| Models with the carburettor engine |
| 1. If you think that the system is faulty, disconnect hoses from the EGR valve, the valve back pressure valve and thermal vacuum and blow them. If the hoses are not blocked, plug them back. |
| 2. Operations thermal vacuum testing of the valve described in the 2 of subsection 6.4.2.3. |
| 3. To check the EGR valve, disconnect the vacuum hose from the top of the valve to the pipe and connect another hose valve. Pull an air hose; check that the valve diaphragm rose quickly and came back when you stop pulling the air. The work of the diaphragm can be checked by touching a finger bottom side of the valve where the movement of the diaphragm is felt. If the diaphragm goes hard or does not move, the EGR valve must be replaced. |
| 4. If you are sure that the valve is undamaged thermovacuum, backpressure valve can be checked as follows. Warm up the engine to normal operating temperature and disconnect the vacuum hose from EGR valve. Close the hole with your finger briefly disconnected the hose and increase the speed of the engine. When the engine speed (and exhaust pressure) rises, the tube must be present in a vacuum. When the engine speed drops, the vacuum intake hose should stop valve pressure. If not, the valve is defective and must be replaced. |
| All models with fuel injection |
| 5. The recirculation system can be verified as described in the missing information related thermovacuum valve. However, thermal vacuum valve installed in these models the control solenoid valve. This solenoid valve is the same valve as the one that controls the operation of the control system for the release of fuel vapor from the fuel system, and it can be checked as described in the 2-5 subsection 6.4.2.3. |
