VEHICLE EMITS SULFUR SMELL REPLACE CAT. CONVERTER

Subject: VEHICLE EMITS SULFUR SMELL (ROTTEN EGG SMELL - REPLACE CATALYTIC CONVERTER)

Models Affected: 1990-91 GRAND AM MODELS WITH 2.5L ENGINE

Condition: Some 1990-91 Grand Am models may emit a sulfur odor (rotten egg smell).

Cause: The vehicle emits a sulfur odor due to a combination of high sulfur level in the fuel and the particular driving schedule of the vehicle involved.

Correction: Replace the existing (Beaded) catalytic converter. The monolith converter utilizes technology that cannot be applied to the beaded converter to reduce the emission of Hydrogen Sulfide gas, the source of the sulfur smell. Refer to "Parts Information" below for new part number.

Service Information: Refer to Section 6F for catalytic converter replacement.

Parts Information: P/N 25144088 - Monolith catalytic converter

Parts are expected to be available on January 6, 1992. In case of limited inventory, parts will be placed on 400 Control to waive VIP surcharges. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. However, the part will be shipped premium transportation at dealer's expense and all other order types will be placed on backorder until the 400 control is removed.

Labor Operation Number: L2300

Labor Time: See current Labor Time Guide.

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.