1. To perform this test, the coolant temperature must be below 30°C. Disconnect the high voltage wire from the ignition distributor.
2. Disconnect the electrical plug from the auxiliary air valve and pay attention to the condition of the connections of the plug contacts.
3. Connect a voltage meter to the plug contacts, start the engine and leave it to idle. The supply voltage must be at least 11.6V. If there is no voltage meter, a test bulb is enough to check the presence of current.
4. Leave the engine to idle with the auxiliary air valve electrical plug disconnected and clamp the branch pipe connecting the air supply pipe to the auxiliary air valve. The engine speed should decrease.
5. When the engine is warmed up to normal operating temperature, reconnect the auxiliary air valve plug, and then clamp the flexible tube. This time, the engine speed should not change.
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