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Home >> Chevrolet >> 1968 >> Chevy II 2.5L Eng >> Repair and Diagnosis (Single Page) >> Engine Performance >> Tune-Up >> Exhaust Emission Systems - Tune-Up >> Idle Speed & Mixture Adjustment >> All Models, 307" & 400"/265 HP (1970)

All Models, 307" & 400"/265 HP (1970)

  1. Disconnect and plug distributor vacuum advance line. Turn mixture screws in (clockwise) until lightly seated, then turn out (counterclockwise) four turns.
  2. Adjust carburetor idle speed screw to obtain 800 RPM with manual transmission in Neutral, and adjust solenoid screw to obtain 630 RPM with automatic transmission in "D" position. Adjust mixture screws equally in (clockwise) to obtain 600 RPM for automatic transmission (in "D") and 700 RPM for manual transmission (in Neutral).
  3. On vehicles equipped with automatic transmission, disconnect electrical connections to solenoid, set carburetor idle speed screw to obtain 450 RPM and connect solenoid. Reconnect distributor vacuum line.
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