STALL, TIP-IN LAG OR ROUGH RUNNING ON COLD START

MODELS/YEARS 1988-90 CUTLASS CALAIS AND 1990 CUTLASS SUPREME WITH THE QUAD 4 ENGINE

Some 1988-90 Cutlass Calais models and 1990 Cutlass Supreme models with Quad 4 engine, (VIN Codes A and D), may exhibit one or more of the following conditions for the first minute of cold, heavy throttle driveaway during ambient temperatures of 50-80 degrees Fahrenheit.

- Stall when put in gear - Tip-in hesitation after immediately put in gear. - Reduced cold engine driveability (miss, rough running or backfire).

If any of the above conditions cannot be repaired through proper service manual diagnosis, refer to Dealer Technical Bulletin 88-T-32 for injector harness routing and refer to Dealer Technical Bulletin 89-T-45 for 1988-89 Cutlass Calais models for the latest mem-cal. Inspect vacuum lines, especially the map sensor, for kinks or restrictions. it may be necessary to inspect the intake valves for carbon deposits.

To inspect the intake valves effectively, remove the intake manifold. If upon inspection the valves are found to have substantial deposit formation, it will be necessary to decarbon the intake valves using the Kent-Moore Carbon Blaster 11, J 38375 along with adapter kit J 38743 to remove these deposits. Operating instructions are included with the tools.

Once deposits are removed, the owner of the vehicle should be advised to use fuels advertised to control deposit formation in engines.

Attached to this bulletin is an order form for the carbon blaster and adapter kit.

WARRANTY INFORMATION:

Labor Operation Number: T4674 Labor Time: Cutlass Supreme Models 2.0 hours Cutlass Calais Models 1.6 hours 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.