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How to Clean a Catalytic Converter Efficiently

  • Auto Insurance
  • Vanessa Norris
  • 8 minutes

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Do you know that modern gas and diesel vehicles require a catalytic converter to keep them fuel-efficient and eco-friendly? It’s a crucial component that helps remove harmful exhaust fumes produced by the engine’s combustion process. However, over time, catalytic converters can get clogged due to exhaust buildup. But, did you know that cleaning a catalytic converter can save you tons of money instead of replacing it altogether? So, if you’re curious about how to clean your catalytic converter and keep your car running smoothly, you’ve come to the right place! This blog will guide you through all the steps you need to know to clean your catalytic converter like a pro.

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How to diagnose a clogged catalytic converter? 

Your car’s onboard diagnostic (OBD) system has a link to catalytic converters with sensors. An error code will be generated by the sensor if the catalytic converter is not performing to its maximum potential, and the driver will be informed via a notification or warning light. However, Catalyst System Efficiency Below Threshold is the most commonly encountered error code, P0420. There may be an issue upstream that is causing a converter to lose efficiency, even though the name suggests otherwise. Other signs are: 

  • The stench of a rotten egg 
  • Starts that are difficult to manage 
  • Sluggish acceleration 
  • Power loss and poor fuel efficiency

What causes a catalytic converter to get clogged? 

Nonetheless, the catalytic converter has a direct link to the combustion process, which can lead to a variety of problems. The following are some of the more typical examples: 

Improper fuel-to-air ratio 

In short, fuel-to-air mixtures that are not in proper tune can have a negative impact on a wide range of car components. Because the catalytic converter is located after the combustion chamber, it is susceptible to carbon or fuel buildup under lean or rich operating conditions. In the event that fuel enters the catalytic converter, its internal components could be destroyed. 

Bad oxygen/lambda detection 

In fact, an engine and its exhaust system consist of sensors. Oxygen levels are always under check by these sensors to ensure optimal performance of the vehicle. These sensors aren’t going to give you the data they need to keep things in check if they’re connected incorrectly, have faulty wiring, or are malfunctioning themselves! There is a risk of overheating that damages the converter without the watchdogs in place. 

Damaged body 

Things like speed bumps, off-roading, driving over branches, rogue highway tires, and other impediments can physically damage the converter. In the case of any damage to the external shell or internal components, the device could malfunction or even fall apart. 

catalytic converter

Source: Performancemuffler

Deep cleaning a catalytic converter 

This method necessitates more physical effort, and it makes use of products that you most likely already have in your home. Not recommended for those who have never dismantled and reassembled cars before. If this is your first time doing so, you should seek the advice of a professional. Follow these steps to thoroughly clean your catalytic converter: 

  • Remove the vehicle’s catalytic converter with the proper tools. 
  • Add the dish soap and water to a large bucket. 
  • Soak the catalytic converter, which is now dismantled, in the bucket overnight. 
  • Make sure that the converter’s honeycomb is free of debris.  
  • If so, replace the catalytic converter and reassemble the exhaust system. 

You can soak it for a few more hours if the soap and water don’t do the trick. But you may need to replace the it if your check engine light is still on and the code for a spent converter is still being generated.   

Cleaning using catalytic converter cleaner 

Alternatively, you can add a catalytic converter cleaner to your gas tank and use that to clean it. As soon as the fluid reaches the fuel tank, the gasoline inside is mixed with it. Using these chemicals in the fuel tank breaks down the buildup in the catalytic converter, resulting in a cleaner vehicle. Here’s how you clean using a catalytic converter cleaner:  

  • Your car’s fuel tank should be only 1/4 full. 
  • Clean the fuel tank by adding the cleaner. The amount required will vary according to the type of cleaner used. 
  • Drive for 10 to 15 miles at a reasonable speed. 
  • Continue driving as normal after you’ve refilled your gas tank. 

Keep in mind that these instructions are based on products available on the market.  If you’re unsure about anything, read the instructions on the packaging or call a trusted mechanic. 

What to avoid while cleaning a catalytic converter 

  • Assembling the component by immersing it in grout-eating gel, bleach, or other corrosive chemicals 
  • Making your gas tank full of paint thinner or lacquer 
  • Catalytic converters that don’t work with your vehicle 
  • The risk of damaging the vehicle or injuring oneself by attempting to saw off a welded catalytic converter. 

