Ignition Coil + Spark Plugs for Ford Excursion (2000-2005) 6.8L

Direct-Fit Ignition Coil and Spark Plug Kit for 2000-2005 Ford Excursion (U137)

What it Does: The Ignition Coil and Spark Plug Kit restores factory combustion efficiency and resolves secondary ignition misfires on the 2000-2005 Ford Excursion under heavy towing and high-load operating conditions.

The Stock Ford Excursion Ignition Breakdown

Deep cylinder head wells and sustained thermal cycling in the heavy-duty U137 platform promote rapid dielectric breakdown of factory ignition boots. The 2-valve 6.8L Triton V10 operates under intense engine bay thermal loads, hardening the OEM silicone sleeves and enabling secondary voltage to arc directly into the aluminum plug wells rather than jumping the plug gap. Concurrently, internal copper winding fatigue and thermal potting degradation cause inter-turn shorting in aging factory coils, leading to stumbling under acceleration, misfire trouble codes (P0300-P0310), and poor fuel economy under trailer-towing load.

The Engineering Solution

This full-service direct-fit replacement package restores complete spark energy delivery. Each coil-on-plug unit features high-dielectric epoxy vacuum potting and high-temperature silicone boots that resist thermal hardening and prevent spark blowout under load. Matched with heavy-duty NGK spark plugs engineered for stable flame kernel propagation, this kit maintains an uninterrupted 30,000+ volt secondary circuit. Built directly to interchange specifications for OEM part numbers DG508 and FD503, the connector interfaces seat securely to the factory engine harness without requiring wire modifications or bracket alteration.

What's Included

• 10 x Direct-Fit Ignition Coils
• 10 x NGK Spark Plugs

Technical Specifications

Compatibility

• 2000-2005 Ford Excursion 6.8L V10 (2-Valve SOHC Modular)

Frequently Asked Questions & Fitment Warnings

Does this fit the U137 Excursion?

Yes, this is a direct fit for the 2000-2005 Ford Excursion equipped with the 6.8L Triton V10 engine. It does not fit diesel models (7.3L or 6.0L Power Stroke) or 5.4L V8 applications requiring alternate boot angles.

Are spark plug wires required for this installation?

No, this platform uses an independent Coil-on-Plug (COP) configuration with one dedicated coil and one plug per cylinder; spark plug wires are not utilized.

The Ford Towing Standard

For the full-size U137 platform hauling heavy payloads, balanced combustion across all 10 cylinders is critical. Renewing coils and spark plugs simultaneously guarantees balanced cylinder pressures, eliminates unburned hydrocarbon blow-by into catalytic converters, and preserves peak towing output under extreme loads.