8-cylinder engine (3.7 ltr., 4.2 ltr. 5-valve), mechanics — Checking compression — AUDI

🧭 Before you start

Fits: Audi A8 D2 (4D)

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• Using the compression tester operating instructions.

🔧 Engine codes this applies to

📋 Procedure

1. Detach engine cover panel (arrows).
2. Remove air intake pipe (arrows) between air cleaner and throttle valve unit.
3. Unplug connectors (1) on ignition coils.
4. Unscrew bracket (2).
5. Remove ignition coils (3).

6. Unscrew bracket (3).
7. Unplug connectors (4) on ignition coils.
8. Remove ignition coils (5).
9. Unplug electrical connectors from injectors (2).
10. Remove spark plugs with spark plug socket3122 B.
11. Open throttle valve fully.
12. Check compression pressure with compression testerV.A.G 1763. [Note: Using the compression tester operating instructions.]
13. Operate starter until pressure reading on tester no longer rises.

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