For 1990-2009 cars

# ROUGH IDLE AND DRIVEABILITY MASS AIR FLOW SENSOR OPERATION

#### Vehicles Affected: 1985 Oldsmobile and Buick "C" Models Equipped with 3.8L MPFI Engine

Some 1985 Oldsmobile and Buick "C" models equipped with the 3.8L MPFI engine may encounter an idle or driveability condition without turning on the "Service Engine Soon" light. This may be due to the Mass Air Flow Sensor operation, if it has a date code before 0904.

The date code is located on the bar code as indicated by the Example in Figure 1.

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.