Diesel Engine - Altitude Performance Adjustment: Overview
Model Year 1983Bulletin No. 83-120
File In Group 60
Number 29
Date April '83
SUBJECT: 1983 ALTITUDE PERFORMANCE ADJUSTMENTS FOR DIESEL ENGINES
A. 4.3L V6 DIESEL ENGINE VIN CODE "T"
1983 Centurys equipped with 4.3L V6 diesel engines will be manufactured with either high or low altitude diesel emission systems. Cars equipped with the high altitude emission system will be invoiced with option NA6. The type of system can also be identified by the emission label attached to the fan shroud. The label will indicate that the car was built for primary use at either high or low altitude. These procedures are considered altitude performance adjustments and apply only to in-use vehicles. They should not be used to modify vehicles prior to sale.