Ignition Coil and Iridium Spark Plugs for Ford F-250 (1997-1999) 4.6L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 1997-1999 Ford F-250

Primary Function: Restores factory secondary ignition output and combustion stability across all eight cylinders to resolve primary misfires, rough idle, and spark blowout under load.

The Stock F-250 Secondary Ignition Degradation

The factory coil-on-plug assemblies on the 4.6L Modular V8 endure severe thermal cycling in deep cylinder head plug wells. Over time, engine heat soak degrades the internal epoxy potting and winding insulation, leading to dielectric breakdown, high-voltage leakage, and misfire codes (P0301-P0308). Concurrently, traditional standard plugs suffer rapid electrode erosion, widening gap clearance and placing excessive voltage demand on aging coil primaries during sustained towing.

The Engineering Solution

This direct-fit overhaul kit integrates eight high-output coil packs with eight fine-wire iridium spark plugs. The coils utilize reinforced internal copper windings and weather-sealed blade terminals designed to resist high underhood temperatures and moisture ingress. Paired with corrosion-resistant iridium electrodes, this assembly lowers overall ionization voltage requirements, sharpens throttle response, and provides stable arc transfer under lean-burn cruise conditions.

Technical Specifications

Compatibility

• 1997 Ford F-250 4.6L V8 (XL, XLT, Lariat)
• 1998 Ford F-250 4.6L V8 (XL, XLT, Lariat)
• 1999 Ford F-250 4.6L V8 (XL, XLT, Lariat)

The Ford Heavy-Duty Standard

Built to handle the sustained thermal demands of heavy payload hauling and towing, this matched ignition system delivers dependable cold starts, smooth idle stability, and restored operational efficiency for your working truck.