Ignition Coil + Spark Plugs for Mitsubishi Eclipse (1997-1999) 2.0L Non-Turbo

Direct-Fit Ignition Coil Pack and NGK Ruthenium Spark Plug Kit for 1997-1999 Mitsubishi Eclipse (D31A)

What it Does: The ignition coil pack and NGK Ruthenium spark plug kit replaces deteriorating factory ignition components on the 1997-1999 Mitsubishi Eclipse to eliminate misfires, restore lost combustion efficiency, and stabilize high-RPM spark output.

The Stock Mitsubishi Eclipse Waste-Spark Degradation

The naturally aspirated Chrysler 420A engine relies on a single dual-tower waste-spark ignition coil mounted directly above high-heat exhaust and cylinder head runners. Over decades of thermal cycling, the internal transformer potting dries out and develops micro-fractures in the secondary winding insulation. This thermal stress induces internal arc flashovers and secondary voltage drop under load, showing up as low-RPM hesitation, erratic idle, and ignition breakup near wide-open throttle. Concurrently, standard copper or aged platinum plugs suffer electrode erosion, widening the spark gap and forcing an already taxed coil to draw excessive primary amperage.

The Engineering Solution

This replacement pack features an epoxy-potted secondary winding resistant to thermal shock, ensuring constant dielectric strength and consistent dwell recovery across the entire rev range. Paired with NGK Ruthenium HX spark plugs, the assembly drops the required ionization voltage significantly. Ruthenium high-durability alloy tips resist spark erosion and oxidation under harsh combustion pressures far better than traditional iridium or platinum, maintaining a precise electrode gap. This restores crisp ignition timing, guarantees complete burn dynamics in the combustion chamber, and preserves primary circuit integrity across the powertrain control module (PCM).

Technical Specifications

Compatibility

• 1997-1999 Mitsubishi Eclipse RS 2.0L Non-Turbo (420A DOHC)
• 1997-1999 Mitsubishi Eclipse GS 2.0L Non-Turbo (420A DOHC)

Frequently Asked Questions

Does this fit the D31A Eclipse?

Yes, this is a direct fit for the 1997-1999 Mitsubishi Eclipse equipped with the 420A engine.

Does this kit include spark plug wires?

No, this service kit includes the 4-terminal waste-spark coil pack and four NGK Ruthenium HX plugs; high-tension ignition wires must be inspected or sourced separately.

The Mitsubishi Sport Compact Standard

Engineered to deliver clean, uncompromised spark delivery to the 2G Eclipse platform, restoring sharp throttle response, flat-out rev stability, and peak combustion efficiency without fault codes.