Ignition Coil and Iridium Spark Plugs for Acura RLX (2014-2020) 3.5L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 2014-2020 Acura RLX

What it Does: The ignition coil and iridium spark plug kit replaces degraded factory ignition hardware on the 2014-2020 Acura RLX to restore combustion efficiency, eliminate misfire codes, and maintain smooth throttle response.

The Stock Acura RLX Ignition Breakdown

In the transverse 3.5L engine bay of the RLX, thermal stress heavily impacts the ignition system. The rear cylinder bank is trapped against the firewall, subjecting coil packs to excessive heat soak. Over time, factory coil insulation degrades, leading to dielectric breakdown and micro-arcing within the boots. Compounding this, aged spark plug electrodes experience gap widening from continuous high-voltage discharge. This gap erosion strains the coil-on-plug modules, causing sluggish acceleration, rough idle, poor fuel economy, and eventual multi-cylinder misfires (DTC P0300–P0306).

The Engineering Solution

This service kit resolves secondary ignition collapse by utilizing high-conductivity copper windings potted in vacuum-sealed epoxy to prevent thermal-shock degradation. The replacement boots use high-temp silicone compounds that resist flashover voltage. Paired with fine-wire iridium spark plugs featuring trivalent metal plating to prevent thread seizure in aluminum cylinder heads, this kit ensures a stable spark kernel under demanding load conditions, matching factory dwell settings and keeping the engine running within proper AFR targets.

Technical Specifications

Compatibility

• 2014-2020 Acura RLX Base 3.5L V6 (J35Y4 / KC1)
• 2014-2020 Acura RLX Technology Package 3.5L V6 (J35Y4 / KC1)
• 2014-2020 Acura RLX Advance Package 3.5L V6 (J35Y4 / KC1)
• 2014-2020 Acura RLX Sport Hybrid SH-AWD 3.5L V6 (J35Y4 / KC2)

Frequently Asked Questions

Does this fit the KC1 / KC2 RLX?
Yes, this is a direct fit for the 2014-2020 Acura RLX equipped with the J35Y4 engine.

Do these iridium plugs come pre-gapped?
Yes, these plugs are pre-gapped to OEM specification, requiring no adjustment prior to installation.

The Acura Caliber

The J-series powertrain relies on clean combustion to maintain its smooth torque delivery and VTEC engagement across the entire powerband.