- assistant;
- compression gauge.
Compression test sequence
1. We prepare the car for work (see item 2a "Preparing the car for maintenance and repair").
2. We warm up the engine on the car to operating temperature and turn off the ignition.
3. We take out the fuse of the computer and the circuits of the engine management system (see "Relays and fuses of the engine management system").
4. Turn out the spark plugs (see "Spark plugs - replacement").
5. We install a compression gauge in the spark plug hole of one of the engine cylinders.
6. Fully open the throttle.
7. The assistant turns on the starter for 5-10 seconds.
We remember or write down the readings of the compression gauge.
Similarly, we measure the compression in the remaining three 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).