Cold Start Control

During start phase, an increased quantity of fuel is injected 3 times for each cylinder group for up to 5 turns of the crankshaft. This function is dependent upon the engine temperature. The initial injected quantity is then reduced depending upon the temperature and engine speed in order to avoid an excessively rich mixture. If start is repeated within one minute, the complete initial quantity is no longer injected. After engine has started (at approximately 600 RPM) fuel is injected only once per turn of the crankshaft and cylinder group. This means that during the first turn fuel is injected in cylinders 2-4-6 and during the second turn in cylinders 1-3-5. Cylinders 8-10-12 and 7-9-11 are also supplied offset by 60 degree crank angle. During the warm-up phase up to an engine temperature of 158°F (70°C) the injection timing is also correspondingly extended, dependent upon the engine speed and temperature. These values are programmed in the control units.