Important Corrections to the Original Listing
SP479 Is Not an Iridium Plug
The original description calls SP479 an iridium spark plug. Motorcraft SP479/AGSF22WM is generally identified as a platinum spark plug, not an iridium plug.
The product title and description should therefore say:
DG508 Ignition Coil Pack and Platinum Spark Plug SP479 Set
Advertising it as iridium creates a material specification error—not exactly the exciting kind of spark customers are looking for.
Lincoln Navigator Fitment Is Overstated
The supplied listing claims compatibility with the 1998–2011 Lincoln Navigator 5.4L. That range should not be published.
DG508 application data supports early Navigator applications around 1998–1999, while later Navigators used different four-valve and three-valve versions of the 5.4L engine. The 2011 Navigator specifically used a 5.4L three-valve V8, not the early two-valve configuration targeted by this kit. Part Information
Later F-150 Models Require Engine Verification
The 2009–2010 F-150 was available with both:
- 4.6L two-valve V8
- 4.6L three-valve V8
- 5.4L three-valve V8
This kit should only be sold for a vehicle whose original coils and plugs match the listed references. Ford documentation confirms that two different 4.6L valvetrain configurations were offered during this period. Ford-Trucks.com
Transmission type can help identify them on many 2009–2010 trucks: the two-valve 4.6L was generally paired with the four-speed automatic, while the three-valve version used the six-speed. Still, confirm by VIN rather than treating the transmission as a legally binding confession.
Replacement Numbers
Ignition coils
- DG508
- FD503
- DG467
- DG473
- DG481
- DG491
- F523
- 88921369
- 1L2U-12029-AA
- 1L2Z-12029-AA
- 1L2Z-12029-AC
- 2W7Z-12029-AA
- 3W7Z-12029-AA
- F7TU-12A336-CB
- F7TU-12A366-AB
- F7TU-12A366-BA
- F7TZ-12029-AB
- F7TZ-12029-BA
- F7TZ-12029-CA
- F7TZ-12029-CB
Spark plugs
- SP479
- SP493
- AGSF22WM
- AGSF22WMF4
- AWSF22E
Confirm the actual plug number included with the kit. SP479 and SP493 should not be treated as universally interchangeable across every listed engine without an application lookup.
Symptoms This Kit May Correct
A correctly matched coil-and-plug set may help address:
- Rough or unstable idle
- Hesitation under acceleration
- Hard starting
- Reduced engine power
- P0300 random or multiple-cylinder misfire
- P0301 through P0308 cylinder-specific misfires
- Ignition-coil circuit codes
- Flashing check-engine light
- Fuel odor caused by an active misfire
Read our engine-misfire diagnosis guide before ordering. A misfire code identifies uneven combustion; it doesn’t automatically prove that every ignition coil needs replacement.
Installation Notes
Before installation:
- Confirm the vehicle’s VIN and engine configuration.
- Match the original coil and spark-plug numbers.
- Allow the engine to cool completely.
- Clean debris from around the spark-plug wells.
- Inspect each well for oil or water contamination.
- Compare the new plug’s thread, reach and seat with the old plug.
- Check the gap even if the plugs are advertised as pre-gapped.
- Start every spark plug by hand.
- Tighten the plugs to the specification for the exact engine.
- Inspect coil connectors for broken locks, corrosion or damaged wiring.
- Clear stored codes and verify the repair.
Do not blindly apply one torque specification across every 4.6L and 5.4L engine. Ford changed cylinder heads and plug designs during the Modular engine’s long production run.
NGK recommends checking the gap for the specific engine application even when a plug arrives pre-gapped. Review its spark-plug gap guidance before installation.
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