The EFI engine rang several times. What happened?

There are four reasons why the EFI engine rings several times.

1, because the throttle valve body is dirty, which affects air intake. It is necessary to clean the throttle body.

2. There is a lot of carbon in the engine intake, which affects the fuel injection and makes the engine difficult to run. This requires cleaning the engine air intake.

3. Insufficient battery power leads to insufficient speed of starting motor, which makes it difficult to start the engine.

4, spark plug aging, resulting in insufficient ignition energy, making the engine difficult to play.