STALL,TIP-IN, HES. AND/OR STORED ENGINE CODES (PROMS)

MODELS/YEARS 1987 FIRENZA, 1987-88 CUTLASS CIERA AND 1988 CUTLASS SUPREME

This bulletin supplements Dealer Technical Bulletin 88-T-147B. Both 88-T-147B and 88-T-147C should be retained in your binder.

The following paragraph should be inserted at the end of Step 3 Item C on Page 2 of Dealer Technical Bulletin 88-T-147B.

Clean throttle body I.D. bore in the area behind the throttle plate. Use a shop towel with GM Top Engine Cleaner, P/N 1052626, or AC-Delco Carburetor Tune-Up Conditioner, P/N X66-A, or equivalent not containing Methyl Ethyl Ketone.

The following paragraph should be inserted at the end of Step 3 Item I on Page 2 of Dealer Technical Bulletin 88-T-147B.

Install Tech 1 Scan tool, CAMS or equivalent. Program into Scan-Tool 1989 model year.

With engine stabilized and in closed loop, the IAC motor position values should be between 9- 20 counts for a desired RPM of 700 Auto. Trans. and 850 Manual Trans. If not, the adjustments may be tailored as follows, by adjusting the minimum air rate screw.

- More throttle valve opening lower IAC valve counts

- Less throttle valve opening higher IAC valve counts

IMPORTANT: Throttle angle must be equal to zero.

In addition the Warranty Information has been updated as follows:

WARRANTY INFORMATION:

Labor Operation Number: J5670 (for MAF/MAT replacement) Labor Operation Number: T1492 (for MEM-CAL change) Labor Time: 87-88 Cutlass Ciera 1. 1 Hour 88 Cutlass Supreme 1.0 Hour 87 Firenza 1.1 Hour Add 0.1 hour to the above times to adjust minimum idle

Trouble Code: 92

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.