Yes, a clogged catalytic converter can cause a misfire. During the combustion process within the engine, the cylinder absorbs the mixture of fuel and oxygen. When there is a blockade, exhaust fumes stay inside the system.
As a result, the amount of oxygen is scarce. The cylinder starts to absorb exhaust fumes. The combustion process requires oxygen, and the engine misfires when it does not get it.
The vehicle’s computer often discovers the problems within the engine system when a misfire happens and throws the diagnostic trouble code. That means it is time to check the part when you see the check engine light turned on.
Here are some reasons for a clog:
- Oil or antifreeze entering the exhaust system
- Unburned fuel entering the exhaust
- Short trips
- Improper additives and fuel
Unclogging
Unclogging a catalytic converter is certainly easier than the diagnostic part. Once you are sure it is clogged, you should find out how bad it is. If the damage is minor, you can try to repair it yourself.
Running your car too slowly is what sometimes causes minor cat clogging. Emission vehicle systems and an engine need a certain temperature for efficient functioning.
The best temperature for a catalytic converter is in the range of 800 °F to 1832 °F. You can try to drive your car faster than you usually do so that the heat will burn off all undesirable sediments in the system.
| Problem | Cost to Fix |
| Engine rebuild or replacement | $4,000 – $8,000 |
| Faulty catalytic converter | $1,000 – $2,500 |
| Fuel injection system repair | $800 – $1,500 |
| Hybrid battery replacement | $4,000 – $8,000 |
| Suspension failure (shock absorbers, etc.) | $1,500 – $3,000 |
| Timing belt replacement | $1,000 – $2,000 |
| Transmission failure | $3,000 – $4,000 |
| Turbo or supercharger failure | $2,000 – $5,000 |
The second method includes using a cleaner. Ensure your car has 15 liters of fuel before pouring the cleaner into the fuel tank. The next thing you should do is to drive a car for about 30 minutes at no less than 2500 rpm till the fuel runs out. Pay attention to the temperature of an engine so it won’t rise too high.
This method will be successful when you no longer have any problems with acceleration. Fewer fumes from an exhaust pipe are also a good sign. It is an efficient way to clean minor clogs.
Dura Lube Fuel Additive
Here’s the product we recommend for the purpose.
| Name | Severe Catalytic and Exhaust Treatment Cleaner Fuel Additive |
| Benefits | Increases fuel economy |
| Brand | Dura Lube |
| Country of Origin | USA |
| Item Form | Liquid |
| Product Dimensions | 2.62 x 2.62 x 9.12 inches |
| Weight | 16 fl oz |
Pros
- It’s a great option for minor clogs.
- It’s a very affordable treatment.
- It might save you from having to replace the device.
Cons
- It may not be able to fix major clogs.
For a more considerable blockade, try the following procedure.
The other method is the more complicated one, which involves removing the catalytic converter. To avoid injury, make sure the exhaust system is cool. Then put your car on jack stands and get rid of the oxygen sensors.
After removing the catalytic converter, check it for a rattling noise. If you hear any sounds inside, stop the unclogging procedure and replace it with a new one. The following steps are to wash it with a pressure washer and plunge it in hot water with a degreaser. Finally, let it dry and reinstall it afterward.
Those methods are useful when the damage is not significant. If yours has serious mechanical damage, manual cleaning won’t work. In that case, the only solution is to buy a new one. Considering that they are made of expensive metals, it would impoverish your purse for no less than $1000. Make sure to look out for clogs to and get the car’s best mileage.
Be sure to be on the lookout for a decrease in power, so replacement of these palladium-filled parts won’t be necessary. You’ll even be able to pass the emissions test without problems upon inspection.
