Ignition Coil and Iridium Spark Plugs for Buick Rainier (2006-2007) 4.2L

Direct-Fit Ignition Coil & Iridium Spark Plug Service Kit for 2006-2007 Buick Rainier

Direct-Replacement Ignition Overhaul: Restores factory secondary ignition performance, stabilizes idle harmonics, and resolves multi-cylinder misfires under high-load conditions on the GM Atlas 4.2L platform.

The Stock Rainier LL8 Ignition Degradation

The Vortec 4.200 inline-six configuration features tight spark plug wells situated directly atop the DOHC cylinder head, trapping significant thermal energy. Over prolonged heat cycles, OEM coil packs suffer epoxy insulation breakdown and secondary winding dielectric fatigue. This causes microscopic spark arc-through, resulting in high-RPM stutter, increased hydrocarbon emissions, and intermittent P0300 through P0306 diagnostic trouble codes. Simultaneously, factory standard-electrode spark plugs experience accelerated gap erosion, requiring elevated secondary voltage that overstresses aging coils.

The Engineering Solution

This comprehensive service pack combines 6 direct-fit coil-on-plug assemblies featuring high-grade electrolytic copper primary and secondary windings with premium potted epoxy casings to resist thermal degradation and internal shorting. Paired with 6 fine-wire iridium spark plugs, the kit reduces requisite firing voltage while providing superior spark kernel stability and resistance to carbon fouling across varying combustion chamber pressures. Direct-fit blade terminals and silicone dielectric boots guarantee positive contact and seal out moisture.

Technical Specifications

Compatibility

• 2006 Buick Rainier CXL 4.2L L6 Gas (GMT360)
• 2006 Buick Rainier CXL Plus 4.2L L6 Gas (GMT360)
• 2007 Buick Rainier CXL 4.2L L6 Gas (GMT360)

The Buick Reliability Standard

Engineered to sustain smooth power transfer and dependable towing capacity, this complete ignition refresh eliminates intermittent misfires and restores the refined, quiet cruise characteristics engineered into the Rainier platform.