ME-SFI vehicle features - AH07.61-P-0002-02M
WARNING: This page does not describe the selected car, but rather 202 other vehicles, including the 2020 Mercedes-Benz SLC300, 2020 Mercedes-Benz SL550, 2020 Mercedes-Benz SL450, 2020 Mercedes-Benz GLA250, and 2019 Mercedes-Benz SLC300. However, it is still accessible from the selected car via links, so may be relevant.
Comparison of engine 137 and engine 120
| Engine 137 | Engine 120 |
|---|---|
| ME 2.7 fuel injection and ignition system | ME 1.0 fuel injection and ignition system |
| One fuel injection system for both banks of cylinders, ME-SFI control module (N3/10) | Two separate fuel injection systems, one for each bank of cylinders, ME-SFI control module (N3/11, N3/12) |
| EURO4 emission concept standard (no code) |
EURO2 or "D3" emission concept (code 923) |
| Throttle valve actuator, camshaft Hall sensor, coolant temperature sensor, crankshaft position sensor fitted only once in each case | Throttle valve actuator, camshaft Hall sensor, coolant temperature sensor, crankshaft position sensor fitted twice (once for each bank of cylinders) |
| Hot film mass air flow sensor with integrated intake air temperature sensor | A hot film mass air flow sensor and intake air temperature sensor for each bank of cylinders |
| ECI ignition system (alternating voltage ignition system with integrated ionic current measurement) | DI ignition system |
| Combustion misfiring detected by ionic current signals, sensor rotor adaptation not required | Combustion misfiring detected by smooth running analysis with crankshaft position sensor, sensor rotor adaptation required |
| No knock sensors, knocking detected by ionic current signals | 4 knock sensors |
| Two spark plugs for each cylinder with double ignition | One spark plug for each cylinder |
| Fuel system designed as single-line system, fuel filter with integrated diaphragm pressure regulator | Fuel system with fuel return flow from diaphragm pressure regulator at distribution pipe |
| Total of 8 O2 sensors, upstream and downstream of each of the 4 bulkhead catalytic converters | 2 O2 sensors upstream of both underfloor catalytic converters |
| Each O2 sensor heater with own output stage in ME-SFI control module | Parallel circuit for each bank of cylinders |
| Cylinder shutoff: left bank of cylinders is shut off at idle speed and if power demand low, to safe fuel | - |
| Oil pressure sensor downstream of secondary oil pump for cylinder shutoff | - |
| Variable camshaft timing with engine oil pressure, 2 camshaft adjustment valves (Y49/1, Y49/2) | Inlet camshaft adjustment by means of solenoids |
| Secondary air injection with electric air pump (M33) | Belt-driven air pump with electromagnetic clutch |
| Secondary air injection for each bank of cylinders operated individually, 2 air pump switchover valves (Y32/1, Y32/2) | Secondary air injection, both banks of cylinders operated together |
| Only one purge control valve | One purge control valve for each bank of cylinders |
| Camshaft Hall sensor detects segment position when engine not running | Camshaft Hall sensor detects segment position only when engine running |
| Pedal value sensor integrated in accelerator pedal module | Pedal value sensor in component compartment |
| Pressure sensor (intake manifold) | Pressure sensor (intake manifold) only |
| Starter control by means of starter relay (touch start) | Through ignition/start switch |
| DAS 3 | DAS 2 |
| Engine/AC electric suction fan with integrated control actuated directly by ME-SFI control module | Belt drive and viscous fan clutch |
| Oil sensor (oil level, oil temperature and oil quality) screwed from below into oil pan | Oil level sensor |
| Exhaust flap in exhaust pipe for cylinder shutoff | - |
| Sheet steel exhaust manifold with air gap insulation | Sheet steel exhaust manifold |
| 3 valves for each cylinder | 4 valves for each cylinder |
| One camshaft for each bank of cylinders | Two camshafts for each bank of cylinders |
| Roller-type rocker arm | Bucket tappets |
| Engine oil - coolant heat exchanger | - |