Universal MPFI Coil On Plug Main Harness

The Universal MPFI Coil On Plug Main Harness from Holley is essential for modern EFI ignition systems, designed for builders and mechanics converting vehicles to multi-point fuel injection with coil-on-plug architecture. This harness effectively routes power and signal pathways from the engine control unit to individual coil packs mounted directly on spark plugs, eliminating the need for traditional distributors and high-voltage spark plug wires.

The harness is engineered to minimize electromagnetic interference and voltage drop across ignition circuits, which are critical for maintaining consistent spark timing under load. Holley's design philosophy emphasizes signal integrity, utilizing proper gauge conductors and shielded pathways to ensure precise control of each coil pack by the ECU. The main harness serves as the distribution trunk, branching out to individual coil connectors with organized wiring that avoids heat sources and moving engine components.

This modular approach simplifies diagnostics and allows for staged installation, enabling verification of each coil's function before finalizing the engine bay. Ideal for engine swaps, EFI conversions, and performance builds, this universal harness is compatible with most MPFI applications requiring individual coil control, making it a versatile choice for automotive enthusiasts.