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To reduce air pollution by the exhaust gases from automotives, it is necessary to control air/fuel ratio appropriate to engine operating condition, which can be achieved by adopting an electronic control system. In this study we designed and fabracated PC-ECU (Personal Computer interfaced - Electronic Control Unit) to develop the automotive engine control system. PC-ECU is made to perform engine control with the application of various control logics instead of the C-ECU. As a first step to develop control logics we applied jump-ramp control to the real engine using a simple on/off O2 sensor and performed engine control by the use of PC-ECU. Also, we introduced a wide band O2 sensor instead of the simple on/off O2 sensor and adopted the PI control. The results show that the control performance in case of using a wide band O2 sensor is much better than in case of using a simple on/off O2 sensor.