The ME-SFI post-start enrichment function - GF07.61-P-3011V

ENGINE 272.920 in MODEL 203 up to Model Year 8

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203 up to Model Year 8

ENGINE 272.941 in MODEL 203 up to Model Year 8

ENGINE 272.942 in MODEL 171 up to Model Year 8

ENGINE 272.943 in MODEL 211, 219

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251 up to Model Year 8

ENGINE 272.946 in MODEL 221 up to Model Year 8

ENGINE 272.960 in MODEL 203 up to Model Year 8

ENGINE 272.963 in MODEL 171 up to Model Year 8

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221 up to Model Year 8

ENGINE 272.966 in MODEL 230 up to Model Year 8

ENGINE 272.967 in MODEL 164, 251 up to Model Year 8

ENGINE 272.970 in MODEL 203 up to Model Year 8

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221 up to Model Year 8

ENGINE 273.922 in MODEL 221 up to Model Year 8

ENGINE 273.923 in MODEL 164 up to Model Year 8

ENGINE 273.924 in MODEL 221 up to Model Year 8

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221 up to Model Year 8

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251 up to Model Year 8

ENGINE 273.965 in MODEL 230 up to Model Year 8

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221 up to Model Year 8

ENGINE 272.940 in MODEL 209

ENGINE 272.960 in MODEL 209

Shown on engine 272.963 in model 171

Fig 1: ME-SFI Post-Start Enrichment Function Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

After a cold start the fuel-air mixture is enriched for a short time. The fuel which precipitates on the cylinder walls and the intake manifold is compensated for by this enrichment and the engine runs smoothly. Torque converter protection of automatic transmission (e.g. 1400 RPM with no gear engaged (automatic transmission) at +30°C coolant temperature for about 30 s).

The post-start enrichment is dependent on:

Coolant temperature at start
Combustion cycles after start
Correction programming with STAR DIAGNOSIS

Fig 2: Post-Start Enrichment Rate And Time Graph

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Component description for the ME-SFI [ME] control unit	GF07.61-P-6000V
Component description for the fuel injection valves	GF07.03-P-6010V
Component description for the crankshaft Hall sensor	GF07.04-P-6220V
Component description for the coolant temperature sensor	GF07.04-P-6040V