When trying to start a cold engine, fuel condenses on the walls of the intake tract, taking longer to reach the cylinder. Pre-Crank Prime delivers fuel to the engine BEFORE it is cranked. This supplies additional fuel to wet the intake tract helping to ensure good starting at low engine temperatures. Do not confuse this with the First Crank setting which adds to the Crank Enrichment for the FIRST engine revolution delivering an additional enrichment just for the first revolution.
Pre-Crank Prime Settings
Sets the type of Pre-Crank Prime used:
·OFF - No Pre-Crank Prime
·Key On - The injectors will be opened for the time specified in the Pre-Crank Prime Time table each time the ECU is powered up.
·Ign Start Position - The injectors will be opened for the time specified in the Pre-Crank Prime Time table the first time the key is turned to the start position. This ensures that the prime fuel is not injected too early when the key is turned on, then turned to start some time later. This mode requires a Digital Input to be configured as Start Position and wired to the start terminal on the ignition switch.
Sets the time the injectors will be opened for. If only using the x table axis set the axis to Engine Coolant Temperature (ECT).
Note: There are four engine coolant temperature dependant functions which provide enrichment. These are Pre-Crank Prime, Crank Enrichment, Post-Start Enrichment and Warm-Up Enrichment. As a general rule, the correct warm-up enrichment value will be lower than either the crank enrichment or post-start enrichment.
