Ignition Coil + Spark Plugs for Honda Ridgeline (2006-2008) 3.5L

High-Output Ignition Coil & Denso Platinum Spark Plug Kit for 2006-2008 Honda Ridgeline (YK1)

What it Does: The ignition coil and Denso platinum spark plug kit replaces aged factory ignition components on the 2006-2008 Ridgeline to eliminate secondary voltage leakage, cure cylinder misfires, and restore combustion efficiency.

The Stock Honda Ridgeline Ignition Breakdown

The factory coil-on-plug setup on the 3.5L J35A9 engine sits recessed inside deep cylinder head spark plug tubes, exposing ignition coils to intense thermal cycling and oil vapor degradation. Over time, the OEM internal primary and secondary windings suffer dielectric breakdown, leading to insulation punch-through, erratic spark delivery, and persistent P0300 through P0306 misfire codes under load. Worn plug electrodes widen the spark gap, forcing weakened factory coils to operate past their breakdown voltage threshold, ultimately leading to unburned hydrocarbons and lost fuel economy.

The Engineering Solution

This complete ignition kit features direct-replacement coil-on-plug units engineered with high-dielectric epoxy potting and reinforced thermoplastic housings to resist thermal fatigue and eliminate internal arcing. Paired with laser-welded Denso platinum spark plugs, the system reduces the voltage required to jump the electrode gap, providing stable flame front propagation across the entire RPM band. The platinum center electrode resists erosion under sustained heavy engine loads, ensuring stable idle dynamics and clean throttle tip-in.

What's Included

• 6 High Performance Ignition Coils (Replaces UF400)
• 6 Denso Platinum Spark Plugs

Technical Specifications

Compatibility

• 2006 Honda Ridgeline 3.5L V6 (RT, RTS, RTL)
• 2007 Honda Ridgeline 3.5L V6 (RT, RTS, RTL, RTX)
• 2008 Honda Ridgeline 3.5L V6 (RT, RTS, RTL, RTX)

Frequently Asked Questions & Fitment Warnings

Does this fit the YK1 Ridgeline?

Yes, this is a direct fit for the 2006-2008 Honda Ridgeline equipped with the J35A9 3.5L V6 engine; it is not compatible with later 2009+ J35Z5 configurations.

Do I need secondary ignition plug wires with this kit?

No, the J35A9 relies entirely on individual coil-on-plug units; torque spark plugs to factory spec (13 lb-ft) and secure coil hold-down bolts hand-tight without over-torquing.

The Honda Truck Standard

Built to handle sustained payload hauling and trail towing, this direct-fit ignition overhaul kit preserves critical low-end torque output without triggering false ECU misfire thresholds.