Cold Start Control

During cold engine cranking, additional fuel is injected 3 times, for the first 5 crankshaft revolutions, for each cylinder group. During start-up, the injected fuel quantity is reduced according to coolant temperature and engine speed in order to avoid a rich mixture. If a re-start is attempted within one minute, the complete initial quantity is no longer injected.

After engine has started (engine speed at about 600 RPM), fuel is injected only once per crankshaft revolution and cylinder group. Fuel is thus injected in cylinders No. 2, 4 and 6 during the first turn; cylinders No. 1, 3 and 5 during the second turn. During warm-up phase, up to an engine coolant temperature of 158°F (70°C), injector timing (pulse width) is also extended, depending on engine speed and temperature.