Arizona Speed and Marine has developed a MEFI 4 to Holley Programmable ECU Kit, to replace the obsolete MEFI 4 ECU.
Included is the Adapter harness designed to plug into your existing engine wiring harness where the MEFI 4 ECU was previously connected, with wide Band sensor and self-Learning capabilities.
You can make changes on the fly, real time, while monitoring the air/fuel ratio and transferring the self-learn table to the fuel base fuel table. This system has been used on multi-port normally aspirated and boosted engines. The adapter harness has provisions for the OEM small cap distributor, oil and fuel pressure transducers and CAN buss for Holley digital dashes. Engine temperature, or air/fuel ratio is out of safe operating perimeters are recorded by existing engine sensors, (Coolant temperature and Air temperature, MAP, TPS, IAC and RPM).