This main harness gives Ford MPFI-based engines a plug-and-play path to coil-on-plug ignition, with a pre-installed power tap for easy access to 12V, 5V reference, and sensor grounds. It's also pre-terminated for the stock pulse-width-modulated idle air control motor commonly found on fuel-injected Windsor 5.0L engines.
Specifications:
- Application: Ford MPFI, Coil-On-Plug conversion
- Color: Black
- Wire Gauge: 20 AWG or larger
- Additional Relay: 40 amp, for powering individual coils
- CAN Connectors: Dual CANbus connectors for multiple CAN devices
- Pre-Terminated For: Ford PWM IAC motor
- Compatible Sub-Harnesses: 558-312 or 558-318 Smart Coil sub-harnesses
- Part Number: 558-118
Multiple sensor wire lengths have been extended to accommodate various intake designs.
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
What engines is this harness built for?
Ford MPFI applications converting to coil-on-plug ignition, including fuel-injected Windsor 5.0L engines with a PWM idle air control motor.
What smart coil sub-harnesses does it work with?
The 558-312 or 558-318 Smart Coil sub-harnesses plug directly into this main harness.
What's the power tap used for?
It gives easy access to 12V, 5V reference, and sensor grounds without splicing into the main harness.
Is this legal for street use?
No, it's legal for Racing Use Only vehicles and can't be installed on emissions-controlled street vehicles.
