Ignition Coil & Iridium Spark Plugs & Wire GMC Sierra 1500 Limited (2014-2020) 5.3L 6.2L V8

High-Output Ignition Coil & Iridium Spark Plug Kit for 2014-2020 GMC Sierra

What it Does: This complete ignition service kit replaces degraded factory coils, plugs, and wires to restore combustion efficiency, eliminate misfires, and stabilize idle quality in your 5.3L or 6.2L EcoTec3 V8.

The Stock Sierra Ignition Shortcomings

The factory ignition system on the K2XX and T1XX chassis Sierra is highly susceptible to thermal degradation and electrical resistance over high-mileage heat cycles. The OEM coils utilize standard winding densities that eventually break down, leading to voltage leaks and weak spark propagation. Combined with deteriorating factory spark plug wires lacking adequate thermal shielding against exhaust manifold heat, this resistance manifests as engine hesitation, poor gas mileage, cylinder misfires, and illuminated CEL or VSC warnings under heavy loads or towing conditions.

The Engineering Solution

This upgraded ignition package delivers a 20% increase in spark energy over OE parameters, utilizing coils built with high-density copper windings and an epoxy-potted internal construction to prevent moisture intrusion and vibration damage. Pushing up to 26,000 volts with a 61:1 turns ratio, these coils ensure complete and efficient fuel burn. The included high-quality iridium spark plugs (41-114) feature an ultra-high melting point for consistent, powerful arcs, while the 8mm silicone spark plug wires feature integrated heat shields to withstand extreme exhaust temperatures without degrading electrical conductivity. This optimized spark delivery translates to restored horsepower, sharper throttle response, and a rock-solid idle.

Technical Specifications

Compatibility

• 2014 GMC Sierra 1500 5.3L / 6.2L V8
• 2015 GMC Sierra 1500 5.3L / 6.2L V8
• 2016 GMC Sierra 1500 5.3L / 6.2L V8
• 2017 GMC Sierra 1500 5.3L / 6.2L V8
• 2018 GMC Sierra 1500 5.3L / 6.2L V8
• 2019 GMC Sierra 1500 Limited 5.3L / 6.2L V8
• 2020 GMC Sierra 1500 5.3L / 6.2L V8

The GMC Heavy-Duty Standard

Whether hauling heavy payloads or navigating daily commutes, a robust ignition system is critical for your V8 truck's reliability. This comprehensive tune-up kit ensures your Sierra delivers consistent towing power, optimal fuel economy, and dependable cross-country durability without the risk of misfire-induced downtime.