What is the method for testing with a cylinder pressure gauge?

[MaciFitz]

Cylinder pressure gauge testing method: 1. First, use compressed air to clean the dirt around the spark plugs; 2. Remove all spark plugs. For gasoline engines, also disconnect the secondary high-voltage wires of the ignition system and securely ground them to prevent electric shock or fire; 3. Insert the conical rubber tip of the dedicated cylinder pressure gauge into the spark plug hole of the cylinder being measured, ensuring it is properly aligned and tightly secured; 4. Fully open the throttle and use the starter to rotate the crankshaft for 3 to 5 seconds (no fewer than 4 compression strokes). Stop rotating once the pressure gauge needle indicates and maintains the maximum pressure reading; 5. Remove the pressure gauge, record the reading, and press the one-way valve to reset the gauge needle to zero. Repeat this process for each cylinder, ensuring each cylinder is tested at least twice. Take the arithmetic mean of the measurements for each cylinder, compare it with the standard value, analyze the results, and determine the working condition of the cylinder.