After start

Fig 1: Diagnostic Communication For Fuel Consumption

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Fuel Consumption Graph

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Directly after starting the engine, the correction factor is just over 1 and subsequently drops to 1.00. How far above 1 the correction factor reaches and how long it takes to return to 1.00 depends on the engine coolant temperature. This function is called the choke on cars with carburettor engines. Closed loop starting conditions are such that fuel enrichment after starting has just dropped to 1.00 when closed loop starts.