Ignition Coil and Iridium Spark Plugs for Acura RL (2005-2008) 3.5L

Direct-Fit Ignition Coil and Iridium Spark Plug Service Kit for 2005-2008 Acura RL

What it Does: The ignition coil and iridium spark plug kit replaces degraded factory ignition components on the 2005-2008 Acura RL to restore factory spark energy, eliminate cylinder misfires, and stabilize idle quality.

The Stock Acura RL Thermal Degradation and Voltage Drop

The J35A8 engine in the second-generation RL packages its ignition coils tightly inside deep cylinder head wells. Over extended drive cycles, severe thermal cycling hardens the factory silicone boots, leading to dielectric breakdown and micro-arcing against the spark plug tube walls. Simultaneously, primary and secondary coil windings suffer resistance drift from thermal stress, starving the combustion chamber of full ionization voltage. Combined with eroded electrode gaps on aged factory plugs, this breakdown manifests as hesitation under load, erratic idle, reduced fuel efficiency, and random cylinder misfire codes (P0300–P0306).

The Engineering Solution

This complete ignition overhaul kit pairs six high-dielectric pencil coils with fine-wire iridium spark plugs to re-establish optimal flame kernel propagation. Each coil features premium copper winding with reinforced internal epoxy potting to resist thermal degradation and internal shorting. High-tear-strength silicone boots provide high voltage insulation against flashover. The matched iridium-tipped spark plugs feature ultra-fine center electrodes requiring lower striking voltage while resisting spark erosion under sustained high-RPM operation. Direct interchange compatibility aligns with OEM numbers 30520P8EA01, 30520P8ES01, and UF242.

Technical Specifications

Compatibility

• 2005 Acura RL 3.5L V6 (J35A8) Base Sedan
• 2006 Acura RL 3.5L V6 (J35A8) Base Sedan
• 2007 Acura RL 3.5L V6 (J35A8) Base Sedan
• 2008 Acura RL 3.5L V6 (J35A8) Base Sedan

Frequently Asked Questions

Does this fit the KB1 RL?
Yes, this is a direct fit for the 2005-2008 Acura RL equipped with the J35A8 engine.

Are the included iridium spark plugs pre-gapped for the J35 V6?
Yes, the plugs arrive factory-gapped to OEM specification, though checking gap clearance prior to threading into the aluminum head is standard shop practice.

The Acura Engineering Standard

Engineered for the high-revving VTEC valvetrain of the KB1 chassis, this system restores crisp throttle mapping and clean combustion to ensure your SH-AWD drivetrain receives immediate, linear power delivery across the entire rev range.