What are the reasons for a car engine failing to start?

[CarterAnn]

Reasons for a car engine failing to start: 1. Starting system failure, such as insufficient battery power, damaged starter, or faulty starter circuit; 2. Engine mechanical system failure, such as intake pipe leakage, poor sealing between piston and cylinder, poor valve sealing, excessive carbon buildup on intake valves and intake pipes, causing injected gasoline to be absorbed by carbon deposits and unable to enter the combustion chamber; 3. Engine management system failure, such as weak speed sensor signal, incorrect water temperature signal, poor line contact, etc.; 4. Ignition system failure, such as excessive carbon buildup or incorrect gap on spark plugs, high-voltage wire leakage, or damaged ignition coil.