Ignition Coil & Spark Plugs for Cadillac CTS-V (2004-2005) 5.7L V8

High-Output Ignition Coil & Spark Plugs for 2004-2005 Cadillac CTS

Restores critical spark energy and eliminates high-load misfires on the 5.7L LS6 engine by upgrading the complete ignition system.

The Stock LS6 Ignition Shortcoming

Over time, the factory ignition coils on the early GM Sigma platform CTS-V suffer from severe thermal degradation. Positioned directly above the exhaust manifolds, the OEM coil packs endure constant heat soak cycles. This extreme under-hood temperature breaks down the internal epoxy potting and primary windings, leading to micro-cracks in the plastic housing. Once these stress fractures form, moisture ingress causes internal arching, resulting in voltage leaks, persistent misfires under heavy load, rough idling, and diminished throttle response. Additionally, aging OEM spark plug wires exhibit increased electrical resistance, heavily taxing the ignition system and frequently triggering intermittent P0300 series misfire codes.

The Engineering Solution

This comprehensive 8-piece ignition kit addresses the LS6 heat retention issues by utilizing high-grade dielectric materials and reinforced housings. The replacement ignition coils are constructed with premium copper windings and a heavy-duty protective wire coating that fiercely resists the thermal cracking and pinhole leaks common in factory units. By optimizing the primary and secondary winding ratios, these coils deliver maximum voltage output to the spark plugs, ensuring a complete and efficient combustion cycle. The included low-resistance spark plug wires feature thick silicone jacketing to deflect manifold heat and prevent electromagnetic interference (EMI). Paired with fresh spark plugs, this kit guarantees reliable high-rpm ignition, lower emissions, and a restored factory power curve without voltage drop-offs.

Technical Specifications

Compatibility

• 2004 Cadillac CTS-V 5.7L V8
• 2005 Cadillac CTS-V 5.7L V8

The Cadillac V-Series Caliber

Engineered for the demanding nature of modern American muscle, this complete ignition overhaul ensures your LS6 delivers relentless horsepower and crisp throttle response, eliminating diagnostic headaches and keeping your CTS running at peak performance.