Selecting the appropriate catalytic converter for your car is progressively recognised as one of one of the most essential choices you will make when maintaining your vehicle. Whether you are seeking to increase performance, reduce gas consumption or do your bit for the atmosphere obtaining the best catalytic converter for you will save time, cash as well as avoid the headaches of failing an MoT.

Below are some frequently asked questions regarding catalytic converters:

Why should I have a catalytic converter?

If your automobile was fitted after 1st August 1992 with a catalytic converter from brand-new, you require to have one for the MoT. It needs to be in good working order to comply with the Government’s emissions legislation. The engine has been developed to work with a Feline and besides giving out harmful discharges, the efficiency will certainly be lowered if your Cat is not functioning appropriately. You will certainly fall short the annual MoT if either it is not present or it is not in good working order.

Can I eliminate my Pet cat?

If your automobile was registered after 1st August 1992 you need to have the Cat existing and helping the MoT. Previously signed up automobiles can have the Feline completely eliminated.

Why do people wish to eliminate their Felines?

Without a Pet cat the engine gives even more power as well as decreased petroleum intake. You might eliminate the Feline for track/ competitors/ display screen use, for instance.

Why might my Pet cat fall short?

Roadway Damage

The outside of the cat can be harmed by hitting strong things in the road. ie, speed bumps, large rocks and so on

. Connected or infected

Plugged or contaminated catalytic converters are caused by the incorrect sort of gas in your car. Making use of leaded or lead substitute gas will plug up the monolith and trigger it to quit working. A comparable thing will certainly occur if gas ingredients are made use of that are not ideal for use with a catalytic converter.

Thawed/ Damaged substrate

A monolith is usually broken when it is influenced by an item or when it experiences a sudden change in temperature level. If the catalytic converter endures roadway damages (See area on roadway damage) the pillar inside can be split because of it being squashed by the motion on the steel can.

Using exhaust paste before the catalytic converter can create the pillar to damage. When the exhaust paste has set, tiny pellets may escape as well as shoot right into the catalytic converter. The monolith will progressively be destroyed by these pellets and also break down. The catalytic converter can additionally be damaged by extreme engine vibration. One more feasible reason for a broken monolith is a sudden temperature level modification. (See number 7 in “Caring for your Catalytic Converter”).

The monolith can be thawed when unburned gas is infused into the catalytic converter. This can be triggered by the vehicle being bump or tow began, or if the automobile’s engine needs a number of turns before firing. Even more information can be found on this is the area on ” Getting too hot”.


There are several troubles that can trigger a catalytic converter to overheat or stop working. One of the most typical reason is unburned gas entering the catalytic converter. Also damaged spark plugs and also leads will certainly trigger the engine to misfire and also spoil the catalytic converter. It will certainly additionally be harmed if the supplier timing is out.

Oxygen Sensing unit – An oxygen sensor gathers as well as sends info to the Electronic Control System. This is utilized to regulate the fuel/air mix. If the oxygen sensing unit is damaged, or it has actually been contaminated with silicone from anti-freeze or sealer, he fuel/air combination will certainly not be corrected and excess gas will get in the catalytic converter, creating it to overheat.
Fuel shot systems – If a fuel injector is dripping inside or oozing fuel right into the engine the catalytic converter might be damaged. The excess gas will enter the exhaust system and cause it to get too hot. Due to the differing fuel injector systems the appropriate manual need to constantly be spoken with when attempting to detect a issue.
Map Sensing units – Map sensing units tell the Electronic Control Unit the tons on the engine and also the quantity of air entering it. If this sensor fails it triggers a abundant condition in the engine, which can get too hot the catalytic converter causing it to fall short.
Carburettor systems – A used or faulty carburettor can create a catalytic converter to get too hot. Troubles such as improper float or air/fuel mix modifications and also worn metering poles can damage the catalytic converter. The choke system also requires to be running effectively so the best level of fuel enters the system. If way too much fuel gets in the system it will get too hot and also at some point fail.
Canister Cleanup Valve Control – This vacuum ran valve vents fuel vapour from the carburettor bowl to the charcoal container. If the vacuum cleaner is breached the charcoal canister will certainly flood, triggering the air/fuel combination to end up being really rich. This will certainly create the catalytic converter to get too hot and break down.
A catalytic converter should not be thought about to be a silencer although it does have some silencing qualities. Sound can be brought on by excessive fuel entering into the catalytic converter.

What occurs if my Feline falls short?

If a catalyst fails it can block and the automobile will certainly break down.

What does my Cat do?

Catalytic converters are specialist environmentally friendly devices suited the exhausts of cars which make sure that hydrocarbons are burnt off which reduce the emission of hazardous toxins. Automobiles fitted with converters can make use of just unleaded gasoline as the lead in leaded gas poisons the converter and irreparably harms it.

Car manufacturers have ruled out the retrofitting of catalytic converters on older automobiles, claiming that it can irreparably harm the converter, as automobiles which have been using leaded gas for years have actually lead deposits in their engines. On suitable with a catalytic converter, these down payments can toxin the Pet cat and damage it permanently.

Unleaded fuel, when burned, produces gases such as carbon dioxide, carbon monoxide, hydrocarbons, and oxides of nitrogen, the latter three can be dangerous or cancer causing. A Catalytic Converter, which is working appropriately, develops a chemical reaction between these gases, which converts them to reasonably safe gases. It is crucial for the environment that you have your Catalytic converter checked routinely to guarantee it is working effectively.

Catalytic converters fitted to lorries can lower poisonous exhausts (e.g. Carbon monoxide gas, NO2, HC) by up to 90%. Catalytic converters do not minimize CARBON DIOXIDE emissions.

Can I fit a Cat to a car which doesn’t have one?

If your engine worked on leaded petrol you can not. The old down payments will toxin the Cat.

How can I best take care of my Feline?

There are several things you can do to guarantee your ‘ feline’ has a lengthy and also healthy and balanced life.

When fitting the catalytic converter, do not use exhaust paste in front of the cat. When the exhaust paste hardens it can break short in pieces and damage the pillar. Paste can likewise obstruct the pillar.
Constantly make use of the right fuel for your automobile.
Never ever utilize a fuel additive without first checking out the instructions to find out if it appropriates for usage with a catalytic converter. If in doubt, contact the maker of the additive.
Never ever try to bump or tow start your cars and truck. This causes unburned gas to be injected into the catalytic converter, that makes the pillar overheat and thaw.
Never ever tow anything that is also heavy for your vehicle to deal with. For instance, an overloaded caravan will actually push a car along when it takes a trip downhill. This sends out unburned fuel right into the exhaust system and also can trigger the pillar to thaw down.
Have your auto frequently serviced to your car manufacturers specifications. In particular, see to it the engine is running properly. A inadequately tuned engine can trigger the monolith to break down or become covered in soot, which quits it working routinely.
Make sure when driving through deep pools, fords or vehicle parking when there has actually been hefty snowfall. The catalytic converter runs at an extremely heat, and also when it comes into straight contact with water or snow it cools down extra rapidly than the pillar, and also in severe conditions the pillar can be crushed as the steel shell agreements.
Don’t park your auto over long grass or anything similar. As the catalytic converter operates at such a heat it can in fact establish the yard ablaze!
Drive gradually over speed bumps or extremely bumpy roadways to lower the possibility of the exhaust system being based. This can create impact damages to the catalytic converters.

know more about catalytic converter recycling here.