Ignition Coil & Iridium Spark Plugs for Infiniti G25 (2011-2012) 2.5L

Direct-Fit Ignition Coils & Iridium Spark Plugs for 2011-2012 Infiniti G25 (VQ25HR / V36)

Restores lost ignition efficiency and eliminates misfires by delivering a consistent, high-energy spark directly to the combustion chamber. Designed as a direct replacement for aging factory ignition components, this kit ensures optimal fuel burn, stable idling, and precise power delivery throughout the RPM range.

The Stock VQ25HR Ignition Weakness

The factory ignition coils on the VQ25HR engine are prone to thermal degradation due to prolonged engine bay heat exposure. Heat soak causes internal epoxy resin breakdown, leading to micro-cracks in the coil housing. This results in voltage leaks, intermittent misfires, a rough idle, and sluggish throttle response. Additionally, standard OEM spark plugs experience rapid electrode erosion, widening the spark gap over time. A wider gap forces the ignition coils to work harder to jump the arc, compounding thermal stress on the coil packs and eventually leading to complete component failure and a flashing check engine light (CEL).

The Engineering Solution

This ignition coil and iridium spark plug kit resolves VQ25HR misfire issues by utilizing upgraded materials for superior thermal resistance and conductivity. The ignition coils feature high-grade dielectric epoxy and reinforced polymer housings that resist heat soak and prevent voltage leakage, ensuring maximum energy transfer. Paired with advanced iridium-tipped spark plugs, the system requires less overall voltage to generate a potent spark. The ultra-fine iridium center electrode resists electrical wear and oxidation, maintaining a precise spark gap over a significantly longer service life. This combination optimizes the air-fuel combustion sequence, resolving hesitation under load and preventing unburned fuel from reaching the exhaust tract.

Technical Specifications

Compatibility

• 2011 Infiniti G25 Base Sedan 4-Door 2.5L V6
• 2011 Infiniti G25 Journey Sedan 4-Door 2.5L V6
• 2011 Infiniti G25 X Sedan 4-Door 2.5L V6
• 2012 Infiniti G25 Base Sedan 4-Door 2.5L V6
• 2012 Infiniti G25 Journey Sedan 4-Door 2.5L V6
• 2012 Infiniti G25 X Sedan 4-Door 2.5L V6

The Infiniti Precision Standard

Engineered to meet the precise tolerances of Japanese luxury vehicles, this ignition kit ensures your V36 chassis operates without intermittent misfires or erratic CEL triggers, delivering the smooth, linear power band expected from the VQ platform.