Cutlass Ciera FWD V6-181 3.0L (1984)
Figures A and B show both first and second type EVRV's.. The EGR vacuum diagnostic control switch shown in Figures A and B is serviced separately.
Should the diagnostics procedure lead to the replacement of this switch, part no. 25519370 listed in Group 3.670 should be ordered.
The filter for second type valves (Figure B) is now serviced by part no. 25520267 listed in Group 3.670 through WDDGM.
If service of the filter is required on a first type EVRV (Figure A) the complete valve assembly must be replaced.
Second type EVRV's (Figure B) went into production beginning October, 1983. Recommended service interval on the EVRV filter assembly is 30,000
miles.