Engine BMW M43B18 under the hood

Engine BMW M43B18

The BMW M43B18 engine began production in 1992, the engine has a cylinder capacity of 1796 cc and a power of 115 horsepower at 5500 rpm and 168 Nm at 3900 rpm. BMW engines of this series use the Bosch Motronic 1.7.1 fuel injection system. The red mark on the tachometer is indicated at 6200 rpm. These engines were used from 1992 to 1998 on the BMW E36 318i models. From 1994 to 1996 on BMW E34 518i and from 1995 to 2001 on BMW E36 Z3 1.8 models.


Manufacturer Steyr Plant
Also called M43
Production years 1992-2001
Cylinder block alloy cast iron
Fuel system injector
Configuration inline
Number of cylinders 4
Valves per cylinder 2
Piston stroke, mm 81
Cylinder bore, mm 84
Compression ratio 9.7
Displacement, cc 1796
Power output, hp 115/5500
Torque output, Nm / rpm 168/3900
Fuel type 95
Euro standards Euro 2-3
Weight, kg 133
Fuel consumption, L/100 km (for 318i E36)
— city
— highway
— combined
Oil consumption, gr/1000 km up to 1000
Recommended engine oil 0W-30 / 0W-40 / 5W-30 / 5W-40 / 10W-40 / 15W-50
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 M43B18The problems of the M43B18 engine are the appearance of noise, oil leaks, dips during acceleration, and intermittent motor operation.

If you notice constant noise, knocking and crackling in the power unit, it is necessary to check the integrity of the DISA damper. To restore the operation of the intake, an appropriate repair kit is required. Sometimes a knock is caused by hydraulic lifters, rocker arms.

When the oil is quickly consumed, a leak is observed, check the valve cover. To eliminate the leak, it is enough to replace the KVKG or gasket with sealant.

Among the problems in the operation of the power unit, unstable speed is noted that occurs when the air duct is damaged. Air leaks are possible, you should also inspect the lambda probe, KXX, throttle valve, DMRV. The reason may be problematic camshaft rotation.

Dips when picking up speed cause dirty injectors, it is enough to clean them.

The cause of overheating is the failure of the pump, radiator, thermostat. Also check the cooling system for air pockets, which are eliminated by blowing. If the engine will not start, inspect the spark plugs, the gas pump, the ignition coil, and the wires.

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