Ignition Coil and Iridium Spark Plugs for Kia Sedona (2002-2005) 3.5L

High-Dielectric Ignition Coil and Iridium Spark Plug Kit for 2002-2005 Kia Sedona

What it Does: The Ignition Coil and Iridium Spark Plug Kit replaces degraded factory secondary ignition components on the 2002-2005 Kia Sedona to eliminate cylinder misfires, restore lost combustion efficiency, and stabilize idle quality.

The Stock Kia Sedona Waste-Spark Heat Degradation

The 3.5L Sigma G6CU V6 engine in the first-generation GQ platform utilizes a waste-spark ignition configuration where three coil packs mount on the front cylinder bank and trigger companion cylinders across the manifold. Because each coil fires on both compression and exhaust strokes, their thermal duty cycle is double that of sequential ignition systems. Over time, extreme underhood thermal cycling causes factory epoxy potting to crack, resulting in internal insulation breakdown, secondary resistance spikes, and severe carbon tracking. Combined with worn plugs that require higher ionization voltage, this breakdown manifests as P0300-series misfire codes, hesitations under load, and unburned fuel entering the catalytic converters.

The Engineering Solution

This comprehensive service kit resolves voltage drop and misfire issues by pairing three high-output replacement coil packs with six fine-wire iridium spark plugs. The coils are engineered with high-dielectric PBT housings and vacuum-impregnated epoxy encapsulation to block moisture and eliminate micro-arcing under high thermal loads. High-permeability silicon steel magnetic cores match OEM primary/secondary winding parameters, offering a direct replacement for interchange numbers UF432, CUF267, and 5C1193. The included iridium-tipped spark plugs feature laser-welded fine-wire center electrodes that demand lower firing voltages, ensuring stable arc projection, cleaner flame-front propagation, and maximum erosion resistance under waste-spark demands.

Technical Specifications

Compatibility

• 2002 Kia Sedona EX Minivan 3.5L V6 (Sigma G6CU)
• 2002 Kia Sedona LX Minivan 3.5L V6 (Sigma G6CU)
• 2003 Kia Sedona EX Minivan 3.5L V6 (Sigma G6CU)
• 2003 Kia Sedona LX Minivan 3.5L V6 (Sigma G6CU)
• 2004 Kia Sedona EX Minivan 3.5L V6 (Sigma G6CU)
• 2004 Kia Sedona LX Minivan 3.5L V6 (Sigma G6CU)
• 2005 Kia Sedona EX Minivan 3.5L V6 (Sigma G6CU)
• 2005 Kia Sedona LX Minivan 3.5L V6 (Sigma G6CU)

Frequently Asked Questions

Does this fit the GQ Sedona?
Yes, this is a direct fit for the 2002-2005 Kia Sedona equipped with the Sigma G6CU engine.

Why does this 6-cylinder kit only include three ignition coils?
The 3.5L V6 utilizes a waste-spark setup where three dual-tower coil packs each drive two companion spark plugs simultaneously.

The Kia Reliability Standard

Designed to handle the high thermal cycles of family hauling and stop-and-go commuting, this direct-fit ignition package restores factory combustion balance, protects downstream emissions components, and ensures immediate cold-start reliability without ECU tuning.