TSB : 1975-79 AMC

Details

Remove screws from choke cover bracket. Rotate thermostatic choke housing counterclockwise to lightly close choke plate and turn additional 90 degrees. Lightly tighten screws. Disconnect choke inlet tube. Position fast idle speed screw on 2nd step of fast idle cam. Start engine without touching accelerator pedal. Turn fast idle speed screw counterclockwise 3 turns. Insert specified gauge to measure clearance between higher edge of choke plate and air horn wall. To adjust clearance on 1975-77 models, carefully twist connecting arm between choke linkage and choke valve pull-down assembly. On 1978-79 models, turn screw on bottom side of choke valve pull-down assembly. See Fig 1 . On all models, turn engine off and reconnect heat inlet tube. Do not reset choke cover until after fast idle cam linkage adjustment is made. NOTE: Fast idle cam linkage must be checked and adjusted after choke valve pull-down adjustment. Do not adjust automatic choke until after fast idle cam is adjusted. Fig 1: Adjusting 1978-79 AMC Choke Valve Pull-Down Clearance Courtesy of FORD MOTOR CO.