A8 Quattro Sedan V8-4.2L (BVJ) (2008)
Compression Check: Testing and Inspection
Compression Pressure, Measuring
Special tools, testers and auxiliary items required
‹› Spark Plug Removal Tool (3122 B)
‹› Compression Tester (V.A.G 1763)
‹› Ignition Coil Puller (T40039)
Procedure
‹› Engine oil temperature at least 30° C.
‹› Battery voltage at least 12.5 V.
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Switch off ignition.
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Remove Engine Control Module (ECM) (J623).
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Only remove smaller connector - 1 - from engine control module (ECM) by removing connector lock - arrow -.
‹› The larger connector - 2 - remains connected.
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Free up fuel line and line to EVAP canister on air guide pipe.
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Disconnect electrical harness connector - 1 - at Mass Air Flow (MAF) Sensor (G70).