Ignition Coil & Iridium Spark Plugs & Wire for Chevrolet Express 1500 2500 3500 (2003-2007) 4.8L 5.3L 6.0L

Direct-Replacement Ignition Overhaul Kit for 2003-2007 Chevrolet Express

What it Does: Restores factory secondary ignition output by renewing degraded coil-on-plug units, spark plug wires, and electrodes to eliminate under-load misfires and unburned fuel cycles.

The Stock Express Thermal Degradation Problem

The enclosed doghouse engine bay of the GMT610 platform subjects ignition hardware to severe heat soak. Factory coil epoxy insulation develops microscopic stress fractures over time, creating internal secondary winding shorts. Concurrently, factory wire jacketing undergoes thermal hardening, leading to carbon tracking and insulation breakdown under load. Worn factory plugs experience electrode erosion that increases the firing gap, over-taxing the driver circuits in the PCM and causing rough idle, hesitation, and catalyst-damaging misfires during heavy hauling.

The Engineering Solution

This complete ignition refresh features eight round-body D585-style coil packs with external heat sinks engineered for superior heat dissipation, hermetically sealed in high-dielectric epoxy with four-pin OEM connectors. Paired with fine-wire iridium spark plugs for low required voltage and stable arc formation across extreme combustion pressures, this kit includes 8mm double-extruded silicone plug wires with high-temp boots and corrosion-resistant stainless-steel locking terminals to isolate secondary voltage and eliminate RF interference.

Technical Specifications

Compatibility

• 2003-2007 Chevrolet Express 1500: 5.3L V8 (Round UF262/D585 coils)
• 2003-2007 Chevrolet Express 2500: 4.8L, 5.3L, 6.0L V8 (Round UF262/D585 coils)
• 2003-2007 Chevrolet Express 3500: 4.8L, 5.3L, 6.0L V8 (Round UF262/D585 coils)

The Chevrolet Commercial Workhorse Standard

Commercial fleet operations demand consistent cold starts and uncompromised low-end torque under maximum gross combined weight ratings. This full ignition replacement restores reliable combustion dynamics, ensuring heavy loads and continuous towing duty cycles are managed without power loss or heat-induced spark degradation.