Idle Speed & Mixture (One Carb. Engines): Lincoln

With air conditioner off and hot idle compensator held closed, adjust idle speed by turning the idle air by-pass screw with transmission in Drive. Turn each idle mixture screw alternately and evenly inward until engine speed begins to drop off from lean mixture, then turn screws outward until engine RPM increases and begins to drop off. On Thermactor cars, this is the final setting. On other engines, turn both idle mixture screws inward for maximum engine idle RPM and smoothness. Final setting of screws may vary 1/2 turn between the two screws. Recheck idle speed. If necessary to readjust idle speed, repeat idle mixture adjustment.