Disassembly Idle Mixture Screw Plug
- Idle mixture screw plugs should be removed (if equipped) prior to disassembly of carburetor. Invert carburetor. Using hacksaw, saw 2 parallel cut areas in throttle body between locator points near idle mixture plug. See Fig 1
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Courtesy of GENERAL MOTORS CORP.
- Distance between cut areas should be near size of punch to be used for plug removal. Cut downward to the plug. Cut area should not exceed more than 1/8" beyond locator points.
- Place flat punch near end of cut areas. Holding punch at a 45 degree angle, drive punch inward toward throttle body to break casting away. Use a center punch to break plug and expose idle mixture screw. Repeat procedure for remaining plug.