Ignition Coil + Iridium Spark Plugs for Kia Optima (2004-2005) 2.7L

Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2004-2005 Kia Optima (GD)

What it Does: The ignition coil pack and iridium spark plug kit replaces aged factory ignition components on the 2004-2005 Optima to eliminate cylinder misfires, restore clean flame propagation, and stabilize idle quality.

The Stock Kia Optima Ignition Breakdown

The waste-spark ignition pack on the Delta G6BA engine is subjected to continuous thermal cycling and vibrational stress on the cylinder head. Over time, internal epoxy insulation breaks down, causing secondary winding breakdown, inter-coil arcing, and carbon tracking. Paired with worn factory standard plugs widening their gap past spec, the increased primary resistance stresses the power transistor, triggering chronic hesitation, unburned fuel blow-by, and recurring P0300 through P0306 diagnostic trouble codes.

The Engineering Solution

This service kit pairs a high-dielectric reinforced molded coil pack with pre-gapped NGK Iridium IX (5464) spark plugs. The replacement ignition coil pack features heat-resistant copper windings and premium potting compound to withstand intense engine bay heat soak while maintaining nominal dwell time. The NGK plugs utilize a 0.6mm fine-wire laser-welded iridium center electrode and tapered ground electrode to minimize quench effect, lower ignition voltage demand, and deliver consistent, high-energy spark discharge under high-load acceleration.

Technical Specifications

Compatibility

• 2004 Kia Optima 2.7L V6 (LX, EX)
• 2005 Kia Optima 2.7L V6 (LX, EX)

Frequently Asked Questions

Does this fit the GD Optima?

Yes, this is a direct fit for the 2004-2005 Kia Optima equipped with the 2.7L Delta V6 (G6BA) engine.

Are spark plug wires included with this coil kit?

No, high-tension secondary spark plug ignition wires are not included and must be reused or replaced separately.

The Kia Commuter Benchmark

Restoring complete primary and secondary spark integrity guarantees dependable daily commuting, eliminating stubborn misfires while maximizing thermal efficiency across all six combustion chambers.