Q7 Quattro V6-3.6L (BHK) (2007)
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.
‹› Battery voltage at least 12.5 V.
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Switch off ignition.
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Disconnect electrical connector - arrow - for Engine Speed (RPM) sensor (G28).
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Remove ignition coils.
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Remove spark plugs with spark plug removal tool (3122 B).
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Check compression pressure with compression tester (V.A.G 1763); => Operating instructions.
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Have a second person completely depress gas pedal and operate starter long enough until tester no longer indicates increase in pressure.
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Repeat procedure on each cylinder.
Assembly is in reverse order of removal, note the following:
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Install spark plugs.
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Install ignition coils.
If connectors and fuse were removed, malfunctions are saved in Engine Control Module (ECM).
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Connect vehicle diagnosis, testing and information system (VAS 5051B).