How to clean a catalytic converter without taking it off

The best way to clean a catalytic converter without removing it is by using a cleaner.

  • First, buy a good catalytic converter cleaner solution.
  • Pour the cleaner solution into your car’s fuel tank.
  • Then take your car for a long drive.

The best solution to clean a catalytic converter

  • Cataclean 120007 Fuel & Exhaust System Cleaner
  • MotorPower Care Catalytic converter cleaner
  • Liqui Moly 8931 Catalytic-System Cleaner
  • Dura Lube Severe Catalytic and Exhaust Treatment Cleaner Fuel Additive
  • Solder-It Catalytic Converter Cleaner and Deodorizer Fuel System Cleaner

Is cleaning the catalytic converter always effective? 

If cleaning the catalytic converter with either method does not yield results, it is time to invest in a new converter. The cost of a replacement is high, but it ensures that your vehicle is safe and functional. 

Also, if you have an internal oil or coolant leak, cleaning may not help. There will be thick smoke and soot clogging the system if these areas leak into the hot converter. Breaks in valve seals, damaged piston rings, and crankcase ventilation blockages are all indications of leakage. 

What is a catalytic converter cleaner?

Catalytic converter cleaner is a chemical solution that can be added to the fuel chamber of a vehicle to get rid of carbon buildup from the catalytic converter. This formula is also effective in cleaning other parts of the engine, such as fuel injectors, cylinder heads, and oxygen sensors.

Why DIY Catalytic Converter Cleaning Can Backfire

Your car sputters, throws engine codes, and hints at a clogged catalytic converter. While cleaning it seems tempting, consider the smoke screen of hidden risks:

1. Poisonous Playground: The converter houses precious metals and harsh chemicals. Improper handling exposes you to harmful fumes and skin irritants.

2. Demolition Derby: Aggressive cleaning methods can damage the delicate honeycomb structure, rendering the converter useless and costing you dearly.

3. Eco-Nightmare: Mishandled cleaning fluids can pollute the environment and land you in environmental hot water.

4. Wrenching Wrong Turn: Removing and reinstalling the converter requires finesse and specialized tools. One slip could spell disaster for your exhaust system.

5. Warranty Woes: DIY cleaning voids most converter warranties, leaving you holding the empty (and expensive) bag.

Before diving in, weigh the risks. While not cheap, professional cleaning could save you from a costly carmageddon.

Are catalytic converters covered under warranty?

Automakers are required by the Environmental Protection Agency to offer specific warranties for emissions components, like the catalytic converter. These warranties cover major emissions components for either eight years or 80,000 miles, whichever comes first.

How much does it cost to clean a catalytic converter?

Cleaning a catalytic converter will cost you around $8-$20. But, most car manufacturers don’t recommend it as catalytic converter cleaners could damage the internal parts. If your catalytic converter is faulty, cleaning it will have no effect, and any symptoms that existed before cleaning it will reappear anytime. Ideally, it will be best to replace it.

How often do you need to clean a catalytic converter?

We recommend you should clean it 4-5 times a year. You can do this by adding an additive to the gas tank that will cycle through the converter to clean it. The process is easy and will help clean the rest of the engine parts.

What is the life expectancy of a catalytic converter?

A new catalytic converter should last around ten years. But, the exact lifecycle can differ. Mileage and engine tune might impact the catalytic converter’s durability. So, you must inspect its condition after 30,000 miles.

How much lacquer thinner do you use to clean a catalytic converter?

A few mechanics recommend adding a quart of lacquer thinner to seven gallons of gas for cleaning a catalytic converter. Then they recommend driving your car for a long distance at high speeds for the thinner to pass through the exhaust system.

How long does it take Cataclean to clean a catalytic converter?

Cataclean is a cleaner you can use to clean your car’s catalytic converter. Add one 500ml Cataclean to around a quarter of a fuel tank, drive your car for 15-20 minutes, and refuel when needed.

How is a catalytic converter related to the Clean Air Act?

According to the Clean Air Act of 1970, every car manufactured after 1975 must have a catalytic converter. The act emphasized that cars should reduce emissions by around 90% within five years.

Can you clean a catalytic converter with a brake cleaner?

I would not recommend that. Brake cleaners are not safe for delicate sensors. They contain harsh chemicals that can cause damage. Additionally, brake cleaners are flammable and could ignite if exposed to hot engine exhaust.

 

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