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Home >> Audi >> 2012 >> A7 Quattro Sportback (4GA) V6-3.0L SC (CGXB) >> Repair and Diagnosis >> Powertrain Management >> Tune-up and Engine Performance Checks >> Compression Check >> Testing and Inspection
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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 electrical connector - 2 - to the fuel injectors on the rear of the left cylinder head.






• Ignore - 1 and 3 -.

- Disconnect the electrical connector - 2 - to the fuel injectors on the rear of the right cylinder head.






• Ignore - 1 and 3 -.

- Remove the spark plugs with the (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.






Assembling

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 DTC memory. Generate readiness code in Guided Functions Vehicle diagnostic tester.
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