INFORMATION ON LINEAR EGR VALVE INSTALLATION. GMC Truck Sonoma Pickup

SUBJECT: INFORMATION ON LINEAR EGR VALVE INSTALLATION

MODELS: 1993-96 CHEVROLET AND GMC TRUCK S/T, M/L, C/K, P, G MODELS 1993-94 OLDSMOBILE BRAVADA 1996 OLDSMOBILE BRAVADA WITH 4.3L V6, 5.0L V8, 5.7L V8 ENGINE (VINS W, X, M, R - RPOS L35, LF6, L30, L31)

WHEN INSTALLING LINEAR EGR VALVES, TAKE CARE TO ORIENTATE THE VALVE PROPERLY BEFORE INSTALLATION. IT IS POSSIBLE TO ROTATE THE LINEAR EGR VALVE 180 DEGREES, AND THEN INSTALL IT ON THE INTAKE MANIFOLD.

NOTICE: LINEAR EGR VALVES IMPROPERLY INSTALLED DO NOT FUNCTION AS INTENDED. POSSIBLE DRIVEABILITY CONCERNS INCLUDE A ROUGH IDLE AND THE SETTING OF CODES DTC 32 (EGR ERROR) OR DTC 1406 (PINTLE POSITION ERROR).

LINEAR EGR VALVES IMPROPERLY INSTALLED MAY RESPOND TO HIGH VACUUM CONDITIONS (AT IDLE) BY PULLING THE VALVE OPEN, OR HIGH BACK PRESSURE CONDITIONS BY PUSHING THE VALVE OPEN.

WHEN REPLACING OR RE-INSTALLING A LEGR VALVE, INSTALL THE VALVE (WITH A NEW GASKET) IN THE CORRECT ORIENTATION.

A NEW INSULATED GASKET FOR USE WITH THIS VALVE HAS BEEN RELEASED FOR PRODUCTION AND SERVICE.

SEE FIGURES BELOW.

(INSERT TP0L3503 HERE) (INSERT TP0L3502 HERE) FIGURE 1 FIGURE 2

(INSERT TP0L3501 HERE) FIGURE 3

PARTS INFORMATION

APPLICATION DESCRIPTION SERVICE P/N

ALL LINEAR EGR GASKET ONLY 12555896 VALVES

IMPORTANT: THE NEW GASKET MUST BE USED WHENEVER A LEGR VALVE IS REMOVED AND REINSTALLED.

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

FIGURES: 3 ATTACHMENTS: 0

FIGURE 1. 1993-95 4.3L FIGURE 2. 1993 -95 4.3L LB4 TBI V6 ENGINE L35 CPI V6 ENGINE 1 - LINEAR EGR VALVE 1 - LINEAR EGR VALVE 2 - GASKET ENGINE 2 - GASKET 3 - INTAKE MANIFOLD 3 - INTAKE MANIFOLD

FIGURE 3. 1996 4.3L LF6 AND L35 V6, 5.0L L30 AND 5.7L L31 V8 CENTRAL SFI ENGINE 1 - LINEAR EGR VALVE 2 - GASKET 3 - INTAKE MANIFOLD

Object Number: 93067 Size: MF

Object Number: 92344 Size: MF

Object Number: 92343 Size: LF

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.