Touareg V8-4.2L (AXQ) (2006)
Compression Check: Testing and Inspection
Compression, Checking
Special tools, testers and auxiliary items required
‹› Spark plug removal tool (3122 B)
‹› Torque wrench (5 to 50 Nm) (V.A.G 1331)
‹› Compression tester (V.A.G 1763)
Test conditions
‹› Engine oil temperature must be at least 30 °C.
‹› Battery voltage must be at least 11.5 V.
‹› All electrical consumers such as, for example, lights and rear window defroster must be switched off.
‹› If vehicle is equipped with an air conditioning system, this must be switched off.
‹› Selector lever must be in "P" or "N" position.
Test sequence
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Remove ignition coils with power output stage --> [ Ignition Coils with Power Output Stage ] See: Powertrain Management/Ignition
System/Ignition Coil/Service and Repair.
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Pull all connectors off from fuel injectors.
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Remove spark plugs using spark plug removal tool (3122B).
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Check compression pressure using compression tester (V.A.G 1763).
‹› Using compression tester --> Operating instructions.
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Have a second technician fully depress accelerator pedal and crank engine.
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Operate starter until tester shows no further pressure increase.
Compression pressure:
New: 10 to 13 bar pressure
Wear limit: 7.0 bar pressure
Permissible difference between all cylinders: 3 bar
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Install spark plugs using spark plug removal tool (3122B) and tighten to 30 Nm.
After test has ended:
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Connect Vehicle Diagnosis & Serv. System (VAS 5052).
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Perform vehicle system test "Guided Fault Finding".
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End vehicle system test in such a way that possibly existing DTC entries are automatically erased.
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Generate readiness code in conjunction with a road test.
Observe safety precautions that apply to road tests.
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Perform road test.