The pressure difference between the individual cylinders must be max. 1.5 bar. If the pressure difference is more than 1.5 bar, then this is a sign of defective valves, worn piston rings or cylinder guides. If the wear limit is reached, the engine must be repaired or replaced.
The compression pressure should be: 10-14 bar for a 4-cylinder engine, about 12 bar for a 6-cylinder engine.
1. Warm up the engine to check compression. After reaching the operating temperature of the coolant, drive another 5 km to ensure sufficient engine oil temperature.
2. Raise the engine hood.
3. 1.8/2.0L engine: Switch off the ignition. Crankshaft Position Sensor (L5) disconnect from the PMS control unit.
4. 2.2/2.8L engine: switch off the ignition. Remove the cover of the control device behind the front wall of the body. Disconnect the plug (A) from HFM control unit (N3/4).
5. Remove all spark plugs.
6. Crank the engine several times with the starter to remove deposits and soot.
Warning! Set the transmission to the idle position and apply the parking brake. Do not lean over the engine while cranking: risk of injury!
7. Compression gauge (01) in accordance with the operating instructions, insert or screw in the stem (04) into the spark plug hole. Enter a new chart sheet (03), (02) intermediate piece.
8. Instruct the assistant to press the accelerator pedal to the stop and keep it pressed until the end of the test.
9. The engine should make about eight revolutions until the pressure rise is recorded by the measuring device.
10. Check all cylinders one by one and compare with nominal value.
11. Then insert the spark plugs.
12. With the ignition off, fit the crankshaft position sensor to the PMS or HFM control unit. Install the cover of the HFM control unit.
13. Close the hood.