What is the reason for the engine's stuck start?

(1) Causes of oil supply system: the low-pressure oil circuit is blocked, the pipeline is loose and leaks oil, the high-pressure oil pipe has air, the technical condition of the injector is poor, and the injection timing angle is incorrect.

(2) Starter causes: power failure, poor contact of electromagnetic switch, poor contact between commutator of starter motor and brush, and clutch slipping of starter transmission mechanism.

(3) Insufficient compression pressure of the cylinder: the cylinder gasket is damaged and leaks, the valve is irregularly closed and leaks, and the piston cylinder liner is worn and leaked.

(4) Insufficient air intake: the air filter element is blocked.