Mixture Control Adjustment Procedure: Notes
NOTE:
The Computer Controlled Catalytic Converter System (C-4 System) used on the 1979 231" (VIN 2) engine, is sensitive to any change in mixture control adjustment which, if improperly set, can impair the ability of the system to maintain precise control of carburetor air/fuel mixture. Because of this, the previously used propane enrichment method of idle mixture adjustment may not be used when adjusting carburetors with the "C-4" system.
The following mixture control adjustment procedure should never be performed unless diagnosis indicates the carburetor to be the cause of a driver performance complaint or emission failure, or critical parts such as air horn, float bowl, throttle body, needle and seat, or float are replaced.
The following mixture control adjustment procedure should never be performed unless diagnosis indicates the carburetor to be the cause of a driver performance complaint or emission failure, or critical parts such as air horn, float bowl, throttle body, needle and seat, or float are replaced.