Compression Check: Testing and Inspection

Compression pressure, checking





Special tools and equipment
^ 3122 B Spark plug wrench
^ T10095 Puller
^ VAG 1331 Torque wrench (5 50 Nm)
^ VAG 1763 Compression tester

Test conditions
^ Engine oil temperature at least 30°C
^ The battery voltage must be at least 11.5 V.
^ All electrical consumers, e.g. lights and rear window defroster must be switched off.
^ If the vehicle is equipped with air conditioning, this must be switched off.
^ On models with an automatic transmission selector lever in "P" or"N" position





Test sequence

- Remove fuse 29 from fuse holder.

Note: Removing fuse 29 interrupts the voltage supply to the injectors.

- Remove engine cover.





- Disconnect connectors from ignition coils 1. 6.

Note: Mark connector and component before disconnecting.

- Remove ignition coils with final output stage for cylinders 1. 6 using puller T10095.
- Remove spark plugs with spark plug wrench 3122 B
- Have a second technician fully depress accelerator pedal.
- Check compression pressure with compression tester V A.G 1763.

Note: Using compression tester, Refer to Operating instructions

- Operate starter until tester shows no further pressure increase.

Compression pressure values:
New: 10. . . 13 bar
Wear limit: 7.5 bar
Permissible difference between all cylinders: 3 bar

- Check DTC memory:
Refer to Powertrain Management
- Read readiness code:
- Generate readiness code again if DTC memory has been erased or engine control module separated from permanent positive supply:
Refer to Powertrain Management