Audi 100/A6

1990-1997 of release

Repair and car operation

Audi 100/A6
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
+ 3.2. Diesel engines
+ 3.3. Removal and partition of engines
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. Exhaust system
+ 8. Systems of start, ignition
+ 9. Transmission
+ 10. Brake system
+ 11. Suspension brackets, steering
+ 12. Body
+ 13. Electric equipment
- 14. Good advice
   14.1.1. Changed numbers
   14.1.2. Purchase of the old car or mysterious set of figures and letters
   14.2. Durability of the car
   14.3. About parallelism of bridges of the car and the trailer
   14.4. Preparation of the car for winter
   14.5. It is not got – good advice
   14.6. From change of places "composed" changes nothing?
   14.7. Visit to car-care center
   + 14.8. Engine
   + 14.9. Conditioner
   14.10. Turbokompressor
   - 14.11. Rub in one – or how to save the catalyst
      14.11.1. As the catalyst works
      14.11.2. That ruins the catalyst
      14.11.3. Enemies of the catalyst
   + 14.12. Accumulator
   14.13. Generator
   14.14. Probuksovochka
   14.15. "Machine gun"
   + 14.16. Brake system
   + 14.17. Wheels and tires


14.11.3. Enemies of the catalyst


Except physical destruction there is one more frequent reason of failure of the catalyst. Fuel. It is extremely sensitive to composition of fuel. If gasoline etilirovanny, тетраэтил the lead, containing in it, is postponed on an active surface of catalytic "brick" and quickly "salts" it from what any reactions stop., Apparently, on fillings and tips of hoses began to put the different size, and distributing columns paint in different colors, and write about it at every turn, and all the same consumers sometimes confuse and fill in not that gasoline. And after all it is enough to "burn" half-tank of such gasoline, and the catalyst will be lost irrevocably.

But not only etilirovanny gasoline – the enemy of the catalyst. The catalyst can be ruined and unleaded if the control system of the engine is faulty, short burns down a mix or the engine it is strongly worn-out.

Threefold catalytic converters ("threefold" because as the catalyst set of three precious metals serves) establish only on those cars which engines are equipped with the closed monitoring system of an exhaust. In front of the catalyst the oxygen sensor which traces structure of an exhaust is established and transfers these data in the central processor. Depending on the content of oxygen in an exhaust, BEU regulates composition of gas mixture and ignition so that their optimum values were supported. It serves as the main protection for the catalyst, and also provides economy of fuel and overall performance of the engine. The catalyst does not transfer big deviations as a part of a working mix. Badly adjusted engine with the raised content of hydrocarbons in an exhaust simply ruin the catalyst. If the mix too poor, it can cause a sharp overheat of the catalyst from what the monolith, only already "physically" again will suffer. Thus, "life" of the catalyst depends on serviceability of a control system of the engine.

A lot of things depends and on serviceability of the most oxygen sensor. With "age" it becomes "lazy" or absolutely fails that affects structure of a mix and, respectively, on serviceability of the catalyst.

Spoil the catalyst the exhaust of strongly worn-out engine burning oil can also. It, getting together with an exhaust to the catalyst, "is baked" on a monolith surface, like a varnish, and let's to the catalyst work.

There are also other harmful factors. For example – candles. Improper candles will not give complete combustion that can cause in the catalyst pernicious reaction of fusion".

Be very careful in application of additives to gasoline or oil. The majority does not reflect on it, and after all additives too can harmfully influence the catalyst. If on a product it is not written: "it is compatible to the catalyst", do not risk better.

One more dangerous case – engine start by towage. Thus there can be a hit in the catalyst of simply pure gasoline. It, first, poisons the catalyst, but also can cause instant reaction and even explosion. Look also where go – try not to get to deep pools. The working temperature of the catalyst makes about 900 ° Page. Its sudden hit in water can be fatal.

As a whole, it is noticed that service life of the catalyst is influenced by service conditions. Catalysts by the cars maintained in city conditions when the engine often get more suffer. On the other hand, at long high-speed driving on highways the catalyst also spoils from that overheats".

At last, you arrive reasonably if will begin to examine all system of an exhaust regularly. If arms are broken or rubber suspension brackets fell off, the exhaust pipe will vibrate, transferring to the catalyst unnecessary loadings.