ADAPTER 3768854 - Caterpillar

Electronic Control Module (ECM) provides automatic control of the engine's fuel to air ratio. This automatic control will achieve good engine performance, control of black exhaust smoke, and improved fuel consumption. The ECM regulates the fuel delivery. The fuel delivery is based upon the air inlet manifold pressure (boost). As boost pressure increases, more air is available for combustion in the cylinders. The ECM responds by delivering more fuel. More fuel is delivered in order to maintain the optimum air/fuel ratio throughout the engine's operating range.The engine's electronic control system allows you to make a slight adjustment of the fuel ratio control. Adjustment of the fuel ratio control in the ECM is accomplished by using the Caterpillar Electronic Technician (ET). Changing the "Fuel Ratio Control Offset" parameter allows custom tailoring of the fuel to air ratio. Setting the "Fuel Ratio Control Offset" value in the positive direction will provide a richer air/fuel ratio. This setting will yield a quicker engine response during accelerations. The setting will also yield more black smoke. Setting the "Fuel Ratio Control Offset" value in the negative direction will provide a leaner air/fuel ratio. The result is a somewhat slower engine response and less black smoke.