This system delivers secondary air into the exhaust system to stabilize idle speed. The air regulator valve, air valve and bleed valve are connected to this system. The air regulator valve, mounted on the air cleaner, supplies air to the exhaust valve, which then directs it to the exhaust manifold. A vacuum pump is required to check both valves and this work should be taken to a workshop.
If the exhaust valve needs to be replaced, refer to Figure 142.
Figure 142. Removing and installing the exhaust valve 1. Body; 2. Reinforcement plate; 3. Exhaust valve; 4. Rubber seal
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