The car won't catch fire, and the spark plugs of the oil pump are all normal ... When taking a taxi, the throttle backfired and blew out without inhaling.

You can't keep doing this, can you? It only happens a few seconds after the starter is started. This is the wrong fuel burning time, too much oil supply and wrong oil supply time, which provides a reference for inspection.

The first step is to check the fuel.

Is the fuel pump working properly?

Is the injector working normally?

Check spark plug

Does the spark plug flash?

Check whether there is water in the fuel tank.

Judge the timing. Just mechanical adjustment.

Electronically check those sensors on the cylinder lines and the engine.

This should start the engine.