Exhaust System - Odor Repair (Application Chart)
88chevy15GMC NUMBER: 88-T-153
GROUP: 6E - Engine Emission
DATE: August, 1988
CORPORATE
NUMBER: 836531
SUBJECT: EXHAUST ODOR REPAIR BULLETIN INDEX
MODELS: 1986-88 M VAN WITH 4.3L ENGINE (VIN CODE Z)
Some 1986-87 and 1988 M-vans prior to GMC VIN 523374 equipped with 4.3L (VIN Code Z) engines may exhibit an exhaust odor often described as sulfur or rotten egg smell at idle following sustained highway driving or trailer towing. This bulletin includes a table which summarizes the various service fixes intended to address this condition depending on the model year of the vehicle.
The table lists the appropriate service procedures, calibration PROM, applicable service parts and a bulletin number to reference for complete installation instructions. See Table for applicable Labor Operations and Labor Time.