BMW 318i
Bored-out M43 with slightly more displacement. Solid basis for everyday use with low maintenance requirements.
Underpowered
118 hp is not enough for motorway or spirited driving β best suited to city use.
Engine Weaknesses 5
Timing cover gasket is the most common source of oil loss in the entire M43 family. Identical on the M43B19 to the M43B18. Cylinder head removal is usually unavoidable, making the repair expensive.
Symptoms: Oil patches under the vehicle, visible oil film on engine front face, oil smell after a long drive
Plastic coolant flanges on the M43B19 become brittle with age and crack or weep. Especially the rear flange on the cylinder head is vulnerable. Simultaneous replacement of all flanges strongly recommended.
Symptoms: Coolant loss without clear leak point, temperature fluctuations, slight coolant smell
The oil filter housing tends to leak at the gasket to the engine block from about 120,000 km. Oil drips onto the hot exhaust manifold and creates smoke.
Symptoms: Blue smoke under the bonnet, oil smell in the cabin, visible oil trail on engine block below the oil filter.
Idle control valve tends to foul on the M43B19 through oil mist. Rough cold running and fluctuating idle speed are typical consequences. Cleaning with brake cleaner often curative, otherwise replacement.
Symptoms: Fluctuating idle speed, hesitation after cold start, rough engine running at operating temperature
Ignition leads of the M43B19 become brittle with age and develop misfiring arcs, causing ignition misfires. Resistance should be approximately 6 kΞ©/m. Replacement with original or equivalent quality recommended.
Symptoms: Ignition misfires, hesitation at certain rev ranges, increased fuel consumption, poor starting
Vehicle Weaknesses 7
The cast rear trailing arms (swing arms) of the E36 rear axle are prone to corrosion and pitting near the spring seat. When severely affected the trailing arm must be replaced.
The viscous fan coupling loses its silicone oil over time and can no longer couple the engine fan adequately. In traffic or at low speeds, engine temperature rises rapidly into the red zone.
The rubber-metal barrel bearings (Tonnenlager) of the rear axle become porous and separate. Repair requires special tools and full rear axle disassembly. MOT-relevant when heavily worn.
Sills rust through almost universally β especially through blocked drain holes. Wheel arches rust from the inside along the flange joint, only visible once damage is already severe.
Water pump and thermostat are wear items. A faulty thermostat causes permanent under- or overheating; a failed water pump leads to coolant loss and engine damage.
The alternator voltage regulator and the EWS electronic immobiliser are classic weak points. The voltage regulator fails most often, rarely the whole unit. EWS can cause intermittent start failures.
Plastic sliders, motor brushes, and window regulator connectors fail frequently. BMW doesn't supply individual parts β only complete regulator mechanisms.