Motorcraft DG520 Ignition Coils & SP520 Spark Plugs – Set of 6 | OEM Ford Replacement
Motorcraft DG520 Ignition Coils & SP520 Spark Plugs – Set of 6 | OEM Ford Replacement
Get maximum performance and reliability with the Motorcraft DG520 Ignition Coil & SP520 Spark Plug Set (6 Coils + 6 Plugs). Designed by Ford Motorcraft, this OEM replacement kit ensures strong ignition, smooth engine operation, and long-lasting durability. Perfect for restoring factory performance in your Ford or Lincoln vehicle.
Features & Benefits
- ✅ Genuine Motorcraft OEM ignition coils & spark plugs
- ✅ Complete set for a full ignition system tune-up
- ✅ Ensures reliable starts, smoother acceleration, and improved fuel economy
- ✅ Built to Ford specifications for exact fit & durability
- ✅ Resistant to misfires, wear, and heat damage
Vehicle Compatibility
This Motorcraft DG520 & SP520 set fits many Ford and Lincoln vehicles, including but not limited to:
- Ford F-150 (4.6L / 5.4L Triton V8)
- Ford Expedition, Explorer, E-Series (select engines)
- Lincoln Navigator, Mark LT
(Confirm fitment with your vehicle owner’s manual or OEM part number.)
Cross Reference
- DG520 replaces: 5C1584, C1541, 601000, IC508
- SP520 replaces: CYFS12Y-2, PZH14F, 12405
(Cross references are provided for guidance only. Verify before ordering.)
What’s Included
- 6 × Genuine Motorcraft DG520 Ignition Coils
- 6 × Genuine Motorcraft SP520 Spark Plugs
Why Buy From Us
- 🔧 100% Authentic Motorcraft Products
- 🚙 OEM Fitment for Ford & Lincoln Vehicles
- 🚀 Fast USA Shipping & Easy Returns
- ✅ Trusted Auto Parts Supplier
❓ FAQ
Q: Which specific engine platforms and cylinder configurations is this DG520/SP520 ignition set designed for?
A: This set is a specialized tune-up kit for Ford’s modular engine family. It is critical to note that while the listing mentions F-150s, the DG520/SP520 combination is specifically engineered for the 4.6L and 5.4L 3-Valve Triton engines. These engines are notorious for their unique "two-piece" spark plug design. This kit provides the updated Motorcraft SP520 plug, which is the official factory-redesigned one-piece spark plug that fixes the notorious issue of the old plugs snapping off in the cylinder head during removal.
Q: What are the warning signs that my ignition coils (DG520) are failing?
A: Ignition coils convert the low-voltage electricity from your battery into the massive high-voltage spark required to ignite your fuel. Signs of failure include:
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Engine Stumble/Hesitation: You feel a rhythmic jerk or "hiccup" when lightly accelerating, especially when the engine is under load.
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Engine Misfires: A shaky idle or a feeling that the engine is "down on power" or running on fewer than its total cylinders.
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Check Engine Light: The ECU will trigger codes P0300 (random misfire) or specific codes P0301 through P0308, indicating which cylinder's coil has failed.
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Poor Fuel Economy: A failing coil causes incomplete combustion, forcing the engine to work harder and burn more fuel to maintain speed.
Q: What are the exact step-by-step instructions for replacing these components, and how do I avoid the famous 3-Valve spark plug breakage issue?
A: The 3-Valve Triton engine is famous for plugs that seize in the cylinder head. Never attempt to remove these plugs on a warm engine.
This is the most important step: The engine must be completely cold. Many technicians recommend spraying a high-quality penetrating oil into the spark plug wells and letting it soak for several hours or overnight before attempting removal. This helps the oil seep down the long threads and the extended electrode shield, which is where the plugs usually seize.
Disconnect the electrical wiring harness from each DG520 coil pack. Unscrew the small retaining bolt and gently pull the coil pack straight up and out of the well. Inspect the rubber boot for signs of "carbon tracking" (black lines running down the side), which is a clear indicator that the coil has been arching to the side of the cylinder head.
Using a 5/8-inch spark plug socket, apply force to break the plug loose. If you feel extreme resistance, stop. Use a "wiggle" technique—turn the plug slightly counterclockwise, then turn it back clockwise, then counterclockwise again. This "back-and-forth" motion helps break the carbon deposits on the plug shield without snapping the metal. If a plug snaps, you will require a specialized "extraction tool" specifically for this engine.
Take your new SP520 one-piece plugs. Apply a very light, thin coating of nickel-based anti-seize specifically to the smooth metal shield portion of the plug (not the threads). This prevents the shield from bonding to the cylinder head in the future. Thread the new plug into the head by hand to ensure they seat correctly, then torque them to 25 lb-ft (34 N·m).
Before installing the new DG520 coils, apply a small pea-sized amount of dielectric grease inside the bottom of the rubber boot. This prevents moisture from entering the spark plug well and stops the rubber from fusing to the ceramic spark plug. Slide the new coil into place, push it firmly until it seats on the plug, and tighten the 7mm retaining bolt.
Reconnect all wiring harnesses. Start the engine and listen for a smooth, consistent idle. Since these engines are sensitive to ignition timing, use an OBD-II scanner to clear any old misfire codes from the ECU memory. Take the vehicle for a test drive, ensuring there is no hesitation or "stuttering" during light acceleration.