What's the matter with the Focus not starting?

[VanAdalynn]

There may be a problem with the engine. The following describes common starting faults in cars: 1. Idling operation problems: It may be unstable idling, engine shaking, idling speed exceeding the upper limit, idling speed lower than the lower limit, or rough idling. These phenomena are related to faults or poor operation of components such as the injector, oxygen sensor, air flow sensor, and exhaust gas recirculation valve. 2. Abnormal exhaust pipe smoke: There may be black smoke, white smoke, or blue smoke. Black smoke indicates an overly rich mixture, related to defects in the fuel supply, air distribution, mechanical, or electronic control system; white smoke indicates excessive water in the fuel; blue smoke indicates oil burning.