Ignition Coil & Spark Plug for Isuzu Ascender (2005-2006) 5.3L V8 (Round Style)

High-Energy Ignition Coil & Spark Plug Kit for 2005-2006 Isuzu Ascender

Direct replacement complete ignition tune-up kit designed to restore lost spark energy and resolve misfires in the 5.3L V8 GMT360 platform.

The Stock Ascender Ignition Breakdown

The factory D514A/UF414 round-style ignition coils on the 5.3L LS-based V8 are prone to thermal degradation over time due to persistent heat cycling under the hood. As the OE epoxy breaks down, secondary winding resistance increases, leading to weak spark delivery under load. This commonly manifests as an intermittent P0300 random misfire code, rough idle, hesitation during acceleration, and decreased fuel efficiency. Additionally, the factory spark plug wires often experience dielectric breakdown and silicone jacket cracking, further deteriorating the spark transfer and triggering check engine lights.

The Engineering Solution

This comprehensive ignition kit provides a robust upgrade over the aging factory setup. Each round-style coil pack is manufactured with high-grade epoxy internal construction to resist thermal shock and mechanical vibration. Engineered to deliver a maximum voltage output of 32,000V with a 61:1 turns ratio, these coils yield up to 20% more discharge energy than OE equivalents. The upgraded internal copper windings maintain a strict 0.660 ohm primary and 6.1K ohm secondary resistance for a strong, consistent spark. Paired with precise-fit 748UU plug wires featuring durable jackets to prevent arcing, and 41962 spark plugs for optimal combustion, this kit ensures a smooth idle and reliable power delivery across the RPM range.

Technical Specifications

Compatibility

• 2005-2006 Isuzu Ascender 5.3L V8 (Must verify Round Coil style)
• 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 coils (D514A / UF414), not suitable for square coils.

The GMT360 Towing Standard

For an SUV built to haul, maintaining optimal combustion is critical for consistent torque delivery. This ignition set guarantees reliable towing power and smooth daily drivability without the misfires or loss of power associated with degraded factory components.