Description
1. If you notice a loss of engine power or if you have misfires and the problem is not related to the ignition system or fuel system, a compression test can provide you with information about the likely cause of the problem
2. The engine must be warmed up to operating temperature, the battery must be fully charged, the spark plugs must be removed. The help of another person will also be required.
3. Disconnect the ignition system by disconnecting the low voltage lead ("+15") from the ignition coil. Install the compression tester into the spark plug hole of cylinder No.1.
4. Fix the throttle valve in the fully open position, turn the engine over with the starter. Record the highest reading on the compression gauge.
5. Repeat the test on the remaining cylinders, recording the compression values.
6. The pressure difference between any two cylinders should be no more than 1.0 bar. If the pressure in any cylinder is low, pour engine oil into the spark plug hole and repeat the test.
7. If after adding oil the compression temporarily improves (increases), this indicates wear of the cylinder wall or piston ring. If there is no improvement, then the leak is either through burnt valves or a burnt cylinder head gasket.
8. Low compression between two adjacent cylinders is almost certainly due to a blown head gasket between them.
[Information taken from the website opelbook.ru]
9. At the end of the test, install the spark plugs, connect the low voltage wire to the ignition coil.
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