A pre-formed Y-pipe with two catalytic converters is more common; though an expensive OE arrangement. In any case, if one catalytic converter has failed due to age or operating conditions, the other is likely in the same shape. This means that they accomplish three different specific operations on the exhaust stream.
The first is that they strip the oxygen molecule from nitrogen oxides. The byproducts of this are harmless nitrogen and a free oxygen molecule. The second operation is to add an oxygen molecule to carbon monoxide which is another very harmful product of burning hydrocarbons. Carbon monoxide is a particularly deadly gas, but adding a molecule of oxygen to it creates carbon dioxide.
This has problems in itself, of course being the infamous CO2 , but it is more inert and not immediately harmful in low concentrations. The third operation also consumes free oxygen to convert unburned hydrocarbons into CO2 and H2O. The main way that the PCM determines the efficiency of a catalytic converter is by looking at data from the O2 sensors before and after the catalytic converter and using that data to infer the oxygen capacity of the converter. This is more or less its capacity to perform the last two operations.
The conversion of unburned hydrocarbons in the exhaust stream is an essential role of the catalytic converter. However, it can also lead to problems if they are excessive as the process itself generates heat.
Hydrocarbons in the exhaust stream can come normally from hard acceleration or less than perfect combustion. They can also form from various engine problems both mechanical and sensor-related leading to a too rich fuel mixture or poor combustion, or engine misfires.
In small amounts or for brief periods, usually, no harm is done. In the worst cases, the core can melt down and obstruct the exhaust flow. Oil burning can also cause issues.
Every engine burns a little bit of oil by design as oil lubricates the cylinder walls as the rings move against them to prevent wear. As the rings age and especially if oil changes are neglected allowing thickened oil to gum up the free movement of the rings, however, more oil can be left on the cylinder walls than designed.
Older and neglected engines tend to burn more oil and that can cause problems with the catalytic converter. This typically leaves carbon deposits on the active matrix that interferes with the effective operation.
This is usually due to a buildup of contaminants that the converter was not able to burn up. Another sign that your catalytic converter could be faulty is that your fuel economy is poor. If you notice that your fuel is being used up faster, this may be your problem. Finally, watch for backfiring sounds or a rough driving experience.
It could very well be the catalytic converter. While you could save money on labor costs by doing the job yourself, it is not recommended for most people. Also, it may require welding to attach the catalytic converter.
Your savings for doing it yourself will be minimal, but if you are experienced in changing out catalytic converters, then you can save some money. In the worst-case scenario, a defective catalytic converter will limit the exhaust flow and will result in rough running and even total engine failure. There are varying types of diagnostic methods that mechanics use for different levels of converter failure. Should the check engine sign flash on to reveal catalytic converter failure, then you should follow the diagnostic procedures as set out by the manufacturer to determine the cause.
Replacing a catalytic converter is a rather complex task that requires the use of specialized tools; hence it should be left to the professionals. For example, the mechanic has to use a power saw just to cut the old catalytic converter out and remove it. This has to be done delicately and carefully because one wrong step and the procedure might cause damage to other parts surrounding the converter.
Once the old converter is out, the mechanic will weld the new converter in its place. Sometimes, an obstruction in the fuel like dirt and debris can compromise the efficiency of the catalytic converter considerably. Cleaning the fuel with an appropriate cleaner is one of the most efficient ways that you can use to save the catalytic converter from total damage.
That said, you should keep in mind that this is only a temporary solution. That said, if you have changed a catalytic converter before and you have solid experience working with cars and car parts, then doing it yourself could save you money because you already have most of the tools required. Another way to save money would be to get quotes from different mechanics in your area so that you can compare prices and service value until you find one that offers the best value for money.
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