Ignition Coil and Iridium Spark Plugs for Ford Focus (2003-2007) 2.3L

Direct-Replacement Ignition Coil and Iridium Spark Plug Kit for 2003-2007 Ford Focus

What it Does: Delivers high-dielectric secondary voltage and ultra-consistent arc timing to eliminate cylinder misfires, rough idle, and spark blowout across the entire rev range.

The Stock Focus Coil & Plug Degradation

Factory coil-on-plug (COP) boots and internal epoxy insulation on the C170 chassis degrade over sustained thermal cycles. This leads to dielectric breakdown, secondary winding voltage leakage, and carbon tracking. Concurrently, worn factory plugs experience gap erosion, forcing aging coils to draw higher primary amperage and increasing the risk of intermittent misfires under open-throttle engine load.

The Engineering Solution

This complete tune-up package integrates high-conductivity internal copper windings encased in reinforced thermal-resistant housings to maintain peak spark energy under heavy engine bay heat soak. Matched with fine-wire iridium spark plugs, the assembly lowers the required ignition voltage, enhances flame front propagation, and resists carbon fouling for consistent combustion efficiency.

Technical Specifications

Compatibility

• 2003-2007 Ford Focus ZX3 (2.3L DOHC 4-Cylinder)
• 2003-2007 Ford Focus ZX4 / ST (2.3L DOHC 4-Cylinder)
• 2003-2007 Ford Focus ZX5 (2.3L DOHC 4-Cylinder)
• 2003-2007 Ford Focus ZXW (2.3L DOHC 4-Cylinder)

The Ford Compact Performance Caliber

Engineered to restore factory throttle response, ensure stable cold-start ignition, and provide clean, complete fuel burn for your daily commuter or weekend track build without triggering false diagnostic trouble codes.