Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Spark Plug Removal Tool (3122 B)

• Compression Tester (V.A.G 1763)

Procedure






• Engine oil temperature at least 30 °C (86 °F).

• Battery voltage at least 12.5 V.

- Remove all ignition coils.

- Disconnect the left and right connectors on the back of the cylinder head - 2 - for the fuel injectors.






• Ignore - 2 and 3 -.

- Remove the spark plugs with (3122 B).

- Check compression pressure using the (V.A.G 1763).

• Using tester see operating instructions.

- Have a second technician press the accelerator pedal down all the way while operating the starter until the pressure increase is no longer displayed on the tester.

- Repeat procedure on each cylinder.






Assemble in reverse order of disassembling. Note the following:

- Install spark plugs.

- Install ignition coils.

- If the connectors were disconnected and the engine was started, then malfunctions have been stored in the Engine Control Module (ECM) Diagnostic Trouble Code DTC) memory. Generate Readiness Code in Guided Functions using a vehicle diagnostic tester.