LEMON Manuals: Even more car manuals for everyone
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, 153" 4 Cylinder (1970)

All Models, 153" 4 Cylinder (1970)

  1. Disconnect and plug distributor vacuum line. Set mixture screw to obtain maximum idle RPM.
  2. Adjust idle speed screw to obtain 650 RPM (automatic transmission in "D" position) or 750 RPM (manual transmission in Neutral).
  3. Adjust mixture screw in (clockwise) to obtain 20 RPM idle drop, then back out screw 14 turn. Readjust idle speed screw to specified RPM if necessary. Reconnect distributor vacuum line.
scientia non olet · About LEMON Manuals