Engine control in the vast majority of engines means regulating fuel and air intake as well as injection timing to achieve desired performance in the form of torque or output power. The present system of diesel engines uses mechanical control of fuel injection. The amount of fuel injected is controlled by the position of the rack. The limitations of the current system include excess quantity of fuel injection and starting problem. Here comes the idea of electronic engine control system. The motivation for this electronic engine control system came by virtue of two government requirements. The first was a thrust to improve the national average fuel economy by government regulation. The second came about as a result of legislation to regulate automobile exhaust emissions under the authority of the environmental protection agency. Hence, the main objectives of this experiment are fuel consumption and emission. In the electronic engine control system, sensors are used to monitor the engine parameters like engine crank position, engine load, etc. These details are fed into the electronic control unit and fuel is injected according to the pulse width generated. It is observed that a slight reduction in fuel consumption and emission values of Hydrocarbon (HC), Carbon monoxide (CO) and smoke. Nitrogen oxides (No<inf>x</inf>) emission is slightly increased. The advantages of this embedded control system are more precise control of fuel quantity injected, timely start of injection, and idle speed control. © EuroJournals Publishing, Inc. 2012. © 2014 Elsevier B.V., All rights reserved.