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Idle Adjustment

See Tune-Up Charts for specifications on individual car models. With engine at normal operating temperature and vacuum gauge, tachometer and CO meter connected, adjust idle to specified idle RPM with idle speed adjusting screw. Then turn idle mixture screw to obtain maximum vacuum gauge reading. Adjust engine speed to specified RPM using idle speed screw, and again adjust mixture screw to obtain maximum vacuum reading. Now turn idle mixture screw to specified mixture for each engine (see following chart).

(1) Idle Mixture Setting

Engine CO% 1972 CO% 1973
3K-C 2-3 1-4
2T-C 2-3 1-4
18R-C 2-3 1-4
4M 1-3 1-3
F 2-3 1-3
(1) - These are Factory Inspection Standards, which are more severe than those specified by different State regulations. Idle CO may exceed factory standards, but adjustment should be made within State Regulation Values.
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