Ignition Coil & Spark Plug for GMC Envoy XL XUV (2005-2009) V8 (Round Style)

High-Output Ignition Coil & Spark Plug Kit for 2005-2009 GMC Envoy

What it Does: This direct plug-and-play coil, wire, and spark plug kit replaces degrading factory ignition components to restore misfire-free power and deliver a 20% increase in spark energy over OE coils.

The Stock Envoy Vortec Ignition Shortcomings

The factory Delco ignition coils on the 5.3L Vortec V8 engines are notoriously prone to internal epoxy degradation and thermal breakdown over thousands of heat cycles. Mounted directly to the valve covers, these original coils endure relentless under-hood temperatures, leading to micro-cracking in the internal epoxy potting. Once this insulation is compromised, high-voltage leaks occur, resulting in weak spark delivery, erratic idling, engine misfires under load, and delayed throttle response. Furthermore, high-mileage OEM spark plug wires often experience increased electrical resistance and cracked silicon boots, compounding the ignition deficiency and leading to persistent Check Engine Lights.

The Engineering Solution

This comprehensive ignition overhaul addresses these specific failure points by utilizing advanced coil architecture with premium epoxy construction and high-conductivity copper wire internals. These round-style UF414/D514A replacement coils feature an optimized 61:1 turns ratio, generating up to 32,000 volts—a 20% surge in discharge energy compared to standard factory coils. This heightened maximum voltage ensures a more complete and rapid combustion event inside the cylinder, effectively eliminating spark blowout under heavy engine load or towing conditions. Combined with the included 748UU plug wires and 41962 spark plugs, this system guarantees optimal primary resistance (0.660 ohms) and secondary resistance (6.1K ohms), restoring precise engine timing and maximizing fuel burn efficiency.

Technical Specifications

Compatibility

• Cadillac Escalade
• Chevrolet Avalanche
• Chevrolet Silverado
• Chevrolet Suburban
• Chevrolet Express
• Chevrolet Tahoe
• Chevrolet Trailblazer
• GMC Savana
• GMC Yukon
• Hummer H3
• Note: Only applicable to vehicles equipped with Round Style Coils (UF414/D514A). Not suitable for Square Style Coils (UF413/D510C). Please verify your factory coil shape before installation.

The GMC Caliber

For the GMT360 platform, consistent torque delivery is paramount for hauling, towing, and daily drivability. Upgrading your Vortec's ignition system ensures rock-solid reliability, smooth power delivery, and eliminates frustrating ignition-related hesitation when demanding peak performance from your V8.