Golf III L4-2.0L (ABA) (1995)
Exhaust System Back Pressure Check (Using Oxygen Sensor Mounting Hole)
EXHAUST PRESSURE CHECK AT OXYGEN SENSOR OR CO TEST PIPE
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Install exhaust backpressure tester in place of Oxygen sensor (or CO test pipe).
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With engine idling at normal operating temperature;
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Gauge reading should not exceed 8.6 kPa (1.25 psi).
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Increase engine speed to 2000 rpm.
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Gauge reading should not exceed 20.7 kPa (3 psi).
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If backpressure at either speed exceeds specification, a restricted exhaust system is indicated.
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Inspect exhaust system for a collapsed pipe, heat distress or possible internal muffler failure.
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If no obvious reasons for excessive exhaust system backpressure are found, suspect a restricted catalytic converter.
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After completing test, coat threads of oxygen sensor (if removed) with anti-seize compound prior to reinstallation.
DROP TEST
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Remove converter from the car.
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Hold the converter vertically and drop it from about 20 cm (8 in) on to a block of wood.
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Turn the converter over and drop it on its other flange from the same distance.
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If a slight knocking sound is heard from inside the converter, or if the ceramic grid moves inside the housing, the converter is damaged and should
be replaced.