for $8 to $12 dollars a piece and coils costing $40 to $90 each. When I saw the Amazon listing for less than half what the others were charging I figured they were going to be cheap knockoffs. I though they would show up in a baggie wrapped in Chinese newspaper. All I can say is WOW! Great presentation. So then I thought it's probably lipstick on a pig. Wrong again! The plugs are original or sure. Not damaged and all were gapped correctly. The coils all ohmed correctly and were identical to the factory coils that I was replacing. I've done about 2000 miles and not a miss. I still can't figure out why there is such a price difference. For now, I am extremely satisfied.

Ignition Coils DG521 and Motorcraft spark plugs review:I installed these after discovering that one of the cylinders in my 2009 F-150 (5.4 V8 Triton) wasn't firing. The installation was fairly easy (it took about an hour at a leisurely pace), and it fixed the misfire issue immediately (as expected).However, within 6 months of replacing the plugs and coils, my transmission coolant lines broke precisely where they are known to fail. Clearly, the mechanic who worked on the truck broke them for job security. So just be warned - if your engine misfires, don't hire me to fix it!