Ignition Coil and Iridium Spark Plugs for Cadillac STS (2005-2007) 4.6L

Direct-Replacement Ignition Coil and Iridium Spark Plug Service Kit for 2005-2007 Cadillac STS

Direct Engine Service Kit: Replaces degrading factory coil-on-plug packs and worn spark plugs to eliminate misfires, stabilize idle speed, and restore peak combustion efficiency across all eight cylinders.

The Stock STS Ignition Breakdown

Under-hood thermal cycles within the GM Sigma chassis engine bay severely degrade factory coil insulation and epoxy potting over time. The Northstar 4.6L LH2 V8 subjects secondary ignition components to intense thermal stress, causing micro-fractures in the internal coil housing. This leads to dielectric breakdown, high-RPM secondary voltage leakages, carbon tracking, and intermittent misfires that compromise fuel economy and trigger diagnostic trouble codes.

The Engineering Solution

This comprehensive tune-up kit features eight reinforced ignition coils paired with eight fine-wire iridium spark plugs. Built with high-conductivity copper primary and secondary windings, high-temperature dielectric epoxy potting, and direct-fit blade terminals, these coils resist heat-induced resistance drop. The iridium spark plugs provide superior erosion resistance and a precise spark kernel, requiring lower strike voltage to maintain reliable combustion under full load.

Technical Specifications

Compatibility

• 2005 Cadillac STS Base / Luxury (4.6L V8 LH2 Northstar)
• 2006 Cadillac STS Base / Luxury (4.6L V8 LH2 Northstar)
• 2007 Cadillac STS Base / Luxury (4.6L V8 LH2 Northstar)

The Cadillac Luxury Performance Standard

Engineered to meet exact luxury saloon operational tolerances, this ignition service package delivers smooth, misfire-free power delivery without triggering false CEL warnings or rough idling issues on high-compression Northstar powertrains.