Compression check
1. Warm up the engine well. Then turn it off.
2. Relieve the fuel pressure. See chapter Engine management system.
3. To prevent fuel injection during measurement, remove the fuse (1) of the fuel pump.
4. Remove the engine cover. See section "Upper part of the intake manifold".
5. Remove the ignition coils and remove the spark plugs from all cylinders. See the sections "Ignition coil" and " Spark plug (with platinum tip)".
6. Connect the tachometer (not required when using CONSULT-II tester).
7. Screw the compression gauge (B) into the spark plug hole using the adapter (suitable special tool) (A).
Use a compression tester adapter with a tip diameter of less than 20 mm. Otherwise, it may get stuck in the cylinder head when unscrewing.
8. Fully depress the accelerator pedal, turn the ignition key to the "START" position and turn the crankshaft. When the compression gauge needle settles, read the compression pressure and engine speed. Repeat the measurements on all cylinders
Compression pressure: kPa (kg/cm²) / rpm
| Standard | Minimum | Maximum cylinder spread |
| 1510 15,4)/200 | 1265 12,65/200 | 98,1 (1,0)/200 |
Caution: Always use a fully charged battery to achieve the required engine speed.
If the engine speed is different from the norm, check the specific gravity of the electrolyte in the battery. Check the engine speed again with the normal density of the electrolyte.
If the compression pressure is below the minimum value, check the valve clearances and combustion chamber related components (valve, valve seat, piston, piston ring, cylinder walls, cylinder head, cylinder head gasket). After checking, measure the compression again.
If some cylinders have low compression, pour a small amount of engine oil into the spark plug hole of that cylinder and recheck the compression.
If the compression increases after adding engine oil, the piston rings may be worn or damaged. Check the piston rings and replace if necessary.
If the compression pressure remains low despite adding engine oil, the valves may be faulty. Check for damage to the valves. Replace the valve or valve seat, respectively.
If the compression pressure in two adjacent cylinders is low and remains low even after adding engine oil, there is a gasket leak. In this case, replace the cylinder head gasket.
9. After completing the inspection, install the removed components in the reverse order of removal.
10. Start the engine and make sure it runs normally.