Fuel Injector

When fuel injector solenoid coil is energized by the ECM (on time), coil becomes an electromagnet. This opens the fuel injector, allowing fuel to be injected into the intake manifold or cylinder. The air/fuel mixtures are controlled by the fuel injector pulse width (on time). The ECM determines proper pulse width based upon input signals from various sensors and switches.

Fuel injection timing is determined by ECM based upon RPM signals received from either the distributor or ignition coil. Metro and Tracker models have Throttle Body Injection (TBI), which incorporates a single fuel injector in the throttle body unit. All other models use Port Fuel Injection (PFI), which incorporates fuel injectors mounted in a fuel rail assembly.