Additional air valve (VW Golf 2)

1. To perform this test, the coolant temperature must be below 30°C. Disconnect the high tension wire from the ignition distributor.

2. Disconnect the electrical wire plug from the additional air valve and pay attention to the condition of the plug contact connections.

3. Connect a voltmeter to the plug contacts, start the engine and let it idle. The supply voltage should be at least 11.6 V. If you don't have a voltmeter, a test light bulb is enough to check for current.

4. Leave the engine idling with the auxiliary air valve electrical wire plug disconnected and clamp the pipe connecting the air supply pipe to the auxiliary air valve. The engine speed should decrease.

5. When the engine has warmed up to normal operating temperature, reconnect the auxiliary air valve plug, and then tighten the elastic hose. This time, the engine speed should not change.

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