STALL ON LAUNCH/POOR THROTTLE RESPONSE (REVISED PROM). GMC Truck GMC C Pickup

********************************************************************* REVISION 01/10/94

THIS BULLETIN IS REVISED TO CORRECT LABOR OPERATION AND TIME INFORMATION. *********************************************************************

SUBJECT: INCREASED IDLE SPEED AND THROTTLE CALIBRATION OF 6.5L (L65) TURBOCHARGED DIESEL ENGINE TO IMPROVE MANUAL TRANSMISSION LAUNCH AND ADDRESS LOW POWER CONCERNS (INSTALL REVISED PROM)

MODELS: 1994 CHEVROLET AND GMC C/K TRUCKS WITH 6.5L (L65) DIESEL ENGINE (INJECTION PUMP PART NUMBER 10225929 ONLY) AND MANUAL TRANSMISSION (MT8)

CONDITION: SOME OWNERS MAY COMMENT ON ONE OR BOTH OF THE FOLLOWING CONDITIONS: - STALL ON LAUNCH AS CLUTCH PEDAL IS RELEASED - POOR THROTTLE RESPONSE (LOW POWER)

CORRECTION:

SCAN PROM ID AND UPDATE PROM AS DESCRIBED BELOW, IF REQUIRED. THE REVISED PROM WILL INCREASE THE BASE IDLE SPEED TO 700 RPM, AND PROVIDE AN IMPROVED THROTTLE CALIBRATION. IF THE UPDATED PROM DOES NOT CORRECT THE CUSTOMER CONCERN, REFER TO THE DIAGNOSTIC AND SERVICE PROCEDURES PROVIDED IN THE SERVICE MANUAL OR DRIVEABILITY, EMISSIONS, AND ELECTRICAL DIAGNOSIS MANUAL.

PART INFORMATION:

NOTE: THIS PROM REVISION IS FOR VEHICLES EQUIPPED WITH INJECTION PUMP PART NUMBER 10225929 ONLY.

1994 6.5L (L65) WITH MANUAL TRANSMISSION (MT8) ---------------------------------------------- NEW PROM NEW PROM NEW PROM TRUCK SERIES AXLE PART NUMBER B/C CODE SCAN ID ------------ ---- ----------- -------- -------- C/K 2500, 3500 ALL 16203352 BKWH 3335 C/K 3500HD (C5B) ALL 16203348 BKWD 3315

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION: T0500 PROM, REPLACE (INCLUDES DIAGNOSIS AND REMOVE PCM)

LABOR TIME: 0.6 HOUR

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.

STALL ON LAUNCH/POOR THROTTLE RESPONSE (REVISED PROM)