Description & Operation: Notes

The Multi-Point Injection system (MPI) is a computerized emission and fuel control system. The MPI system controls fuel delivery, ignition timing and idle speed. The system is designed to lower exhaust emissions while maintaining good driveability.

The Electronic Control Unit (ECU) is the organizer of the MPI system. The ECU determines at which point each injector supplies fuel. The ECU also controls many of the fuel and ignition related systems to constantly adjust engine operation. The MPI system consists of the following subsystems: Air/Fuel Ratio Control, Ignition Timing Control, Idle Speed Control (ISC), Fuel Pressure Control and Purge Control.