At malfunction of the sensor of absolute pressure the frequency of rotation of a bent shaft idling increases up to 1024 ^min.-1.

If the engine is started at a temperature of cooling liquid of 15-30 °C and then there is in the idling mode, perhaps gradual decrease in frequency of rotation of a bent shaft. It is explained by existence of function of decrease in toxicity of the fulfilled gases at start of the engine (inclusion of elements of heating of oxygen sensors).