The system рециркуляции ОГ (system EGR) is intended for quantity reduction оксида nitrogen in ОГ. The part of a gaseous waste through system regulated by the valve comes back again in an inlet collector. As a gaseous waste contains less gases, capable to burn their return promotes temperature decrease in the chamber of combustion and at the same time to quantity reduction оксида nitrogen.

Fig. 163. System parts рециркуляции ОГ on engine VR6: 1 — connections; 2 — накидная a nut; 3 — the pipeline; 4 — the air filter; 5 — the valve of return ОГ; 6 — a bolt, 10 Н·м; 7 — a connecting hose; 8 — the vacuum pipeline; 9 — штекерная колодка; 10 — the temperature gauge of system рециркуляции ОГ; 11 — the pipeline; 12 — the valve рециркуляции ОГ; 13 — a lining; 14 — an arm; 15 — штекерная колодка

Adjustment of work of system рециркуляции ОГ occurs by means of self-diagnostics of the established control system. The system structure рециркуляции ОГ is distinguished for the 2,0-litre engine and engine VR6, and presented on fig. 163 and 164 accordingly.

At removal and installation of details of system рециркуляции ОГ for engine VR6 carry out following recommendations:

- Connecting element 1 (fig. 163 see) screw in the top part of an inlet collector the moment of an inhaling 35 Н·м;