ECS Tuning S85 Ignition Service Kit

Designed with the do-it-yourself enthusiast in mind, this comprehensive kit includes everything you need to overhaul your ignition system! By providing it all for you in a single click, we've made it easier than ever to get the quality replacement matching components you need when servicing your ignition system.

If you're experiencing misfires, poor fuel economy, reduced engine power, or ignition-related DTCs, a failing ignition coil is the likely culprit. Late-model BMWs utilize a coil-on-plug ignition system, with each cylinder receiving its own coil and spark plug to ensure efficient ignition. When an ignition coil fails, its corresponding cylinder receives no spark and begins to misfire. A misfiring engine may stumble at idle, hesitate upon acceleration, or emit an unpleasant fuel smell due to unburnt gasoline exiting the combustion chamber.

The S85's MSS65 DME uses a unique ignition system known as "Ionic Current Control". During engine development, BMW realized that standard knock sensors were insufficient for observing pre-ignition and misfires on a high-revving ten-cylinder engine. In lieu of standard knock sensors, Ionic Current Control uses each spark plug as a current probe, applying a low voltage to the electrode immediately after the power stroke and sending the resulting current to the Ionic Current Control Unit (ISS) for evaluation. To accomplish this, the S85 used a modified "pencil" style ignition coil, which eliminated the Zener diode in the secondary winding for accurate current measurement. These ignition coils are manufactured to the exact specifications of the OE Ionic Current Control-compatible ignition coil, and will not trigger ignition-related fault codes in the DME.

Bavarian Autosport ignition coils are designed to provide a reliable, long-lasting spark and are an exact fit for your S85-equipped E60 M5, E63 M6, or E64 M6. These high-quality OE replacements are constructed from durable, temperature-resistant plastic and feature high-quality rubber spark plug boots. Each boot is pre-lubricated with high-grade dielectric grease, ensuring easy installation and eliminating potential corrosion.

FEATURES

• Bavarian Autosport Ignition Coils - Set of Ten
  • Durable, temperature-resistant plastic construction is designed to withstand extreme heat and harsh conditions, ensuring long-lasting performance.
  • High-quality rubber spark plug boots are pre-lubricated with dielectric grease to prevent moisture intrusion and potential corrosion.
  • Built to meet or exceed OE manufacturing standards, guaranteeing a perfect fit, reliable performance, and seamless installation.
• NGK 4471 LKR8AP Spark Plugs - Set of Ten
  • Multi-ground electrodes improve ignition capability and are less sensitive to increased voltage use with gap growth.
  • Corrugated ribs prevent flashover.
  • Copper core aids in heat removal.
  • Pre-gapped to 0.035" (0.9mm)
  • OEM-specified spark plug for all S85 applications.