HARD/NO START WITH WARM ENGINE (NEW INJECTION NOZZLES). GMC Truck GMC G Van 1994

SUBJECT: HARD/NO START WITH WARM ENGINE (NEW INJECTION NOZZLES RELEASED)

MODELS: 1994 CHEVROLET AND GMC TRUCK G VAN AND P TRUCK WITH 6.5L DIESEL ENGINE (VIN Y - RPO L57)

CONDITION:

SOME CUSTOMERS MAY EXPERIENCE NO START OR EXTENDED CRANK TIME WITH A WARM ENGINE.

CAUSE:

SOME INJECTION PUMPS MAY NOT PRODUCE ENOUGH PRESSURE TO OPEN THE INJECTION NOZZLES, P/N 10233973, WHICH WILL CAUSE EXTENDED CRANKS AND HARD STARTS.

NOTE: THERE ARE OTHER CAUSES FOR NO START AND PROLONGED CRANK TIME AFTER HOT SOAK SUCH AS HIGH AMBIENT TEMPERATURES AND POOR GRADE FUEL, AND OTHER MECHANICAL CAUSES SUCH AS LOW COMPRESSION. THESE SHOULD NOT BE OVERLOOKED WHEN TROUBLESHOOTING FOR CAUSE OF HOT HARD/NO START.

CORRECTION:

VERIFY WHICH INJECTION NOZZLES ARE IN THE ENGINE BY EXAMINING THE INJECTION NOZZLE PART NUMBER AND BAND COLOR. IF THE ENGINE HAS ORANGE BAND INJECTION NOZZLES, INSTALL THE NEWLY RELEASED NOZZLES CURRENTLY USED ON 6.5L DIESEL ENGINES (VIN P - RPO L49) WHICH HAVE PURPLE BANDS.

PARTS INFORMATION:

DESCRIPTION PART NUMBER BAND COLOR ----------- ----------- ---------- INJECTION NOZZLE 10233973 ORANGE INJECTION NOZZLE 10233972 PURPLE

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

LABOR OPERATION NUMBER: J5947 - INJECTION NOZZLES, REMOVE AND REPLACE USE PUBLISHED LABOR TIMES.

FIGURES: 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.