Catalyst fault symptoms

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We effect catalysts removal with lambda probes adaptation for any model. After this procedure the vehicle is operation correctly without errors. If you have already removed the catalyst without adapting to the rear lambda probes, and the car began to spend more fuel and show annoying error Check Engine, contact us and forget the problem.

We effect catalysts removal with lambda probes adaptation for any model. After this procedure the vehicle is operation correctly without errors. If you have already removed the catalyst without adapting to the rear lambda probes, and the car began to spend more fuel and show annoying error Check Engine, contact us and forget the problem. In general case, there remains a need to save all oxygen sensors operating correctly.

You may call us to get more information +375 (29) 103-19-19 (mobile)

Catalyst fault symptoms

The first sign that the catalyst will soon fail is the reduction of engine power: acceleration dynamics is worsen, maximum speed down, over time is difficult to start engine. Catalyst coking at an early stage may not be noticed. Just the driver has to press harder on the gas pedal in order to compensate loss of power. At this stage the exhaust gas sometimes has a sharp smell of toxic hydrogen sulfide that just indicates a problem with the catalyst, which violated the chemical processes of decomposition of the exhaust gases.

There are two reasons why catalysts are out of service:

1. Due to incorrect use, ceramic core is reflowed and cells are clogged with soot;
2. As a result of continuous operation, the catalytic layer or ceramic is destroyed.

Myths about catalysts

«The catalyst gets out of service very quickly».

This is not entirely true. The catalyst life under normal use (using high-quality oil products) is 60 000-150 000 km of run, then it is recommended to be replaced, that is quite natural. Catalytic filters exhaust gas, and filters, as known, must be changed.
However, its performance depends on the ignition system correct operation and power supply, as well as on the petrol quality.

Internal parts of the catalyst can be made of ceramic or metal. Ceramic catalysts are cheaper and therefore more common. However, the ceramic catalyst is rather fragile and afraid of mechanical influences.

For example, on impact with the stone lying on the road, internal ceramic honeycomb can shatter into small pieces. The same thing can happen if water reaches hot catalyst. Also ceramic catalyst may be destroyed by engine ignition system problems. This happens because during the abortive motor start, unburned fuel is accumulating in the exhaust tract. When the car is finally started, there is an explosion in the catalyst and ceramic honeycomb are destroyed.
The metal catalyst is more reliable. Still, whatever the internal structure of the catalysts, they all fail due to the following reasons:

-leaded or simply poor-quality petrol;
-oil or coolant flowing into the combustion chamber and thereafter into the catalyst;
-long engine operation at idle;
-too enriched fuel mixture caused by a malfunction in engine power supply system.

The catalyst is able to work properly only with an engine equipped with electronic ignition and injection system with microprocessor control.

“The catalyst reduces engine power"

This is not entirely true. Although catalyst has a total surface area about 20 hundred thousand square meters, it doesn’t prevent the passage of exhaust gases and doesn’t reduce the engine power. But faulty (melted, destroyed) catalyst or clogged with soot catalyst does reduce the permeability of the exhaust gases, causing the car to lose power. Inside defective catalyst the temperature may be increased so that the ceramic melts and completely covers the exhaust gas path. Of course, this is not good for engine. Therefore, the catalyst replacement is recommended at each 100 000 km, not depending on its performance.

Why catalyst is expensive?

Catalyst production is quite an expensive and complicated process. Also expensive platinum is used as chemical catalyst, which is able to withstand sulfur compounds. For greater efficiency, palladium and rhodium (a rare earth element) are added to platinum in catalytic layer.

To avoid problems with the catalyst, the following rules of operation should be observed:
заправлять автомобиль только качественным бензином;

не запускать двигатель с "толкача", так как попадающее в катализатор несгоревшее топливо может привести к его перегреву и соответственно выходу из строя (дешевле купить новый аккумулятор);

-fill the car with only high-quality petrol;
-do not start the engine with the "pusher", as unburned fuel, falling within the catalyst, can cause overheat and thus failure (cheaper to buy a new battery);
-if the engine does not start after two or three attempts, you must pause that the fuel, accumulated on the surface, needs time to evaporate;
-if there is need to turn the ignition on while troubleshooting electrical equipment, avoid contact with fuel in the exhaust system and catalytic, disconnect the fuel pump relay power.
- while the engine is running, it is not allowed to check the availability of current supply of high voltage spark plug, removing the tips of high-wire from them.

The probability of failure of the catalyst is increased by the release of a portion of the exhaust system unburned fuel at faults in the engine due to the failure of one of the spark plugs or the breakdown of high voltage cables.

How are the catalyst and lambda sensor connected?

For normal catalyst operation it is to be provided with constant optimal air-fuel ratio in the working mixture flowing into the combustion chamber.
14.7 parts of air to 1 part of fuel - such formulation provides maximum combustion of the fuel-air mixture, and the lambda sensor is just to maintain this proportion. Depending on the oxygen content in the exhaust, sensor provides the correct voltage and the control unit adjusts the mixture by changing the fuel quantity supplied to the cylinders.

Typically the sensor is located before the catalyst and measures the oxygen content in gases just before the catalyst. That is, the presence or absence of a catalyst does not affect the signals, which gives lambda sensor, they only affect the amount of oxygen. Another thing, when there are two oxygen sensors, one - before, and the other - after the catalyst. Based on the signal from the second sensor, occurs additional adjustment of the mixture composition.

Is it possible to disable the oxygen sensor?

There is no one solution for each matter. The most easy and correct this problem is solved in the case if the vehicle is provided with reprogrammable control unit for operation without a catalyst, such as, most BMW. In this case, after removal of the catalyst, management program is changed and lambda probe is simply removed. For some car brands reprogramming is not possible, and if a sensor failure greatly affects the operation of the engine, then there is no other way out – you need to install new sensor.

 

Also in many cars fault or lack of oxygen sensor has virtually no effect either the dynamic or the fuel consumption.