For 1990-2009 cars

# SMU - SECTION C2 & 4C - FUEL METERING SYSTEM

#### SUBJECT: SERVICE MANUAL UPDATE-SECTION C2 AND 4C-FUEL METERING SYSTEM AND FUEL SYSTEM (SFI)-REVISED TO EMPHASIZE BOTTOM FEED FUEL INJECTOR REMOVAL AND INSTALLATION PROCEDURES

#### MODELS: 1992-96 BUICK CENTURY 1992-96 CHEVROLET BERETTA 1992-97 CHEVROLET CAVALIER 1993-96 OLDSMOBILE CUTLASS CIERA 1995-97 PONTIAC SUNFIRE

1994-97 CHEVROLET AND GMC S/T TRUCK WITH 2.2L ENGINE (VIN 4 - RPO LN2)

THIS BULLETIN IS BEING ISSUED TO EMPHASIZE THE IMPORTANCE OF FOLLOWING ALL OF THE PROCEDURES IN THE SERVICE MANUAL WHEN REPLACING BOTTOM FEED FUEL INJECTORS ON LN2 ENGINES TO PREVENT POSSIBLE ENGINE DAMAGE FROM HYDROSTATIC LOCK-UP.

* EXTRA ATTENTION MUST BE TAKEN TO ENSURE THAT ALL O-RINGS ARE INSTALLED PROPERLY ON BOTTOM FEED FUEL INJECTORS PRIOR TO INSTALLATION. * BOTTOM FEED FUEL INJECTORS MUST BE INSTALLED CAREFULLY TO PREVENT THE O-RINGS FROM DAMAGE WHICH CAN CAUSE FUEL TO ENTER THE ENGINE CYLINDERS. * FOLLOWING THE REPLACEMENT OF BOTTOM FEED FUEL INJECTORS, THE FUEL SYSTEM DIAGNOSIS TEST SHOULD BE PERFORMED TO VERIFY THAT THE BOTTOM FEED FUEL INJECTORS ARE NOT LEAKING. * IF THE FUEL SYSTEM DOES NOT HOLD PRESSURE, THE ENGINE MUST NOT BE CRANKED OVER. DIAGNOSE THE LOSS OF FUEL PRESSURE BEFORE CRANKING THE ENGINE.

#### NOTICE: IN ORDER TO PREVENT POSSIBLE ENGINE DAMAGE, THESE PROCEDURES MUST BE FOLLOWED.

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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.

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