What Are The Testing Methods For Exhaust Catalytic Converters?

Visual Inspection: Check the exhaust catalytic converter for damage and overheating during driving. After lifting the vehicle, inspect the catalytic converter surface for dents. Obvious dents and scratches indicate potential damage to the catalytic converter carrier. Observe the catalytic converter housing for severe discoloration spots or slight bluish-purple marks. Check for very noticeable dark gray spots in the center of the catalytic converter protective cover; these indicate the catalytic converter has been overheated and further inspection is required.

Back Pressure Test: Drill a hole at an appropriate location on the exhaust pipe at the front of the exhaust catalytic converter and connect a pressure gauge. Start the engine and measure the exhaust back pressure at idle and 2500 rpm. If the exhaust back pressure does not exceed the engine's specified limit, the catalytic converter carrier is not blocked.

Vacuum Test: Connect a vacuum gauge to the intake manifold, start the engine, and gradually increase its speed from idle to 2500 rpm. Observe the changes in the vacuum gauge. If the vacuum level drops at this point, keep the engine speed at 2500 rpm. If the vacuum level reading drops significantly thereafter, it indicates that the exhaust catalytic converter is blocked.