SMU - SECTION 9, 9A - 9B - DRIVEABILITY & EMISSIONS. GMC Truck GMC Suburban

SUBJECT: SERVICE MANUAL UPDATE-SECTIONS 9, 9A, 9B-DRIVEABILITY EMISSIONS AND ELECTRICAL DIAGNOSIS-REVISED "EGR SYSTEM CHECK WITH NEGATIVE BACK PRESSURE EGR VALVE" CHART

MODELS: 1991-95 CHEVROLET AND GMC TRUCK M/L, C/K, G, R/V, S, P3 AND P/G TRUCKS WITH 2.2L, 2.5L, 4.3L, 5.0L ENGINES (VINS 4, A, Z, E, H - RPOS LN2, L38, LB4, L03) WITHOUT 4L80E TRANSMISSION

THIS BULLETIN ADVISES OF A CHART REVISION IN THE FOLLOWING SERVICE MANUALS:

1991 LIGHT DUTY TRUCK FUEL AND EMISSIONS, PAGE 9-5 1992 LIGHT DUTY TRUCK FUEL AND EMISSIONS, PAGE 9-7 1993 LIGHT DUTY TRUCK FUEL AND EMISSIONS, PAGE 9A-5 1994 S/T, G, C/K, P3 AND P/G DRIVEABILITY EMISSIONS AND ELECTRICAL DIAGNOSIS, PAGE 9B-5 1995 S/T DRIVEABILITY EMISSIONS AND ELECTRICAL DIAGNOSIS, PAGE 9B-5

FIGURES: 00 ATTACHMENTS: 01

Object Number: 79850 Size: FS

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.