Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Compression Check: Testing and Inspection

COMPRESSION CHECKING:

Special Tools, Testers And Auxiliary Items:
^ 3122B Spark plug key
^ VAG 1381/1763 Compression tester

Test Conditions:
^ Engine oil temperature min. 30 °C.

Test Sequence:
- Disconnect Camshaft Position sensor harness connector.
- Open throttle to Wide Open Throttle position.
- Check compression using VAG 1381/1763 compression tester.
^ Using compression tester (refer to Operating instructions).
- Operate starter until tester shows no further pressure increase.

Compression Pressure:

Compression Pressure:




- Permissible difference between all cylinders 3 bar.