Execution sequence
1. We prepare the car for work (see "Vehicle preparation for maintenance and repair").
2. We warm up the engine to operating temperature and turn off the ignition.
3. We turn out the spark plugs (see "Spark plugs - condition check and replacement").
4. We install the compression gauge in the spark plug hole of one of the engine cylinders.
5. The assistant presses the pedal to the stop "gas", by fully opening the throttle and turning on the starter for 5-10 seconds.
6. We write down or remember the readings of the device.
Similarly, we measure the compression in the remaining cylinders.
For a serviceable engine, the compression in the cylinders must be at least 1.0 MPa (10 bar), and the difference in compression between the cylinders is no more than 0.1 MPa (1.0 bar).