FALSE CODE 43 SET NEW SERVICE PROM P/N'S

VEHICLES AFFECTED: 1987 A,J, AND L CARS WITH 2.8L PFI ENGINE (VIN CODE W)

Some 1987 A, J, and L cars equipped with the new 2.8L PFI engine may set a false Code 43. The false code will be set under a deep, part throttle crowd between 3400 and 4400 engine RPM. As a result of setting this code, the "service engine soon" light will come on and generally will stay on until the ignition key is turned off. A Code 43 will be stored.

To service customer complaints, perform service diagnosis for Code 43 as defined in the Service Manual, Section 6E3, to correct any of the following conditions: faulty knock sensor, "intermittents", faulty connectipns, or open or shorted wiring problems.

To correct false Code 43, a new part number Mem-Cal will be required.

The part numbers and model applications are shown in the following chart:

* TRANSAXLE EMISSION MEM-CALS MODELS TRANS. RATIO CALIBRATION REMARKS P/N A-CARS ------ ----- ----- ----------- ------- --- 1AW19/27 AUTO-3 2.84 FED. 16072930 2AF19/27 AUTO-3 2.84 FED. 16072930 2AG19 AUTO-3 2.84 FED. 16072930 3AJ/AM19/37 AUTO-3 2.84 FED. 16072936 4AH19/27 AUTO-3 2.84 FED. 16072936 4AL19/27 AUTO-3 2.84 FED. 16072936

1AW19/27 AUTO-4 3.33 FED. 16072973 2AF19/27 AUTO-4 3.33 FED. EXC. STE & SE 16072973 2AG19 AUTO-4 3.33 FED. EXC. STE & SE 16072973 3AJ/AM19/37 AUTO-4 3.33 FED. 16072977 4AH19/27 AUTO-4 3.33 FED. 16072977 4AL19/27 AUTO-4 3.33 FED. 16072977

1AW19/27 MAN.-5 3.61 FED. 16072993 2AF19 MAN.-5 3.61 FED. 16072993 2AG19 MAN.-5 3.61 FED. 16072993

1AW3 5 AUTO-4 3.33 FED. 16073023 2AF/AG35 AUTO-4 3.33 FED. 16073023 2AF/AG19 AUTO-4 3.33 FED. STE & SE MODELS 16073023 3AJ/AM35 AUTO-4 3.33 FED. 16073027 4AH3 5 AUTO-4 3.33 FED. 16073027 4AL3 5 AUTO-4 3.33 FED. 16073027

1AW3 5 MAN.-5 3.61 FED. 16073140 2AF3 5 MAN.-5 3.61 FED. 16073140

1AW19/27 AUTO-3 3.18 FED. 16072952 2AF19/27 AUTO-3 3.18 FED. 16072952 2AG 19 AUTO-3 3.18 FED. 16072952

3AJZAM19/37 AUTO-3 3.18 FED. 16072957 4AH19/27 AUTO-3 3.18 FED. 16072957 4AL19/27 AUTO-3 3.18 FED. 16072957

1AW3 5 AUTO-3 3.18 FED. 16073003 2AF/AG35 AUTO-3 3.18 FED. 16073003 3AJ/AM35 AUTO-3 3.18 FED. 16073007 4AH3 5 AUTO-3 3.18 FED. 16073007 4AL3 5 AUTO-3 3.18 FED. 16073007

* MODELS TRANSAXLE EMISSION MEM-CALS J-CARS TRANS. RATIO CALIBRATION REMARKS P/N -------- ----- ----- ----------- -------- ---

3JAOO AUTO-3 FED. ALL OLDS J CARS 16073192 1JE67 AUTO-3 FED. CAVALI, FR CONVERTIBLE 16073192 1 JFDO AUTO-3 FED. CAVALIER Z24 16073202 3 JDOO FIRENZA GT

3 JAOO MAN.-5 FED. ALL OLDS J CARS 16073212 1JE67 MAN.-5 FED. CAVALIER CONVERTIBLE 16073212 1 JFOO MAN.-5 FED. CAVALIER Z24 16073222

MODELS TRANSAXLE EMISSION MEM-CALS L-CARS TRANS. RATIO CALIBRATION REMARKS P/N ------ ------ ----- ----------- ------- ---

1LA00 AUTO-3 3.18 FED. Beretta GT 16073150 1LA00 AUTO-3 3.18 FED. Beretta Corsica 16073162 Tempest

1LA00 MAN.-5 3.61 FED. Beretta Corsica 16073172 Tempest 1LA00 MAN.-5 3.61 FED. Beretta GT 16073182

* MODEL IDENTIFICATION P.S.B. 87-628-103

THE MAKE IS IDENTIFIED BY VIN POSITION #3. EG.1 = CHEV 2 = PONTIAC 3 = OLDS 4 = BUICK

THE BODY TYPE IS IDENTIFIED BY VIN POSITION #4.

EG. A = A BODY J = J BODY L = L BODY

HE SERIES IS IDENTIFIED BY VIN POSITION #5. EG. W = CELEBRITY

THE BODY STYLE IS IDENTIFIED BY VIN POSITION #6. EG. 1 = STYLE 11, 27, 37, 47, 57, 97 2 = STYLE 07, 08, 77, 87 3 = STYLE 67 5 = STYLE 19, 23, 33, 69 6 = STYLE 68 8 = STYLE 35

EXAMPLES OF MODEL ID A - CARS

FROM THE VIN: 1AW5 = 1AW19 1AWI = 1AW27 3AJI = 3AJ37 4AHB = 4AH35

ADDITIONAL INFORMATION ON VEHICLE IDENTIFICATION NUMBERS IS OUTLINED IN PRODUCT SERVICE BULLETIN 87-0-103.

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.