8.1. General information

To avoid pollution of the atmosphere gaseous products of combustion and evaporations of gas condensate, on cars install various systems of decrease in toxicity of the fulfilled gases.
The combination of these or those systems is defined by year of release of the car, the place of its initial delivery to the consumer and type of the transmission. In the present manual the following main systems installed on cars are considered:
– electronic system of ignition;
– system of injection of air;
– system of impoverishment of fuel-air mix at the movement of the car on neutral transfer;
– system of decrease in toxicity at sharp closing of a butterfly valve;
– system of automatic adjustment of air temperature on an entrance to the carburetor;
– compulsory system of ventilation of a case.
In this section the system of indication of economy mode of the movement which is a part of the control unit of system of impoverishment at the movement of the car on neutral transfer is also described though it also does not treat directly system of decrease in toxicity of the fulfilled gases. For each of the systems stated above the device, working capacity check (on condition of a possibility of its carrying out), replacement of knots and units are described (for systems in which it is admissible).
Before drawing a conclusion on violation of operability of system of decrease in toxicity of the fulfilled gases, carefully check systems of ignition and food. In certain cases precisely to find out the reasons of unsatisfactory work or the complicated launch of the engine only specially prepared personnel by means of special tools and the equipment can. If check and service become difficult or works cannot be performed within local auto repair shop, address for consultation your regional dealer. However it does not mean that it is very difficult to serve and repair systems of decrease in toxicity of the fulfilled gases. You can independently carry out a set of inspections without special difficulties and by means of ordinary tools and devices to perform the most part of works on routine maintenance (and it is possible, and to execute them completely).

PREVENTION
The most common cause of malfunctions of systems of decrease in toxicity of the fulfilled gases often consists only in weakening of consolidation of a vacuum hose or damage of a vacuum hose or electric connections. Therefore always at first check hoses and wires.


Fig. 8.1. Basic elements of system of decrease in toxicity of the fulfilled gases: 1 – to system of ignition; 2 – control unit; 3 – flame arrester; 4 – switch of the economizer of compulsory idling; 5 – pneumatic shock-absorber of closing of a butterfly valve; 6 – an obednitel of fuel-air mix at the movement on neutral transfer; 7 – spool-type device of compulsory system of ventilation of a case; 8 – reed valves; 9 – air jet


Very attentively study the preventions provided in this section. It should be noted that the scheme in fig. 8.1 can not correspond in everything to that system which is installed on your car, because of the changes which are annually brought by the manufacturer.