Electronic Vacuum Regulator Valve - Service

Number: 84-71

Section: 6E (VIy)

Date: Feb., 1984

Subject: ELECTRONIC VACUUM REGULATOR VALVE SERVICE ON 3.8L CALIFORNIA ENGINES ONLY (CODE A)

Model and Year: 1984 CAPRICE, MONTE CARLO
AND EL CAMINO

TO: ALL CHEVROLET DEALERS

FIGURE A - EGR Vacuum Diagnostic Control:

FIGURE B - EGR Vacuum Diagnostic Control - Second Type Valves:

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, P/N 25519370 should be ordered.

FIGURE B - EGR Vacuum Diagnostic Control - Second Type Valves:

The filter for second type valves (Figure B) will also be serviced by P/N 25520267 beginning approximately November, 1983.

FIGURE A - EGR Vacuum Diagnostic Control:

If service of the filter is required on type 1 EVRV's (Figure A), the complete valve assembly must be replaced.

FIGURE B - EGR Vacuum Diagnostic Control - Second Type Valves:

Second type EVRV's (Figure B) went into production beginning October, 1983. Recommended service interval on the EVRV filter assembly is 30,000 miles.