Engine Controls - Revised Code 53, EGR Vacuum Control
89oldsmobile07SUBJECT REVISED CODE 53 DIAGNOSTIC CHART
FOR 3.0L & 3.8L CARBURETED ENGINES
MODELS/YEARS 1985 CUTLASS SUPREME, CUTLASS CIERA,
DELTA 88 & NINETY-EIGHT
NUMBER: 85-T-26
DATE: May 10, 1985
SECTION: 6E
The Code 53 (EGR vacuum control) diagnostic chart for 3.0L and 3.8L carbureted engines has been revised in the 1985 chassis service manual.
Please update page 6E1-65 of your Firenza, Calais, Cutlass Ciera and Ninety-Eight Chassis Service Manual, Volume 11 and page 6E1-75 of your Cutlass Supreme, Delta 88, Custom Cruiser and Toronado Chassis Service Manual with the chart on the reverse side.