Ignition Coil and Iridium Spark Plugs for Pontiac Bonneville (2004-2005) 4.6L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2004-2005 Pontiac Bonneville

Direct-Fit Ignition Refresh: Restores factory secondary voltage delivery and complete cylinder combustion across all cylinders to resolve misfires, hesitation, and rough idle under load.

The Stock Bonneville Thermal Breakdown and Misfire Issues

In the tightly packed transverse engine bay of the Northstar V8, OEM ignition coils and aging spark plugs endure extreme thermal cycling. Over mileage, internal coil epoxy insulation breaks down, creating micro-arcing and secondary winding resistance drift. When paired with worn spark plug electrodes that have widened gaps, the ignition system requires excessive voltage to bridge the gap, leading to P0300 multi-cylinder misfires, loss of high-RPM power, unburned fuel washdown, and catalytic converter damage.

The Engineering Solution

This complete ignition overhaul package features 8 heavy-duty coil-on-plug assemblies equipped with high-conductivity internal copper windings, durable dielectric housing, and direct-fit blade terminal connectors to prevent voltage leakage. Paired with 8 fine-wire iridium spark plugs, the kit reduces the required arc voltage while resisting thermal erosion. The result is instant cold-start ignition, consistent flame-front propagation, smooth idle stability, and restored full-throttle power output across the entire rev range.

Technical Specifications

Compatibility

• 2004 Pontiac Bonneville GXP 4.6L V8 (LD8)
• 2005 Pontiac Bonneville GXP 4.6L V8 (LD8)

The Pontiac V8 Performance Standard

Designed specifically to handle the thermal demands and high-compression combustion characteristics of the Northstar V8, this kit ensures dependable throttle response and optimal power delivery without spark blowout.