NEW DESIGN SPARK PLUG SERVICE INFORMATION

SUBJECT: NEW DESIGN SPARK PLUG (SERVICE INFORMATION)

VEHICLES AFFECTED: 1989-91 C,E,H AND W MODELS WITH 3800 AND 3800 T.P.I. (VIN C AND L ENGINES)

This bulletin is to inform technicians of a change in the service replacement spark plug for the 1989 through 1991, H Model, 1989 - 1990 C Model with the 3800 (Code C) Engine, 1990 and 1991, C, W and E Models with the 3800 T.P.I. (Code L) Engine.

When servicing vehicles listed above, technicians may use the new Service Replacement Spark Plug R45LTS6, Service Package Number 5614224.

Engines produced after March 1, 1991 will have the new R45LTS6 Spark Plug installed. When replacing spark plugs in vehicles with the old design Spark Plug Number R44LTS6, all spark plugs may be replaced with the new Service Spark Plug R45LTS6.

NOTE: ------ Do not mix the two spark plug numbers in a vehicle.

As service stock of the R44LTS6 Spark Plug is exhausted, stock will be replaced with the new Spark Plug R45LTS6.

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.