ultramindz Ignition Coils & Spark Plugs Kit for Ford 4.6L/5.4L V8 — 8 Coils + 8 Plugs, Direct-Fit DG521/FD509

ultramindz ignition coils and spark plugs kit supplies eight direct-fit coils and eight spark plugs engineered to replace OEM DG521/FD509 units on Ford 4.6L and 5.4L V8 engines from 2008–2014.

This complete ignition pack is built for drivers and mechanics who need a reliable, one-stop replacement for worn or failing ignition components on compatible Ford, Lincoln and Mercury models. It groups 8 ignition coils and 8 spark plugs matched to factory electrical and physical fitment specifications, helping restore consistent spark delivery across all cylinders. Before ordering, confirm the coil boot color (some 2008 vehicles use brown boots) and verify compatibility with your engine’s OEM part numbers listed below.

Which vehicles and engines will this kit fit?

The kit targets 4.6L and 5.4L Ford V8 platforms produced in model years shown. It covers a broad range of pickups, SUVs and performance cars from the late 2000s to early 2010s when those OEM coil designs were used. Always compare the OEM reference numbers on your existing coils and plugs to the replacements.

• Ford F-150: 4.6L (2009–2010) and 5.4L (2008–2010)
• Ford Super Duty F-250/F-350 5.4L (2008–2010); Expedition 5.4L (2009–2014)
• Explorer/Explorer Sport Trac 4.6L (2008–2010); Mustang GT 4.6L (2008–2010)
• Lincoln Navigator 5.4L (2008–2014); Mercury Mountaineer 4.6L (2008–2010)

What OEM numbers and part references does this replacement match?

Compatibility is based on OEM reference numbers so you can confirm fit before purchase. The ignition coils and plugs in this kit are manufactured to align with those factory references, making them suitable for direct replacement in vehicles that used the listed part codes.

• Coil references: DG521, FD509, 8L3Z12029A, 8L3Z-12029-A, 8L3E12A366AA
• Spark plug references: HJFS-24FP-X, HJFS-24FP, SP509, SP509X
• Package contents: 8 ignition coils + 8 spark plugs

How do these parts help the vehicle run better after replacement?

Replacing old or failing coils and plugs helps re-establish consistent spark timing and energy to each cylinder, which reduces misfires, rough idle, and hard starts associated with degraded ignition components. While results vary by vehicle condition, installing a matched set across all cylinders ensures uniform performance and avoids mismatched outputs.

• Restores even spark delivery to all eight cylinders
• Reduces misfires and improves idle smoothness when ignition parts are worn
• Full-kit approach avoids cylinder imbalance from mixing old and new coils

What should I know about installation and compatibility details?

Installation requires basic mechanical access to the engine’s ignition coil packs and spark plug wells. Because spark plug gap and torque specifications matter, professional or experienced DIY installation is recommended to prevent damage and ensure safe, reliable fitment.

• Confirm coil boot color for 2008 vehicles (brown boots possible)
• Use manufacturer torque specs and correct spark plug gap if applicable
• Professional installation is recommended to avoid improper installation risks

Who this kit is for: Drivers, fleet operators and mechanics who service late-2000s to early-2010s Ford 4.6L/5.4L V8 engines and need a matched, full-cylinder replacement. Choose this ultramindz kit when you want a complete set of ignition coils and plugs to restore consistent spark performance across the engine, and be sure to check OEM reference numbers and coil boot color before purchase to confirm fit.