Ignition Coil and Iridium Spark Plugs for Buick Lucerne (2006-2011) 4.6L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2006-2011 Buick Lucerne

Direct Ignition Overhaul: Complete 8-cylinder ignition replacement kit engineered to eliminate misfires, stabilize idle fluctuations, and restore factory combustion efficiency on 4.6L Northstar-equipped Lucerne sedans.

The Stock Lucerne Northstar Dielectric Breakdown

Due to the transverse layout of the 4.6L V8, the rear cylinder bank is subjected to excessive thermal saturation. Over time, OEM coil housings experience micro-fractures in the potting epoxy, allowing high-voltage secondary arc leakage to the cylinder head rather than the plug gap. Simultaneously, aged factory plugs suffer from electrode erosion, widening the gap and over-saturating the primary driver circuit, resulting in P0300-P0308 trouble codes and rough acceleration under load.

The Engineering Solution

This comprehensive kit restores full ignition performance by pairing heavy-duty coil-on-plug assemblies with fine-wire iridium spark plugs. The ignition coils feature high-purity oxygen-free copper internal windings and reinforced dielectric casings that resist heat soak and thermal degradation. The included fine-wire iridium plugs significantly reduce arc quenching, lower the required firing voltage, and ensure rapid, complete flame kernel expansion across the combustion chamber.

Technical Specifications

Compatibility

• 2006–2011 Buick Lucerne CXS (4.6L V8 Northstar LD8)
• 2008–2011 Buick Lucerne Super (4.6L V8 Northstar L37)
• 2008–2011 Buick Lucerne CXL (4.6L V8 Northstar LD8)

The Buick Smooth-Idle Standard

Engineered to meet OE electrical impedance specifications, this ignition package preserves the refined NVH characteristics of the GM G-body platform, ensuring consistent cold-start ignition and seamless power delivery without setting spurious misfire DTCs.