Ignition Coil & Spark Plug for Chevy Trailblazer EXT (2005-2009) V8 (Round Style)

High-Energy Ignition Coil & Spark Plug Kit for 2005-2009 Chevrolet Trailblazer

Replaces aging factory coils, plugs, and wires to eliminate misfires and restore optimal ignition timing on Gen III/IV LS-based V8 engines.

The Stock Trailblazer Ignition Degradation

Over thousands of severe heat cycles, the factory GM ignition coils suffer from internal epoxy breakdown and primary winding degradation. Prolonged heat soak within the tight GMT360/GMT370 engine bay leads to significant voltage drop, which translates into intermittent misfires, rough idling, and noticeably reduced fuel economy under load. Furthermore, aging OEM plug wires experience increased electrical resistance as their internal carbon cores break down, severely weakening the spark energy before it even reaches the combustion chamber.

The Engineering Solution

This comprehensive ignition overhaul utilizes upgraded round-style (UF414/D514A) coils engineered with high-grade internal copper windings and premium high-temperature epoxy to actively resist thermal breakdown. Producing 32,000 maximum volts and a 61:1 turns ratio, these coils deliver 20% more discharge energy than standard OEM units, guaranteeing a robust and consistent spark. Paired with low-resistance silicone-jacketed 748UU plug wires and pre-calibrated 41962 spark plugs, the system ensures maximum voltage transfer and complete cylinder combustion. This cures hesitation, restores lost low-end torque, and stabilizes idle vacuum. Always verify your engine utilizes the round-style coil bodies prior to installation, and apply dielectric grease to the boots to prevent rubber adhesion.

Technical Specifications

Compatibility

• Cadillac Escalade
• Chevrolet Avalanche
• Chevrolet Silverado
• Chevrolet Suburban
• Chevrolet Express
• Chevrolet Tahoe
• Chevrolet Trailblazer
• GMC Savana
• GMC Yukon
• Hummer H3

Note: Compatible with specific V8 models requiring round-style coils. Replaces OE #s: C1512, D514A, UF414, 5C1555, E894, 52-1820, IC534, 12573190, 12570616, 12611424, 1788407.

The Chevrolet Heavy-Duty Caliber

When hauling loads or navigating harsh conditions, reliable ignition is critical. This high-output coil and plug set ensures your GM truck or SUV maintains peak thermal efficiency and relentless pulling power under heavy loads without triggering a check engine light.