Backpressure EGR Valves - Identifying Features
Number: 83-I-46Section: VIt
Date: March, 1983
Subject: NEW IDENTIFICATION FEATURE FOR BACKPRESSURE EGR VALVES - 1983 3.8L V6 (VIN CODE A) CALIFORNIA ONLY ENGINES
TO: ALL CHEVROLET DEALERS
New EGR Valve:
Internal revisions have been made to backpressure EGR valves used on this engine. It is no longer possible to identify a positive or negative type valve by visual inspection of the diaphragm plate, as has been done in the past. The new EGR valve has the letter "N" (for negative backpressure), or "P" (for positive backpressure), on the line below the model identification number, as shown. The present shop manual service procedure has not been changed.