Would a catalytic converter efficiency at limit pass monitoring

. Almost every part on the engine determines how long a catalytic converter will last. It could be a faulty line of computer code that pulses an injector too long, or a stuck piston ring that allows oil to be sucked into the combustion chamber. Little details such as these can limit the life of a catalytic converter.

Switch-Ratio Scan Tool Test. Test Procedure – Run the engine rpm for 2 minutes and then monitor the upstream and downstream HO²S signals. You can do this with a Scan Tool or a Lab Scope. For each 10 upstream sensor signal switches the downstream sensor signal should switch less than 7 times. Test Example – In the example the …

Checking Catalytic Converter Efficiency – Tomorrows Technician

Checking Catalytic Converter Efficiency. The converter has an efficiency rating that is computed by the vehicle. This number rates the amount of reduction that is occurring in the converter and its ability to store oxygen. Almost every part on the engine determines how long a catalytic converter will last.

The Code. For a catalyst efficiency code to be set, a number of criteria must be met. The specific enabling criteria is different for almost every vehicle. For a code to be set, the oxygen or air/fuel sensor and the rear oxygen sensor must see a reduction in the efficiency of the converter. In other words, if the oxygen levels before and after …

People Also Ask would a catalytic converter efficiency at limit pass monitoring

How is the efficiency of a catalytic converter rated?

The converter has an efficiency rating that is computed by the vehicle. This number rates the amount of reduction that is occurring in the converter and its ability to store oxygen. But, the efficiency of the converter is tied to the fuel trim of the engine.

What limits the life of a catalytic converter?

Little details such as these can limit the life of a catalytic converter. Platinum, palladium, rhodium and cerium store oxygen in the converter during periods of lean operation or by an external air source. The oxygen is used to oxidize hydrocarbons and toxic gases during periods of “rich” operation.

What happens when a catalytic converter is blocked with precious metals?

The precious metals act as catalysts in the process and are not changed; they just store and use oxygen to break down combustion products. However, they can’t break down or oxidize some chemicals in the exhaust stream. If the catalyst is blocked by carbon, silica or phosphorus, the converter will fail to work.

What are the criteria for a catalyst efficiency code?

For a catalyst efficiency code to be set, a number of criteria must be met. For example, the oxygen or air/fuel sensor and the rear oxygen sensor must see a reduction in the efficiency of the converter. In other words, if the oxygen levels before and after the converter do not change, the converter is not working.

People Also Searches would a catalytic converter efficiency at limit pass monitoring

Diagnosing a catalyst efficiency code (P0420 or P0430) Video Answer

Leave a Comment