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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Audi A6 (1997 release)

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Audi A6
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A6
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Ignition, fuel injection and exhaust of gasoline engines
Fuel Injection System
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Overview
Separating center and rear silencers
The correct position of the elements of the exhaust system
Catalytic converter
The power supply system, and preheating the exhaust gases of diesel engines
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Catalytic converter



All vehicles are equipped with catalytic converters to reduce the amount of harmful substances emitted into the atmosphere with the exhaust gases.
By the converter housing is made of stainless steel, welded to the inlet and outlet cones to the nozzles and mounting flanges and also Heat Reflector holding the ceramic liner. The entire internal volume of the housing occupied by the porous ceramic monolith, catalyst fixed rings or stainless steel mesh. The catalyst has a honeycomb structure, the entire inner and outer surface of the cells, contacting the gases with a thin layer of an alloy of platinum, rhodium and palladium. The catalyst has a greater surface area covered with this alloy that mainly determines the high rates of catalytic converters.
In the catalyst reaction occurs, resulting in the hydrocarbons and carbon monoxide (carbon dioxide) are converted to carbon dioxide and water vapor.
In all models converter power system of the engine - the feedback, that is based on the signal from a lambda probe mounted in the exhaust system, the control unit continuously adjusts the air-fuel mixture. Depending on the content of oxygen in the exhaust gas oxygen sensor generates a voltage of 0.1 V (high content of oxygen, a poor mix) to 0.9 V (low oxygen content, rich mixture). Based on these data, the engine control unit changes the opening of the injectors and the fuel flow.
For complete combustion of the combustible mixture and the minimum content of harmful substances in the exhaust gas in the mixture for 1 hour fuel should account 14.7 h of air (by weight).
The catalytic converter works effectively at a temperature of 300 + ... + 800 ? C.

Operation of cars with catalytic converter
Neutralizer - is a reliable and simple device that does not require maintenance. To its life was the maximum, you must comply with the following requirements.
Do not use unleaded gasoline in a car equipped with a catalytic converter, because lead contained therein closes the precious metals in the lattice of the catalyst, reducing its efficiency, and as a result will damage the catalyst.
Always keep the power supply and the ignition system in good condition. Do not operate the vehicle with a faulty ignition system until repaired.
If the engine warning lamp will illuminate the engine management system, it is necessary as soon as possible to address on servicing deport. If damaged engine management system, besides the increase in fuel consumption and deterioration of the dynamic characteristics of the engine can be damaged the catalytic converter.
Do not start the engine with the help of towing.
Do not turn off the ignition at high engine speeds.
Do not use additives in fuel and engine oil, as they may contain substances that could damage the catalytic converter.
Do not use the vehicle if released from the exhaust pipe smoke blue.
After stopping the engine exhaust system long time continues to radiate heat, so you should avoid parking on the grass and dry leaves.
Remember that the converter is fragile, so avoid shock when removing it or other parts of the exhaust system.
The service life of the catalytic converter to correctly adjusted the engine is 100-160 thousand. Km of run of the car.




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The correct position of the elements of the exhaust system
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The power supply system, and preheating the exhaust gases of diesel engines

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