Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Chevrolet for this TSB. Call your local Chevrolet dealer's service department & ask for a copy of TSB# RCL/91C50.
Affected Component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL
CALIFORNIA RECALL - GENERAL MOTORS HAS DETERMINED THAT CERTAIN 1991 C/K TRUCKS, M/L AND G VANS WITH 4.3L ENGINES MAY BE EMITTING NON-METHANE HYDROCARBONS IN EXCESS OF CALIFORNIA EMISSION STANDARDS. TO CORRECT THIS CONDITION, DEALERS ARE TO INSTALL A NEW EXHAUST OXYGEN SENSOR. *TW
