TCC - Loss of Lock Up at Road Load Speeds
84buick04 Bulletin 84-6E-26Date Oct. '84
Ref. No. 84-274-6E
SUBJECT: LOSS OF TORQUE CONVERTER CLUTCH (TCC) AT ROAD SPEED
MODELS AFFECTED: 1984 CENTURYS EQUIPPED WITH 3.0L (VIN CODE E) ENGINES AND 1226519 ECM
Some 1984 3.0L Centurys may exhibit loss of [1][2]Torque Converter Clutch at road load speeds. The cause for loss of Torque Converter Clutch (TCC) is engine temperatures are cooling off to below 82~C (celsius) during cold weather operation. When temperatures go below 82~C (celsius) the PROM program inhibits torque convertor clutch.
To correct, install a new service PROM part number 1226999 as per the 1984 Chassis Service Manual. This PROM lowers the minimum engine temperature required for TCC operation. Scan ID 6999.