The BMW M43B19 engine, better known as the M43TU, is the largest of the lineup and has a displacement of 1.9 liters (1895 cc). A distinctive feature of these power units is the use of the proprietary fuel injection system BMW BMS 46. There are two modifications with different power levels.
Specifications
| Manufacturer | Steyr Plant |
| Also called | M43 |
| Production years | 1998-2002 |
| Cylinder block alloy | cast iron |
| Fuel system | injector |
| Configuration | inline |
| Number of cylinders | 4 |
| Valves per cylinder | 2 |
| Piston stroke, mm | 83.5 |
| Cylinder bore, mm | 85 |
| Compression ratio | 9.7 |
| Displacement, cc | 1895 |
| Power output, hp | 105/5300 118/5500 |
| Torque output, Nm / rpm | 165/2500 180/3900 |
| Fuel type | 95 |
| Euro standards | Euro 3 |
| Weight, kg | 138 |
| Fuel consumption, L/100 km (for 318i E46) — city — highway — combined |
11.0 6.0 8.0 |
| Oil consumption, gr/1000 km | up to 1000 |
| Recommended engine oil | 0W-30 / 0W-40 / 5W-30 / 5W-40 |
| Engine oil capacity, liter | 4.0 |
| Oil change interval, km | 7000-10000 |
| Normal engine operating temperature, °C | 90-95 |
| Engine lifespan, km — official information — real |
— 300+ |
Frequent problems
The main problems of the BMW M43B19 engine are oil leaks, engine knocking and crackling, unstable rpm, dips when accelerating.
If there is noticeable noise, knocking and crackling in the engine, it is worth checking the integrity of the DISA damper and, if necessary, use a repair kit to put the intake system in order. Sometimes rocker arms or hydraulic lifters cause knocking.
Oil leaks are caused by the valve cover. To eliminate the breakdown, it is necessary to install a new gasket and KVKG.
Dips when picking up speed are usually caused by dirty injectors that need to be cleaned.
Instability of revolutions provoke breakdowns of the air duct on the mass air flow sensor; air leaks are not excluded. If everything is in order with these elements, check the lambda probe, throttle valve, DMRV and KXX. Difficulty turning the camshaft can also cause floating rpm.
If you experience overheating, you should inspect the pump, radiator, thermostat and cooling system for air pockets. When the engine does not start, check the spark plugs, the gas pump, the ignition coil and high-voltage wires.
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