Astra L4-1.8L (2009)
![background image](/saturn/astra/l4-1.8l/Page-249001.png)
Compression Check: Testing and Inspection
Engine Compression Test
Removal Procedure
1. Remove the throttle valve module. Refer to 1401335 - Replace Throttle Valve Module.
2. Remove the spark plugs. Refer to 1401340 - Spark Plugs, Remove and Install.
3. Remove the relay holder cover.
4. Remove the fuel pump relay.
Draw relay K3 out of mounting plug.
Measurement Procedure
Compression, Check
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4 cylinder
Important: Engine revs at least 300/min.
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Start the engine (approx. 4 seconds).
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Compare the compression values.
Maximum pressure differential 100 kPa (1 bar)
Installation Procedure
1. Install the fuel pump relay.
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Place into the socket.
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Ensure the plug contacts are sound.
2. Install the relay carrier cover.
3. Install the spark plugs. Refer to 1401340 - Spark Plugs, Remove and Install.
4. Install the throttle valve module. Refer to 1401335 - Replace Throttle Valve Module.