Starting fuel: Pre-injection
WARNING: This page is about a different car, the 2003 Saab 9-3 and 2002 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition is turned on, the fuel pump relay will operate for one second to build up fuel pressure.
As soon as the control module detects the crankshaft moving, there will be a simultaneous injection with all four injectors. The amount of fuel injected depends on the engine coolant temperature.