If the intake filter on an air pump is plugged, the test would show which outcome?

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Multiple Choice

If the intake filter on an air pump is plugged, the test would show which outcome?

Explanation:
When the air pump is functioning, it sends fresh air into the exhaust manifold to help oxidize carbon monoxide and hydrocarbons into carbon dioxide and water. If the intake filter is plugged, the pump can’t draw air, so no air is injected into the exhaust. That means the oxidation of CO and HC is limited, and their emissions stay higher on the test. The NOx level isn’t directly affected by this air-oxidation step, so it remains about the same. So the test would show higher CO and HC with little to no change in NOx.

When the air pump is functioning, it sends fresh air into the exhaust manifold to help oxidize carbon monoxide and hydrocarbons into carbon dioxide and water. If the intake filter is plugged, the pump can’t draw air, so no air is injected into the exhaust. That means the oxidation of CO and HC is limited, and their emissions stay higher on the test. The NOx level isn’t directly affected by this air-oxidation step, so it remains about the same. So the test would show higher CO and HC with little to no change in NOx.

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