Ignition Coil + Iridium Spark Plugs for Subaru Impreza (1993-1997) 1.8L

Direct-Fit Ignition Coil and Iridium Spark Plug Kit for 1993-1997 Subaru Impreza

What it Does: The ignition coil and iridium spark plug kit restores secondary ignition voltage and consistent flame-kernel propagation on the 1993-1997 Impreza to eliminate cylinder misfires and restore throttle response.

The Stock Subaru Impreza Secondary Ignition Breakdown

The aging factory waste-spark coil pack mounted to the center of the intake manifold on the EJ18 suffers from chronic thermal fatigue and potting compound breakdown. Over decades of heat cycling, internal winding insulation degrades, introducing micro-arcing and secondary winding resistance drift. Paired with worn factory copper core plugs that suffer from rapid electrode erosion and widened spark gaps, the ignition system demands higher breakdown voltage than the tired coil can supply under load. This manifests as hesitation under load, unburnt hydrocarbon build-up, carbon tracking, and intermittent misfires across cylinders.

The Engineering Solution

This comprehensive service kit replaces the tired central coil pack and installs fine-wire iridium spark plugs designed to lower ignition voltage requirements. The direct-fit replacement ignition coil features high-dielectric epoxy encapsulation and high-grade copper primary and secondary windings to resist internal thermal breakdown and voltage leakage under peak operating temperatures. The included 4 iridium spark plugs utilize laser-welded fine-wire center electrodes paired with platinum ground pads. This ultra-dense electrode material resists electrical erosion and oxidation, delivering stable quenching characteristics, sharper flame front expansion, and reliable combustion pressure in the boxer combustion chamber.

Technical Specifications

Compatibility

• 1993-1997 Subaru Impreza Base 1.8L
• 1993-1997 Subaru Impreza L 1.8L
• 1993-1997 Subaru Impreza Outback 1.8L

Frequently Asked Questions

Does this fit the GC / GF Impreza?
Yes, this is a direct fit for the 1993-1997 Subaru Impreza equipped with the EJ18 engine.

Do these iridium plugs require gapping before installation?
No, iridium plugs come pre-gapped, and manual adjustments can fracture the brittle, fine-wire center electrode.

The Subaru Performance Caliber

Preserve authentic flat-four throttle response and smooth low-end torque with direct replacement ignition hardware built to withstand rigorous Boxer heat profiles.