Ignition Coil and Iridium Spark Plugs for Kia Cadenza (2016-2020) 3.3L

OEM-Grade Ignition Coil and Iridium Spark Plug Kit for 2016-2020 Kia Cadenza

What it Does: The ignition coil and iridium spark plug kit replaces fatigued factory coil packs and fouled plugs on the 2016-2020 Kia Cadenza to eliminate misfires, stabilize idle, and restore crisp throttle response.

The Stock Kia Cadenza Ignition Breakdown

Thermal cycling inside the transverse engine bay severely degrades the factory pencil coils on the 3.3L Lambda II G6DH V6. Bank 1 rear cylinders sit directly under the intake plenum, trapping radiant heat that breaks down internal copper windings and hardens lower silicone spark plug boots over time. This thermal fatigue causes dielectric breakdown, micro-arcing, and intermittent high-RPM misfires accompanied by P0300-P0306 diagnostic trouble codes. Simultaneously, factory spark plug electrode erosion increases secondary voltage demand, placing unnecessary electrical load on aging coil drivers and leading to incomplete combustion.

The Engineering Solution

This complete six-cylinder service kit restores primary and secondary ignition integrity using high-dielectric epoxy resin and high-grade copper windings engineered to resist prolonged thermal saturation. The matched fine-wire iridium spark plugs lower the required ionization voltage across the gap, providing consistent flame front propagation even under high cylinder pressures. Molded silicone boots prevent corona discharge and carbon tracking down the plug insulator. Designed as direct-fit replacements for OEM parts 273103L000 and UF844, this kit installs seamlessly with factory dwell timing and harness connectors without requiring ECU modifications.

Technical Specifications

Compatibility

• 2016 Kia Cadenza 3.3L V6 (Premium, Limited)
• 2017 Kia Cadenza 3.3L V6 (Premium, Technology, Limited)
• 2018 Kia Cadenza 3.3L V6 (Premium, Technology, Limited)
• 2019 Kia Cadenza 3.3L V6 (Premium, Technology, Limited)
• 2020 Kia Cadenza 3.3L V6 (Technology, Limited)

Frequently Asked Questions

Does this fit the YG Cadenza?
Yes, this is a direct fit for the 2016-2020 Kia Cadenza equipped with the Lambda II G6DH 3.3L engine.

Are the iridium spark plugs pre-gapped for this engine?
Yes, the spark plugs are calibrated to factory gap dimensions, though verifying gap clearance prior to torquing is standard service procedure.

The Kia Drivability Caliber

Restoring clean ignition performance across all six cylinders preserves catalytic converter efficiency, eliminates raw fuel washdown in cylinder bores, and maintains the refined highway cruising dynamics demanded of an executive sedan.