Why should you replace all 8 ignition coils at once?
This is the most common question Ford V8 owners ask when they get an ignition failure code. Here's the honest answer:
All 8 coils are the same age and have the same mileage; if one fails, the others will soon fail as well.
Replacing one coil now and then replacing 7 more coils later is far more expensive in terms of labor time.
A single faulty coil puts extra strain on the remaining coils, accelerating their failure.
Replacing all 8 coils ensures balanced ignition performance in every cylinder.
For engines over 80,000 miles, a complete coil set replacement is standard practice at Ford dealerships.
The calculation is simple: looking under the hood once now saves you from having to look 7 more times later.
What makes the Motorcraft DG-508 the right coil?
The only ignition coil recommended by Ford Motor Company for 4.6L and 5.4L Triton V8 engines
Coil-spark plug design — no wires, no adapters, can be plugged directly into any spark plug
Steel lamination stack for consistent magnetic field and reliable high-voltage spark output
Premium materials designed for maximum performance and long service life
Motorcraft 2-year / unlimited mileage warranty — valid at any Ford or Lincoln dealership
Vehicle compatibility — complete 8 coil set
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 Touring 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 all 8 DG-508 coils — step by step
- Disconnect the negative battery terminal before starting
- Remove the engine cover if your vehicle has one
- Working one cylinder at a time, unplug the electrical connector from the 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 fully
- Reinstall the bolt and reconnect the electrical connector
- Repeat for all 8 cylinders
- Reconnect the battery, clear any misfire codes, and test drive
Total time: 1.5–3 hours depending on your engine and experience level. Cylinders 4 and 8 at the back of the engine are the tightest — extensions and swivel joints make them much easier.
Why buy from SayParts?
- 8 x Genuine Motorcraft DG-508 coils with 2-year / unlimited mile Ford warranty
- Free installation video covering all 8 coils
- Free worldwide shipping
- Save $311 vs buying 8 singles at AutoZone ($88.99 each)
Don't do the job twice. Replace all 8 Motorcraft DG-508 ignition coils at once and restore full performance to your Ford 4.6L or 5.4L V8.
👉 Order the Motorcraft DG-508 8-Pack at SayParts: https://sayparts.com/products/motorcraft-dg-508-ignition-coil-8-pack-ford-4-6l-5-4l-v8
👉 Need just 1 coil? Order single DG-508 here: https://sayparts.com/products/motorcraft-dg-508-ignition-coil-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.