Engine BMW M43B19 / M43TU

Engine BMW M43B19/M43TU

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.


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
Torque output, Nm / rpm 165/2500
Fuel type 95
Euro standards Euro 3
Weight, kg 138
Fuel consumption, L/100 km (for 318i E46)
— city
— highway
— combined
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


Frequent problems

Engine BMW M43B19 / M43TU under the hoodThe 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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