Ignition Coil and Iridium Spark Plugs for Buick LaCrosse (2005-2008) 3.6L

Direct-Fit High-Reliability Ignition Coil and Iridium Spark Plug Kit for 2005-2008 Buick LaCrosse 3.6L

Primary Function: Complete 6-cylinder ignition service kit engineered to restore factory spark energy, eliminate cylinder misfires, and stabilize idle quality on the LY7 V6 engine.

The Stock LaCrosse Secondary Ignition Breakdown

Factory coil packs on the GM 3.6L LY7 engine operate in a tightly packaged, high-heat transverse cylinder head environment. Over prolonged heat cycles, OEM epoxy insulation degrades, causing internal winding shorts and dielectric punch-through along the plug boot. Combined with worn factory spark plug gaps that increase secondary voltage demand, this degradation triggers P0300-P0306 misfire codes, erratic idle, sluggish throttle response, and unburned fuel contamination in the catalytic converters.

The Engineering Solution

This overhaul kit pairs six reinforced coil-on-plug units with fine-wire iridium spark plugs. The ignition coils feature premium internal copper windings and high-dielectric silicone boots that resist thermal breakdown and prevent voltage flashover. Matched with high-melting-point iridium core electrodes, this kit maintains a stable spark gap under heavy engine loads, ensuring complete flame front propagation and crisp combustion dynamics.

Technical Specifications

Compatibility

• 2005 Buick LaCrosse CXS (3.6L V6 LY7)
• 2006 Buick LaCrosse CXS (3.6L V6 LY7)
• 2007 Buick LaCrosse CXS (3.6L V6 LY7)
• 2008 Buick LaCrosse CXS (3.6L V6 LY7)

The Buick Smooth-Drivability Standard

Engineered to meet exact GM diagnostic parameters, this ignition kit delivers instant cold-crank ignition, seamless acceleration, and vibration-free cruising without triggering false-positive ECU trouble codes or check engine lights.