Ignition Coil and Iridium Spark Plugs for Mercedes Benz SLK-Class (2001-2004) 3.2L

Direct-Fit Ignition Overhaul Kit for 2001-2004 Mercedes Benz SLK-Class

What it Does: Completely refreshes the twin-spark secondary ignition system by replacing deteriorated coils and high-mileage plugs to eliminate misfires, restore lost combustion efficiency, and stabilize idle dynamics.

The Stock SLK-Class Twin-Spark Degradation

The Mercedes-Benz M112 3.2L V6 utilizes a dual-spark per cylinder configuration that places continuous thermal and electrical strain on its ignition components. Over extended heat cycles within the tight R170 engine bay, factory coil secondary windings develop high internal resistance and micro-cracking in the epoxy insulation. This dielectric breakdown leads to low-RPM hesitation, erratic spark scatter across the dual-plug sequence, and unburnt fuel fouling catalytic converters. Worn factory plug gaps also force aging coils to operate at saturated dwell times, accelerating overall primary circuit failure.

The Engineering Solution

This complete ignition overhaul system features six heavy-duty ignition coils paired with twelve fine-wire iridium spark plugs specifically calibrated for the M112 twin-spark firing pattern. Coils are engineered with high-grade copper windings and premium magnetic iron silicon cores to deliver a stable, high-energy spark across all operating RPMs. Direct-fit blade terminals eliminate contact resistance at the harness junction, while the laser-welded iridium electrode spark plugs resist thermal erosion and maintain precise gap tolerances under severe duty cycles.

Technical Specifications

Compatibility

• 2001-2004 Mercedes-Benz SLK-Class (SLK320) – 3.2L V6 Gas (M112.947), Chassis: R170

The Mercedes Benz Precision Standard

Engineered to meet strict European diagnostics tolerances, this kit prevents false diagnostic trouble codes (DTCs), clears persistent P0300-series multi-cylinder misfire faults, and ensures proper secondary voltage balance across the M112 valvetrain without triggering check engine lights.