6 Symptoms of a Failing Catalytic Converter

If you suspect you have a failing catalytic converter it is advisable to take the car to your mechanic and have them diagnose the problem. A catalytic converter is a vital part of the vehicle exhaust system. It works to convert harm­ful gasses in exhaust systems and change them into safe compounds that can be emitted into the atmosphere and cause less damage to the environment. The catalytic converter is placed between the engine and the exhaust muffler on the underside of the car. It is not common for a catalytic converter to fail. They are usually more subject to external damage like impact from debris or internal engine damage cause by overheating.

Misfiring

Misfiring in the engine system can cause the catalyst to over heat. Alternatively, an exceptionally rich fuel mixture will exhibit similar symptoms. When there is a presence of an extra rich fuel mixture raw fuel enters the catalytic converter and is ignited. This can cause the catalyst components to melt under such conditions.

Check Performance

Exhaust becomes trapped in front of the catalyst and there is a latent reduction in performance. This is created by back pressure which affects the running of your engine and stops it breathing. The sudden increase in back pressure can cause your engine to stall during your drive. It will act as though there is an air lock in your system. It will cause the car jerk or feel like there is no fuel reaching the engine when you push the accelerator.

Check Fuel Economy

You will most certainly become aware of deterioration in the economy of your fuel. Your car will utilize a noticeable amount more gas than usual and this will cost you significantly if the only fault is caused by a failing converter.

Check the Exhaust System

Assessing the cause of a failing catalytic converter can sometimes be traced back to an error in the fuel system. A distinctive sign of this is a restriction in the performance of the exhaust system. It is indicative of the melting of catalyst materials inside. 

Test the Carburetor

If your vehicle is equipped with a carburetor and you know how to test the catalytic converter, then test it. Remove the air cleaner and enlist the help of a friend. The will need to hold a strong light near the carburetor intake. Glance over the top of the carburetor toward where the light is shining and rev the engine. If you notice signs of fuel vapor suspended over the carburetor, you will be able to safely deduce that there is a clog in the catalytic converter.

Oxygen

Another way to identify whether a catalytic converter is failing is to temporarily take out the oxygen sensors from the exhaust. If there is an obvious alteration in the performance of the vehicle then you can be sure the converter has clog and is failing.

Alien Chemicals in the Converter

Contamination of the chemical mechanisms inside the catalytic converter, caused by the addition of substances such as motor oil or antifreeze can prevent the converter from performing correctly. You will notice a raised level of carbon emissions from the converter if this happens and you will need to replace the converter before it does damage to your entire exhaust system or emits an illegal amount of emissions into the atmosphere.