PHANTOM STALLS AT CLOSED THROTTLE & HIGH ENGINE LOADS. Pontiac Grand Prix 1993

SUBJECT: PHANTOM STALLS AT CLOSED THROTTLE AND HIGH ENGINE LOADS (REPLACE FUEL INJECTORS)

MODELS: 1991-93 CHEVROLET LUMINA 1991-93 OLDSMOBILE CUTLASS SUPREME 1991-93 PONTIAC GRAND PRIX WITH 3.4L TWIN DOHC V6 ENGINE (VIN X - RPO LQ1)

CONDITION:

SOME OWNERS MAY EXPERIENCE A PHANTOM STALL WHEN THE ENGINE THROTTLE IS CLOSED AND HIGH LOAD DEMANDS ARE PLACED ON THE ENGINE. TYPICALLY THIS IS ENCOUNTERED WHEN THE OWNER IS MANEUVERING IN A PARKING LOT AT AN IDLE SPEED WITH A CLOSED THROTTLE AND PLACING A HIGH LOAD DEMAND ON THE ENGINE SUCH AS POWER STEERING. THE ENGINE COULD STALL BUT WOULD RESTART IMMEDIATELY. THIS TYPE OF STALL IS VERY DIFFICULT TO DUPLICATE.

CORRECTION:

A NEW FUEL INJECTOR, PART NUMBER 25170699, HAS BEEN RELEASED FOR SERVICE TO CORRECT THIS CONDITION. THE NEW FUEL INJECTOR IS DESIGNED TO FLOW RICHER AT A LOW PULSE WIDTH. BEFORE REPLACING THE INJECTORS, REMEMBER TO CHECK THE FOLLOWING:

1) MINIMUM AIR RATE SETTING.

2) VEHICLES EQUIPPED WITH MANUAL TRANSMISSIONS: CHECK CRANKSHAFT END PLAY, REFER TO BULLETIN 236007.

3) POWER STEERING PRESSURE SWITCH.

4) MAKE SURE THE LATEST CALIBRATION IS INSTALLED IN THE VEHICLE, REFER TO BULLETIN 336506.

PARTS INFORMATION

PARTS ARE EXPECTED TO BE AVAILABLE FROM GMSPO ON JUNE 10, 1996.

QTY PART NUMBER NAME

6 25170699 INJECTOR ASM - M/PORT FUEL

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR CODE: J5650 INJECTOR, FUEL - REPLACE LABOR TIME: USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 0 ATTACHMENTS: 0

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.