S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
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With outlet hose -1 - of VAG 1687 connected to air pressure adapter.
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Attach shop air supply line to previously installed male fitting.
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Open valve -3- between regulator valve and gauge.
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Adjust test pressure up to 0.5 bar (see CAUTION below) by turning the regulator valve -2-.
CAUTION!
DO NOT pressurize system above 0.5 bar! Doing so may force oil into the intake system which can damage the engine.
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Slowly open outlet valve -4- (after gauge) test hose connections.
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Observe pressure gauge for a drop in pressure.
Note:
Some pressure will be lost past the throttle plate.
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Readjust test pressure to 0.5 bar (see CAUTION above) by turning the regulator valve -2-.
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Listen for any very large intake leaks.
If smoke generator was used to fill the system with smoke:
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Inspect intake system connections for smoke at leaks.
Note:
An Ultrasonic detector may also be used to detect extremely small leaks where smoke may not be visible.
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Repair any leaks found.
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Remove tester.