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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 >> Preliminary Idle Speed and Mixture Adjustment >> All Models (except Vega)

All Models (except Vega)

  1. Turn mixture screws four full turns from lightly seated position. Adjust idle stop solenoid or carburetor idle speed screw to obtain initial idle RPM as specified.
  2. Equally adjust mixture screws in (clockwise) to lean position, or 1/4 turn rich (counterclockwise) when specified, to obtain final idle RPM. Reconnect distributor vacuum advance hose and fuel tank line to vapor canister. Install new limiter caps.
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