Catalytic Converter: Testing and Inspection

INSPECTION
1. Visually inspect exterior of converter. If severe damage is noted, such as dented, crushed or rusted out shell, replace converter.
2. Whenever converter is removed from vehicle, shine a light through the outlet, observe through the converter to determine if the converter is plugged by carbon buildup or lead contamination. If element is clogged, melted or otherwise damaged, replace converter.
3. Gently shake the catalytic converter and listen for signs of loose components. If element is clogged, melted or otherwise damaged, replace converter.

FUNCTIONAL TEST
1. Run the engine at 2,500 rpm for approximately 2 minutes to heat catalytic converter to operating temperature.
2. Connect a surface temperature probe on exhaust inlet of catalytic converter and measure temperature.
3. Connect surface temperature probe on exhaust outlet of catalytic converter and measure temperature.
4. There should be at least 38°C (100°F) increase in temperature from the inlet to the outlet.
5. If temperature differential is less than specified, catalytic converter should be replaced.