HIGH OIL CONSUMPTION CONCERN CORRECTIVE SERVICE PROCEDURE

VEHICLES AFFECTED: 1987-90 J/L CARS

Some owners of 1987-90 J and L cars with 2.0L, or 2.2L engines have commented on less-than-acceptable engine oil consumption. Many oil consumption concerns have been traced to irregularities in the positive crankcase ventilation system (P.C.V.). Possible high oil consumption contributors include:

1. Missing "O" rings.

2. Cut, misinstalled "O" rings.

3. Incorrect P.C.V. valve.

Refer to the attached chart for the correct service part numbers. When installing a P.C.V. valve, lightly oil the "O" rings. Seat the P.C.V. valve into the cover by hand. Inspect to see that the bottom "O" ring is not showing; then install the retainer cap.

Some after-market P.C.V. valves are available that will fit into the valve rocker covers but will allow too much airflow and cause high oil consumption. If a P.C.V. valve replacement is required, always use part number 25097214, which is identified "AC Spark Plug, CV-900C".

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.