Ignition Coil & Spark Plug for Buick Allure LaCrosse (2008-2009) Rainier (2005-2007) 5.3L V8 (Round Style)

High-Energy Ignition Coil & Spark Plug Set for 2008-2009 Buick Allure, LaCrosse

Direct plug-and-play ignition upgrade: Replaces the aging stock coils, plugs, and wires on your 5.3L V8 to eliminate misfires and deliver a stronger, more consistent spark.

The Stock W-Body Ignition Shortcoming

Over time, the factory ignition coils on the transverse-mounted 5.3L LS4 V8 suffer from severe heat soak. The confined engine bay of the W-body chassis traps thermal energy, causing the OEM coil's internal epoxy to degrade. This thermal breakdown increases primary resistance, leading to weakened spark output, rough idling, hesitation under heavy engine load, and eventual coil failure. Furthermore, the factory plug wires gradually lose their dielectric insulation properties, causing parasitic voltage leaks and contributing to annoying misfire codes that rob the engine of power.

The Engineering Solution

This complete ignition overhaul kit replaces the restrictive and degradation-prone OEM components with high-performance alternatives. The UF414 round-style ignition coils are manufactured with premium-grade copper windings and high-temperature epoxy internals, producing an impressive 32,000 volts—a 20% increase in discharge energy over standard factory specifications. This stronger spark ensures a more complete combustion cycle, optimizing fuel efficiency and throttle response. Paired with exact-fit spark plugs and heavy-duty silicone-insulated plug wires, this kit restores reliable ignition timing, prevents voltage bleed, and is built to stand up to the extreme ambient temperatures of the LS4 engine bay.

Technical Specifications

Compatibility

• Buick Allure / LaCrosse 5.3L V8 (2008-2009)
• Buick Rainier (2005-2007)
• Cadillac Escalade
• Chevrolet Avalanche
• Chevrolet Silverado
• Chevrolet Suburban
• Chevrolet Express
• Chevrolet Tahoe
• Chevrolet Trailblazer
• GMC Savana
• GMC Yukon
• Hummer H3
• Note: Only applicable to round style coils (UF414 / D514A). Not suitable for square body coils (UF413 / D510C). Please verify original coil shape before ordering.

The Buick Performance Standard

Whether you're cruising the highway or demanding maximum passing power from the 5.3L LS4, reliable ignition is non-negotiable. This kit ensures your W-body Buick delivers the smooth, torquey performance it was engineered for, eliminating frustrating misfires and providing a consistent, powerful spark under all load conditions.