Nissan Shi Gui engine cannot start skilled maintenance.

There may be many reasons why Nissan Shi Gui engine can't start. Here are some possible reasons and corresponding extended explanations:

1. Fuel problem: the fuel may be insufficient or the fuel supply system is faulty. This may be caused by fuel pump failure, fuel filter blockage or fuel pump relay failure. Solutions may include checking the working condition of the fuel pump, cleaning or replacing the fuel filter and checking the relay circuit.

2. Ignition problem: It may be that the ignition system failed to start. This may be caused by damaged spark plug, faulty ignition coil or faulty ignition module. Solutions may include checking the condition of spark plugs and replacing damaged parts.

3. Battery problem: It may be that the battery power is insufficient or the battery connection is poor, which makes it impossible to start. Solutions may include checking the battery charge, charging or replacing the battery, and ensuring that the battery is well connected.

4. Engine mechanical problem: It may be that engine parts are damaged or mechanical failure causes the engine to fail to start. This may involve the transmission system, valve mechanism or crankshaft of the engine. Solutions may include checking and repairing faults in engine mechanical parts.

It should be noted that these are only some possible reasons, and the specific reasons need to be carefully diagnosed and checked according to the actual situation. At the same time, engine maintenance needs professional knowledge and experience, and it is recommended to seek the help of professional automobile maintenance technicians.