ECM - Application Change
Bulletin 85-6E-21Date Oct.. '85
Ref. No. 85-300-6E
SUBJECT: ECM APPLICATION CHANGE
MODELS AFFECTED: SOME 1985 RIVIERAS EQUIPPED WITH 5.0L ENGINE (VIN CODE Y)
A change was made in the ECM application used with the 5.0L V-8 engine (VIN Code Y) in some 1985 Buick Rivieras. The diagnostics for both units remains the same; however, the ECMs are not interchangeable. The second type ECM, part number 1227076 replaces the first type ECM, part number 1226866 on Buick Rivieras built after serial number FE431276.