What are the reasons why a Camry suddenly won't start?

[SanKira]

Here are the reasons why a Toyota Camry won't start: Fuel system issues: Severe carbon buildup in the engine can affect normal vehicle starting, and may also cause shaking during idling. This can be alleviated by cleaning the throttle body or intake pipes. Electrical system issues: Spark plug failure. Spark plugs work through high-voltage discharge. When the ignition coil sends pulsed high voltage to the spark plug electrodes, the high voltage breaks down the air-fuel mixture to create a spark, allowing the engine to start normally. Spark plugs are one of the most important components in a vehicle. Mechanical issues: Insufficient cylinder compression pressure. This can be caused by: leakage between the cylinder head and cylinder block; leakage between the spark plug gasket and cylinder head or faulty decompression valve; crankcase leakage; or leakage due to severe wear between piston rings and cylinder walls or stuck piston rings.