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What causes your Nissan Almera b16 year 2003 engine qg16 to cut off after starting?

Several factors could cause your Nissan Almera, model B16 - Year 2003, with engine QG16, to cut off after starting. Here are some possible causes:

1. Fuel System Issues:

- Clogged Fuel Filter: A dirty or clogged fuel filter can restrict fuel flow to the engine, causing it to stall.

- Faulty Fuel Pump: A failing fuel pump may not provide enough fuel pressure, resulting in engine cutoff.

2. Ignition System Problems:

- Faulty Spark Plugs: Worn or damaged spark plugs can lead to misfires and engine stalling.

- Ignition Coil Failure: A malfunctioning ignition coil may not generate the necessary spark to ignite the fuel mixture, causing the engine to shut down.

3. Air Intake Issues:

- Clogged Air Filter: A blocked air filter can limit the airflow to the engine, leading to a lean fuel mixture and engine cutoff.

- Air Intake Leaks: Leaks in the air intake system can also disrupt the fuel-air mixture, causing engine stalling.

4. Electrical Problems:

- Loose Battery Connections: Poor battery connections can lead to voltage drops and insufficient power supply to the engine's electrical components.

- Defective Crankshaft Position Sensor: A faulty crankshaft position sensor can provide incorrect signals to the engine control unit, causing the engine to stall.

5. Engine Mechanical Problems:

- Low Engine Oil: Insufficient engine oil can cause lubrication issues and engine damage, leading to engine cutoff.

- Engine Overheating: Extreme engine temperatures can trigger safety mechanisms to shut down the engine.

6. Immobiliser Issues:

- Faulty Immobiliser: Some Nissan models have immobilisers that can malfunction and prevent the engine from starting or can cause it to cut off after starting.

7. Computer Issues:

- ECU Faults: Malfunctions within the Engine Control Unit (ECU) can cause various engine problems, including sudden shutdowns.

To identify the specific cause in your case, it's recommended to have a qualified mechanic diagnose the issue using appropriate diagnostic tools.