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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 (Exc. Corvette), 396"/400 HP, 400"/400 HP, & 454"/450 HP (1970)

All Models (Exc. Corvette), 396"/400 HP, 400"/400 HP, & 454"/450 HP (1970)

  1. Remove air cleaner, disconnect and plug distributor vacuum advance line. Adjust mixture screws for maximum idle RPM.
  2. Adjust carburetor idle speed screw to obtain 700 RPM with automatic transmission in "D" position, or 750 RPM with manual transmission in Neutral. Turn one mixture screw in (clockwise) to achieve 20 RPM drop, then back out screw (counterclockwise) 14 turn. Repeat for second mixture screw.
  3. Readjust carburetor idle speed screw to 700 RPM with automatic transmission in "D" position, or 750 RPM with manual transmission in Neutral.
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