Ignition Coil and Iridium Spark Plugs for Cadillac STS (2005-2010) 3.6L
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Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 2005-2010 Cadillac STS
What it Does: Restores factory secondary ignition output and optimal flame kernel propagation across all six cylinders to eliminate misfires, rough idle, and unburned fuel loss.
The Stock STS Ignition Coil Degradation
The 3.6L High Feature V6 generates significant thermal cycling beneath the intake plenum, accelerating dielectric breakdown of the factory epoxy insulation and internal copper windings within the OEM coil-on-plug assemblies. Over time, prolonged exposure to engine heat and high secondary voltage leads to internal shorting, micro-arcing across the boots, and widened spark plug gaps from electrode erosion. This degradation causes P0300 through P0306 cylinder misfire codes, hesitations under load, and reduced catalytic converter service life.
The Engineering Solution
This comprehensive service kit pairs six high-dielectric coil-on-plug units with fine-wire iridium spark plugs designed for thermal resilience. The ignition coils feature reinforced primary and secondary copper windings potted in high-grade dielectric resin to prevent internal flashover under high dwell times. Matched with corrosion-resistant blade terminals and high-density silicone boots, they deliver consistent spark energy to the ultra-fine iridium center electrodes, maintaining precise gap spacing, lower required firing voltages, and complete air-fuel combustion under heavy engine load.
Technical Specifications
| Fitment | 2005-2010 Cadillac STS |
| Engine / Chassis | 3.6L High Feature V6 (LY7 / LLT) / GM Sigma Platform |
| Stock Output | 255-302 hp / 252-272 lb-ft (Approx) |
| Part Number | UF375, 12629037, 12613057, 12583514, C-747, D501C, D510A, E405, 5C1551 |
Compatibility
- 2005 Cadillac STS 3.6L V6 (LY7)
- 2006 Cadillac STS 3.6L V6 (LY7)
- 2007 Cadillac STS 3.6L V6 (LY7)
- 2008 Cadillac STS 3.6L V6 (LLT)
- 2009 Cadillac STS 3.6L V6 (LLT)
- 2010 Cadillac STS 3.6L V6 (LLT)
The Cadillac Precision Benchmark
Engineered to meet direct-injection and port-injection factory dwell profiles, this complete ignition refresh maintains factory calibration integrity, restores smooth idle stability, and prevents fault codes without requiring PCM retuning.
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