Ignition Coil & Spark Plug for Chevy Impala (2006-2009) 5.3L V8 (Round Style)

High-Energy Ignition Coil & Spark Plug Kit for 2006-2009 Chevrolet Impala

Direct Replacement Ignition Upgrade: This round-style ignition coil, spark plug, and wire kit replaces degraded factory components to restore misfire-free performance and maximize LS4 combustion efficiency.

The Stock W-Body LS4 Ignition Weakness

The factory D514A style ignition coils found on transverse 5.3L LS4 engines are notoriously vulnerable to age-related thermal degradation. Years of extreme under-hood heat soak cause the internal epoxy to break down and the copper windings to short, leading to severely weakened spark output. This primary voltage drop results in rough idling, hesitation under load, cylinder misfires, and unburnt fuel washing down the cylinder walls. Furthermore, the OEM plug wires are highly prone to carbon tracking and increased resistance over time, further degrading the ignition energy required to efficiently detonate the air-fuel mixture.

The Engineering Solution

This upgraded ignition kit utilizes round-body UF414/D514A replacement coils featuring enhanced internal epoxy insulation and premium copper wire construction to combat extreme thermal breakdown. Engineered with a 61:1 turns ratio and a maximum output of 32,000 volts, these coils deliver up to 20% more discharge energy than standard OEM replacements, guaranteeing a robust and consistent spark event. Combined with brand-new 748UU spark plug wires and 41962 spark plugs, the entire secondary ignition circuit is optimized. This configuration drastically reduces primary resistance to 0.660 ohms while minimizing electrical interference, resulting in immediate throttle response and restored fuel economy.

Technical Specifications

Compatibility

• 2006-2009 Chevrolet Impala (5.3L V8)
• Cadillac Escalade
• Chevrolet Avalanche
• Chevrolet Silverado
• Chevrolet Suburban
• Chevrolet Express
• Chevrolet Tahoe
• Chevrolet Trailblazer
• GMC Savana
• GMC Yukon
• Hummer H3
• Fitment Note: Only applicable to round-style coils (UF414/D514A). Not suitable for square-body coils (UF413/D510C). Please verify your original coil shape before installation.
• Replaces OEM Parts: C1512, D514A, UF414, 5C1555, E894, 52-1820, IC534, 12573190, UF-414, GN10165, 12570616, 12611424, 1788407

The Chevrolet Muscle Caliber

Keeping your LS4-powered Impala SS firing flawlessly on all eight cylinders is crucial for delivering that signature V8 torque curve. This comprehensive ignition overhaul provides the reliability, strong spark, and electrical consistency required for heavy throttle applications, ensuring factory-level drivability and restored American muscle performance.