MASIgnition Coils DG521 and Motorcraft SP-509 Spark Plugs compatible with Ford Expedition F-150 Super Duty F-250 F-350 F-450 F-550 F-350 F53 4.6L 5.4L 6.8L C1659 DG521 8L3Z-12029-A

Installed and fixed my misfire! Great price and good quality! Note: coils aren't OEM but are decent quality!

Muy bueno cumplió míos espectativa

I gave the MAS Ignition Coil Set a chance to repair some coils that went out on my 2013 Expedition EL because they looked like they would fit and had a healthy 4-star review. The good part of the set is that they're a direct fit for OEM.There are major bad parts about this set though. First, the boots are slightly too large in diameter--while this gives a very good seal in the spark plug well, it makes them difficult to remove. Second, they're lighter and louder than OEM. That may be a non-issue, but you definitely hear the clicking of the coils every time it sparks. Last, the SP-509s are fake. The engraving is etched, not stamped; the numbering is centered on the hex flats instead of near the edge; and the blue printing can be scraped off by a fingernail. The spark plug boxes look legit though--very good job of a fake product. Too bad I didn't realize this until after the return period.What does this do? Well, I assume the parts are failing slowly in the engine, and my usual 15/16 mpg has fallen to 12/13 consistently over 2 months. I think I'm going to take them out and get the real parts before something explodes in my engine. Save your money and get some OEM parts.

So far so good, had them installed on my 2008 Ford Expedition 5.4L. It’s been about a week, and they’re working great. They came quickly and as described. Excellent value. I will update review if they don’t last. 5 stars.

I just bought this July 19th and already have a misfire and it was done professionally. The ignition coil was swapped to other pistons and the problem followed. Thankfully the company reached out to me and sent me new ones and it has a 1 year warranty to cover their product.