ECU & Wiring Harness LS1

The Holley ECU & Wiring Harness LS1 is a complete engine control module system designed for LS-series engine swaps and fuel injection conversions. This kit delivers plug-and-play EFI integration specifically tuned for LS1 and LS6 platforms, combining a standalone ECU with a comprehensive wiring harness and 24x reluctor wheel trigger system to eliminate the need for factory GM onboard diagnostics and simplify aftermarket engine management setup.

This complete LS1 ECU and wiring harness solution addresses the core challenge of LS engine swaps: integrating a modern fuel-injected engine without factory OBD systems. The 24x reluctor wheel provides reliable crank trigger detection, while the included harness connectors are engineered to interface directly with LS1 and LS6 fuel injectors, ignition coils, and sensors. At 10.7 lbs and compact dimensions, the system mounts cleanly in engine bays where space is constrained, and the comprehensive wiring eliminates guesswork during installation.

Builders performing LS engine swaps into non-GM platforms—whether street rods, truck conversions, or race applications—rely on standalone EFI systems to achieve reliable cold starts, smooth idle, and proper fuel mapping without factory computer dependencies. This Holley system is purpose-built for that workflow. It's equally suited for carbureted-to-fuel-injection conversions on existing LS installations where aftermarket engine management provides better throttle response and tuning flexibility than original equipment.

The LS1 and LS6 engines remain the go-to choice for affordable, high-displacement swap platforms. Holley's reputation in fuel injection and engine management ensures this ECU harness kit meets the precision demands of modern fuel delivery. Proper engine management is the foundation of any swap—throttle response, drivability, and fuel economy all depend on accurate sensor feedback and injector timing.