Fuel Delivery and Air Induction: Description and Operation

The fuel injection system used on these vehicles is of the multi-point pressure/speed type, which means that fuel delivery depends almost entirely on intake manifold pressure and engine speed.
The system is controlled by a digital microprocessor known as the electronic control unit (ECU), which is located on the left inner fender behind the shock tower. The ECU receives information from various input sensors and, based on this information, is programmed to provide the precise amount of fuel to meet existing engine speed and load conditions. In addition to fuel delivery, the ECU also calculates base ignition timing and spark advance, again using information from the various input sensors to adjust these values accordingly. As input signals to the ECU change, it acts in response to these signals by changing output device calibrations or values.