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Holley 558-315 Features:
Coil harness for 99-04 4 Valve Ford Modular (4.6 & 5.4L) Engines.Complete 1999-04 Ford Modular Engine Plug and Play Engine Control Kit - Uses Jetronic ''Bosch Style'' injector harness & Bosch Wideband O2
Looking for a plug and play kit for your Ford Modular engine? The HP ECU allows you to accurately control the fuel and ignition of your engine plus much more! Is your cam too wild for a MAF? Power adders? You name it, and Holley EFI can handle it. Holley HP EFI systems are equipped with 4 programmable inputs and 4 programmable outputs that are ideal for most vehicles with a single power adder. This feature allows the user to configure the system to support a wide range of controls including boost control, progressive nitrous, water/meth injection, speed inputs, fuel pump control, AC inputs, timing retard inputs and various other uses.
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When selecting an ECU, users need to ensure their planned controls can be run with the 4 inputs and 4 outputs as certain combinations may use more inputs/outputs than are available. If more inputs/outputs are required, users should choose the Dominator ECU. ECU is certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance.Features:
- Designed specifically for 1999-2004 Ford Modular Engines
- Plug and play with factory sensors; crank, cam, TPS, coolant temp, etc.
- Plug and play with factory actuators; coils, injectors, IAC
- Connectors for Holley fuel pressure and oil pressure sensors
- Connectors for expanded inputs and outputs
- Complete plug and play kit includes HP ECU, Bosch wideband O2 sensor, MAP sensor, coil drivers and all necessary harnesses
Unlock modern tuning control for your Ford Modular engine with the Holley Complete HP EFI ECU & Harness Kit—an all-in-one solution designed for high-performance builds running 4.6L or 5.4L 2V/4V engines. Whether you're tackling a restomod, drag project, or street performance upgrade, this kit delivers seamless integration and race-ready control in one powerful package.
This system includes Holley's proven HP EFI ECU and a complete wiring harness tailored to Ford's 2V and 4V Modular engines. Designed for easy installation and maximum flexibility, it offers plug-and-play connectivity for sensors, injectors, coils, and more—making it an ideal Ford 4.6 stand alone harness solution for engine swap and custom applications.
The 4.6 2V stand alone ECU gives tuners full access to advanced features like real-time tuning, nitrous control, boost management, data logging, and wideband O2 compatibility. Whether you're running naturally aspirated or forced induction, Holley's software interface is intuitive and powerful, putting complete engine management at your fingertips.
Perfect for enthusiasts looking to ditch factory limitations, this kit simplifies engine control and expands tuning potential without unnecessary complexity. It's engineered specifically for performance-minded builders who need precision and reliability—backed by Holley's reputation for excellence.
From track day warriors to street machines, the Ford 4.6 stand alone harness and HP EFI ECU combo provides everything you need to tune your Modular-powered project for optimal performance. Start faster, run smoother, and tune smarter with Holley.
