DETYI Ignition Coil Pack & Iridium Spark Plug Kit, 8-Coil/8-Plug Direct-Fit for Ford 4.6L/5.4L

DETYI's DG508 ignition coil pack and SP479 iridium spark plug kit is a complete eight-coil, eight-plug ignition tune-up designed to restore reliable spark and smoother performance for compatible Ford, Lincoln, and Mercury V8 engines.

This all-in-one set pairs eight DG508 high‑heat ignition coils with eight SP479 iridium spark plugs so you can replace the entire ignition bank in one service. Engineered as direct replacements for many Ford 4.6L and 5.4L V8 applications, the combo eliminates gradual power loss from worn coils and plugs and reduces the need for multiple part numbers during maintenance. Each spark plug comes pre-gapped and each coil features reinforced insulation, cutting down installation time while improving long-term durability.

Which vehicles and engines will this kit fit?

This kit is built to match a broad range of Ford, Lincoln and Mercury vehicles that use the DG508-style coils and SP479 plug. Fitment covers select 4.6L and 5.4L V8 engines across trucks, vans, SUVs and performance models from the late 1990s through the mid 2010s.

• Selected Ford F-150, F-250, F-350 years and engine sizes (4.6L & 5.4L).
• Multiple Econoline vans and E-Series models (E-150/E-250/E-350, Excursion).
• Passenger cars and SUVs like Mustang, Crown Victoria, Expedition, Navigator, Mountaineer.
• See parts interchange list for replaced OEM numbers (e.g., 1L2Z12029AA, F7TU12A336CB, SP479).

How does upgrading to DG508 coils and SP479 iridium plugs improve performance?

Replacing worn coils and plugs with matched components restores ignition consistency and can reduce misfires, rough idling and inefficient combustion. Iridium tips require less voltage to fire and resist erosion, while the coils are built to tolerate heat and vibration common to V8 installations.

• Smoother throttle response and more consistent starting under load.
• Reduced misfire incidents and more complete fuel burn.
• Improved long-term reliability thanks to iridium electrodes and heat-resistant coil housing.
• Full-bank replacement prevents uneven cylinder performance from mixed-age parts.

Is installation difficult and what comes ready-to-use?

The kit is intended as a direct-fit replacement so no fabrication or special tools are required beyond standard hand tools. Each spark plug is pre-gapped and coils are molded to OEM-style boots for a secure fit, making the swap faster for DIY mechanics and professional technicians alike.

• Pre-gapped SP479 iridium plugs ready for immediate installation.
• Coils with OE-style connectors and insulating boots for snug seating.
• Standard hand tools suffice; torque to vehicle manufacturer specs.
• Replace all eight coils and plugs together to avoid cylinder imbalance.

What durability and quality features should I expect from this set?

Both components are designed for endurance in high‑temperature V8 environments: coils use reinforced insulation to avoid cracking, and iridium spark plugs keep a stable spark longer than conventional plugs. The combination aims to extend service intervals and maintain stable ignition over time.

• Heat-resistant coil construction minimizes failure from thermal cycling.
• Iridium electrodes offer greater wear resistance than copper or platinum.
• Stable spark performance under heavy load and variable conditions.
• Comprehensive part number cross-references for straightforward replacements.

Who is this for: The DETYI DG508 & SP479 kit is ideal for owners and technicians working on Ford-family V8 vehicles seeking a cost-effective full-bank ignition refresh. If you own a compatible F-150, Super Duty, Mustang, Expedition, Navigator, Crown Victoria, or Econoline/E-Series vehicle and want a matched set that reduces installation time while improving ignition reliability, this eight-coil, eight-plug package is designed for your next tune-up.