Engine - High Oil Consumption
90chevy19Number: 90-236-6A
Section: 6A
Date: May 1990
Corp. Bulletin No.: 036801
Subject: CONCERN OF HIGH OIL CONSUMPTION
Model and Year: 1987-89 J, L CAR WITH 2.0L (VIN CODE 1) ENGINE 1990 J, L CAR WITH 2.2L (VIN CODE G) ENGINE
Some owners of 1987-90 J and L cars with 2.0L or 2.2L engines have commented on lessthan-acceptable engine oil consumption. Many oil consumption concerns have been traced to irregularities in the positive crankcase ventiation 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".
Parts are currently available from GMSPO.
Labor Operation Number: J6000
Labor Time: .2 Hours