Ignition Coil and Iridium Spark Plugs for Cadillac CTS (2005-2007) 2.8L

OEM-Grade Direct-Fit Ignition Tune-Up Kit for 2005-2007 Cadillac CTS

What it Does: Replaces degrading factory ignition coils and worn plugs to eliminate secondary ignition breakdown and restore precise combustion timing across all six cylinders.

The Stock CTS Ignition Breakdown

Over sustained thermal cycles inside the tightly packaged Sigma engine bay, factory coil boots and primary/secondary copper windings suffer from dielectric fatigue. High under-hood heat causes micro-cracking in the epoxy insulation, leading to secondary spark leakage, high-RPM misfires (codes P0300 through P0306), and unburnt hydrocarbons fouling the catalytic converters. Concurrently, degraded factory plugs widen their gap under erosion, increasing electrical resistance and accelerating coil failure.

The Engineering Solution

This complete direct-replacement service kit pairs six heavy-duty coil-on-plug assemblies with six fine-wire iridium spark plugs. Each ignition coil features high-conductivity internal copper windings, factory-spec blade connectors, and heat-stabilized silicone boots to resist dielectric arc-through. The paired iridium plugs utilize an ultra-dense, erosion-resistant center electrode, reducing required ionization voltage and ensuring consistent flame kernel propagation under load.

Technical Specifications

Compatibility

• 2005 Cadillac CTS 2.8L V6 (LP1 Engine / GM Sigma I Chassis)
• 2006 Cadillac CTS 2.8L V6 (LP1 Engine / GM Sigma I Chassis)
• 2007 Cadillac CTS 2.8L V6 (LP1 Engine / GM Sigma I Chassis)

The Cadillac Caliber

Engineered to meet precise factory electronic resistance tolerances, this kit prevents ECU check-engine warnings, smoothing out rough cold starts and restoring the quiet, vibration-free idle expected of a luxury sport sedan.