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What Causes the Loud Noise in Volkswagen's Secondary Air Pump?

1 Answers

McHenry

07/29/25 3:18pm

Volkswagen's secondary air pump may produce loud noise due to a dirty air valve. Working principle of the secondary air pump: When the engine is running, the crankshaft drive belt drives the air pump to operate, pumping a large volume of low-pressure air flow through a hose into the diverter valve. Under normal conditions, the valve on the diverter valve opens, allowing the air flow to pass through the diverter valve and the one-way valve into the air injection manifold. Function of the secondary air pump: The secondary air pump supplies air to the catalytic converter when the engine is cold. This allows the exhaust gases to react with the oxygen in the air for secondary combustion, increasing the temperature of the catalytic converter. This helps the catalytic converter reach its optimal operating temperature quickly, reducing the emission of harmful substances and serving an environmental protection purpose.

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