What is a DG-508 ignition coil?
The Motorcraft DG-508 is a direct-mounted ignition coil designed specifically for Ford 4.6L and 5.4L Triton V8 engines. Unlike older distributor-type ignition systems, the DG-508 sits directly on each spark plug (one coil per cylinder) and ignites that cylinder with a high-voltage spark whenever it needs to.
When a DG-508 coil fails, that cylinder stops firing properly. The result is an ignition failure, and if you receive the P0301-P0308 code, this number tells you exactly which cylinder's coil has failed.
Symptoms of a faulty ignition coil
Engine malfunction light illuminates with ignition fault codes P0300–P0308
Irregular idling or engine shaking
Hesitation or wobbling during acceleration
Low fuel consumption
Engine misfiring under load or at highway speeds
Difficulty starting in cold weather
Why the original Motorcraft DG-508?
The only ignition coil recommended by Ford Motor Company for your engine
Steel lamination stack for consistent magnetic field and reliable spark output
Premium materials designed for maximum performance and durability
Direct-to-spark plug coil design — no wiring, no adapters, direct replacement
Motorcraft 2-year/unlimited mileage warranty — valid at any Ford or Lincoln dealership
Includes all innovations or improvements developed since your vehicle's manufacture
Vehicle compatibility
DG-508 fits the following vehicles (one coil per cylinder — 8 coils total for V8 engines):
1997–2008 Ford F-150 4.6L and 5.4L V8
1999–2007 Ford F-250/F-350 Super Duty 4.6L and 5.4L V8
1997–2014 Ford Expedition 4.6L and 5.4L V8
1999–2004 Ford Mustang GT 4.6L V8
1997–2011 Ford E-150/E-250/E-350 4.6L and 5.4L V8
2003–2005 Ford Excursion 5.4L V8
1998–2011 Lincoln Navigator 5.4L V8
2002–2008 Mercury Grand Marquis 4.6L V8
2002–2011 Ford Crown Victoria 4.6L V8
Cross-references: DG457, DG472, DG491, FD-493, FD-503, FD-507, 3W7Z-12029-AA
How to replace it — under 15 minutes per coil
- Identify the misfiring cylinder from the diagnostic code (P0301 = cylinder 1, P0302 = cylinder 2, etc.)
- Disconnect the negative battery terminal
- Remove the engine cover if present
- Unplug the electrical connector from the old coil
- Remove the coil retaining bolt (7mm or 8mm)
- Pull the old coil straight up off the spark plug
- Push the new DG-508 firmly down onto the spark plug until it seats
- Reinstall the bolt and reconnect the electrical connector
- Clear the misfire code and test drive
Why buy from SayParts?
- Genuine Motorcraft DG-508 with 2-year / unlimited mile Ford warranty
- Free installation video with every order
- Free worldwide shipping
- Save vs AutoZone — $59.99 vs $88.99
Don't let a failed ignition coil leave you stranded. The Motorcraft DG-508 is the correct OEM fix for Ford 4.6L and 5.4L V8 misfires — and it installs in under 15 minutes.
👉 Order the Motorcraft DG-508 at SayParts: https://sayparts.com/products/motorcraft-dg-508-ignition-coil-ford-4-6l-5-4l-v8
👉 Need all 8? Order the DG-508 8-Pack: https://sayparts.com/products/motorcraft-dg-508-ignition-coil-8-pack-ford-4-6l-5-4l-v8
Fits 1997–2014 Ford F-150, F-250, F-350, Expedition, Mustang, E-Series, Excursion, Crown Victoria, Lincoln Navigator & Mercury Grand Marquis with 4.6L or 5.4L V8. Verify fitment with your VIN before ordering.