Ignition Coil & Iridium Spark Plugs & Wire for Chevrolet Avalanche (2002-2006) 5.3L

Direct-Fit High-Output Ignition Service Kit for 2002-2006 Chevrolet Avalanche

What it Does: Delivers a complete secondary ignition overhaul to eliminate high-load misfires, restore lost combustion efficiency, and stabilize idle across all eight cylinders.

The Stock Avalanche Ignition Breakdown

The factory round-style ignition coils and secondary wiring on the GMT800 platform endure prolonged thermal cycling within crowded engine bays. Over time, internal epoxy insulation breaks down, causing primary and secondary winding short circuits under high-load towing. Concurrently, factory carbon-core plug wires degrade internally from heat soak, driving resistance upward and choking spark voltage. Coupled with worn plug electrodes, this increased impedance induces chronic P0300 multi-cylinder misfires, unburnt hydrocarbon build-up, sluggish throttle response, and degraded fuel economy under payload.

The Engineering Solution

This comprehensive tune-up kit restores ignition integrity using eight heavy-duty UF262/D585 round-style coils with epoxy-potted windings, integrated heatsinks, and dielectric silicone boots to prevent high-voltage arcing. Paired with 8mm spiral-wound stranded copper-core wires, secondary resistance drops dramatically while heat-shielded stainless steel terminals deflect manifold radiant heat. The included 41-962 fine-wire iridium spark plugs feature laser-welded tips that resist electrical erosion, providing a precise, concentrated flame kernel and dependable ignition across demanding duty cycles.

Technical Specifications

Compatibility

• 2002-2006 Chevrolet Avalanche 1500 5.3L V8 (Confirm original coils feature the round UF262 / D585 body style)

The Chevrolet Heavy-Duty Caliber

Engineered to meet the rigors of heavy hauling and trailering, this ignition setup maintains consistent spark saturation under sustained high-manifold-pressure conditions, keeping your Vortec powertrain performing reliably on the job site or highway.