The exhaust gas recirculation system consists of an EGR valve, a modulator, a vacuum changeover valve (VSV) (it is located near the exhaust manifold) and vacuum hoses. The EGR valve is vacuum controlled based on signals from the engine control unit.
Replacing the EGR valve produce as follows:
- remove the throttle assembly;
- disconnect the vacuum hose from the EGR valve;
Figure 7.26. Location of the exhaust gas recirculation (EGR) valve
- disconnect the EGR hose, remove the bolts and the EGR valve from the intake manifold (figure 7.26). If the EGR valve is clogged, replace it, but do not clean it in solvent.
Installation is carried out in the reverse order of removal.
Replacement of the EGR vacuum modulator and filter produce as follows:
- label and disconnect the vacuum hoses from the EGR vacuum modulator. Remove the EGR vacuum modulator from the bracket;
Figure 7.27. Removing the filter from the EGR modulator
- if the modulator is to be reinstalled, remove the cover and check the condition of its filters (figure 7.27);
- clean the filters by blowing them out with compressed air. If the filters cannot be cleaned, replace them or the modulator.
Installation is carried out in the reverse order of removal.
Replacing the vacuum valve (VSV) produce as follows:
- disconnect the electrical connector from the VSV valve;
- mark and disconnect the vacuum hoses from the VSV valve;
- remove the valve from the bracket.
Installation is carried out in the reverse order of removal.