CAMPAIGN: INCORRECT CALIBRATION PROM-RETROFIT KIT

GMC NUMBER: 92-E-21 DATE: AUGUST 1992

GROUP: 6E - ENGINE EMISSION

SUBJECT: CALIBRATOR PROM

MODELS: P TRUCKS USING 1992 4.3L ENGINE RETROFIT KIT

GENERAL MOTORS HAS DETERMINED THAT CERTAIN 1992 4.3L (LB4) ENGINE RETROFIT KITS HAD THE 1991 ELECTRONIC CONTROL MODULE AND CALIBRATOR PROM INCORRECTLY PACKAGED WITH THE KITS. ALTHOUGH THE P TRUCKS THAT USED THESE ENGINES DO NOT EXPERIENCE A DRIVEABILITY PROBLEM, IT HAS BEEN DETERMINED THAT THE 1991 CALIBRATION WOULD CAUSE EMITTING POLLUTANTS IN EXCESS OF APPLICABLE 1992 HEAVY DUTY ENGINE EMISSION STANDARDS.

TO CORRECT THIS CONDITION, THE CALIBRATOR PROM MUST BE REPLACED.

VEHICLES INVOLVED

INVOLVED ARE CERTAIN 1992 4.3L (LB4) ENGINE RETROFIT KITS P/N 15638004 FROM ENGINE SERIAL NUMBER 001708 THRU 004020, USED EXCLUSIVELY BY UNITED PARCEL SERVICE.

UNITED PARCEL SERVICE (UPS) CAMPAIGN RESPONSIBILITY

UPS IS TO SERVICE ALL ENGINES SUBJECT TO THIS CAMPAIGN REGARDLESS OF MILEAGE OR AGE OF VEHICLE, FROM THIS TIME FORWARD. WHENEVER AN ENGINE SUBJECT TO THIS CAMPAIGN IS IN YOUR SHOP FOR SERVICE IN THE FUTURE, YOU SHOULD TAKE THE STEPS NECESSARY TO ENSURE THE CAMPAIGN CORRECTION HAS BEEN MADE BEFORE RESELLING OR RELEASING THE VEHICLE.

OWNER NOTIFICATION

THERE WILL BE NO SEPARATE OWNER LETTER SENT OUT WITH THIS CAMPAIGN. DUE TO THE EXCLUSIVE USE BY UPS OF THE INCORRECTLY PACKAGED ENGINE KITS, IT IS ANTICIPATED THAT ALL ENGINES WILL BE CORRECTED BY THIS BULLETIN NOTIFICATION.

SERVICE PROCEDURE

REMOVE THE HEATER, AS NECESSARY. TO REPLACE THE PROM, REFER TO THE 1992 LIGHT DUTY TRUCK FUEL AND EMISSIONS SERVICE MANUAL (X-9236), SECTIONS 3-219 AND 3-220.

SERVICE PARTS INFORMATION

PARTS REQUIRED TO COMPLETE THIS CAMPAIGN WILL BE SHIPPED TO INVOLVED UPS LOCATIONS BY GENERAL MOTORS SERVICE PARTS OPERATION (GMSPO), ON A NO-CHARGE BASIS. ANY QUESTIONS PERTAINING TO PART SHORTAGES, ETC., SHOULD BE DIRECTED TO YOUR UPS CENTRAL PARTS LOCATION.

DO NOT ORDER PARTS FOR THIS CAMPAIGN FROM GENERAL MOTORS SERVICE PARTS OPERATION (GMSPO).

PART NUMBER DESCRIPTION QUANTITY

16168776 CALIBRATOR PROM 1

WARRANTY INFORMATION

UPS SHOULD SUBMIT A WARRANTY CLAIM ON EACH ENGINE COMPLETED UNDER THIS CAMPAIGN.

LABOR OPERATION *TIME NUMBER DESCRIPTION ALLOWANCE

V7500 CALIBRATOR PROM - REPLACE 0.9 HRS.

*TIME INCLUDES 0.1 HOUR ADMINISTRATIVE TIME ALLOWANCE.

CAMPAIGN IDENTIFICATION LABEL

EACH ENGINE CORRECTED IN ACCORDANCE WITH THE INSTRUCTIONS OUTLINED IN THIS DEALER EMISSION BULLETIN WILL REQUIRE A "CAMPAIGN IDENTIFICATION LABEL". EACH LABEL PROVIDES A SPACE TO INCLUDE THE CAMPAIGN NUMBER AND FIVE (5) DIGIT WARRANTY CODE OF THE UPS SERVICE AGENT PERFORMING THE CAMPAIGN SERVICE. THIS INFORMATION MAY BE INSERTED WITH A TYPEWRITER OR BALL POINT PEN. EACH "CAMPAIGN IDENTIFICATION LABEL" IS TO BE LOCATED ON THE RADIATOR CORE SUPPORT IN AN AREA WHICH WILL BE VISIBLE WHEN THE VEHICLE IS BROUGHT IN FOR PERIODIC SERVICING.

APPLY "CAMPAIGN IDENTIFICATION LABEL" ONLY ON A CLEAN, DRY SURFACE.

ADMINISTRATIVE PROCEDURE

PROCEDURES COVERING THIS CAMPAIGN ARE OUTLINED IN SECTION V OF YOUR LOCATIONS "GM TRUCK CLAIMS PROCESSING MANUAL" #P9119.

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.