Why does the cylinder extend but not retract?

[McEmilio]

Cylinder extending but not retracting is generally caused by spark plug failure, excessive fuel injection, or insufficient cylinder pressure. It is recommended to visit a 4S shop for inspection and troubleshooting as soon as possible. Below is relevant information about automotive engine cylinders: 1. Classification: Engine cylinders can be categorized based on their arrangement into L-type in-line, V-type, H-type horizontally opposed engines, and W12/16-type engines. Engine displacement equals the sum of the working volumes of all cylinders. Increasing the number of cylinders can increase engine displacement, enhance engine output power, and also make the engine run more smoothly, reducing vibration and noise. 2. Number of cylinders: Common cylinder counts for automotive engines include 3, 4, 5, 6, 8, 10, and 12 cylinders, with 4-cylinder and 6-cylinder engines being the most common, and 4-cylinder engines being the most widely used. Nowadays, engines with displacements below 1.3 liters often use 3 cylinders, 1.5 to 2.5 liters typically use 4 cylinders, around 3 liters usually have 6 cylinders, around 4 liters have 8 cylinders, and those above 5.5 liters use 12-cylinder engines.