Industrial DR31 Automotive Ignition Coil Assembly

The CARQUEST DR31 ignition coil assembly is a coil-on-plug (COP) ignition coil designed to replace DR31-type COP coils in engines that use the DR‑31/DR31 coil format. This single-coil module mounts directly over the spark plug, delivering the high-voltage spark required by modern ignition systems with fewer external connections than traditional distributor setups. The DR31 designation appears in Standard Motor Products’ catalog and is also listed in Carquest’s DR31 lineups, reflecting cross-reference compatibility across common COP coil footprints and electrical connectors for straightforward installation. By integrating the coil and boot into a compact COP package, this assembly minimizes spark-path length and supports reliable ignition performance across typical operating conditions, contributing to smoother cold starts, stable idle, and responsive acceleration in vehicles designed for COP ignition coils.