Ignition Coil & Iridium Spark Plugs for Infiniti Q40 (2015) 3.7L V6

High-Performance Ignition Coils & Iridium Spark Plugs for Infiniti Q40

Direct-fit replacement ignition coils and pre-gapped iridium spark plugs engineered to restore factory combustion efficiency and eliminate misfires under load.

The Stock Q40 Ignition System Weakness

The OEM ignition coils on the VQ37VHR engine are notorious for thermal degradation due to excessive heat soak in the V6 engine bay. Over time, continuous heat cycling degrades the internal epoxy potting and primary windings, leading to increased electrical resistance. This causes voltage drops, weak spark generation, and eventual misfires under heavy load. Simultaneously, standard nickel or platinum spark plugs erode rapidly under the high-revving characteristics of the 3.7L engine, increasing the spark gap beyond the factory specification and severely impacting throttle response and fuel economy.

The Engineering Solution

This comprehensive ignition kit solves thermal degradation by utilizing upgraded copper windings and high-temperature epoxy potting within the ignition coils, ensuring consistent voltage output and resistance to extreme engine bay heat soak. The included high-performance iridium spark plugs feature an ultra-fine wire center electrode that requires less voltage to fire while delivering a significantly stronger spark front. Iridium's exceptionally high melting point provides substantially better durability than traditional nickel or platinum equivalents. Pre-gapped to precisely 0.8mm-0.9mm, these plugs ensure optimal combustion geometry, stabilizing the idle and restoring the linear power delivery characteristic of the V36 chassis.

Technical Specifications

Compatibility

• 2015 Infiniti Q40 3.7L V6

The Infiniti Precision Standard

Designed to maintain the refined power and high-revving exhaust note of the VQ-series engine, ensuring precision performance, robust idle stability, and a smooth powerband without the risk of check engine lights.