What is the ecm on 91 Z28?

The ECM (Engine Control Module) on a 1991 Chevrolet Z28 is a key component of the vehicle's engine management system. It processes data from various sensors to control fuel injection, ignition timing, and other critical engine functions to optimize performance and emissions. In this model, the ECM is part of the OBD-I (On-Board Diagnostics) system, which provides basic diagnostics to help identify engine issues. It plays a crucial role in ensuring the engine runs efficiently and reliably.