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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 >> Final Curb Idle Speed Adjustment >> 2-Bbl. Carburetor, Vega (1973)

2-Bbl. Carburetor, Vega (1973)

  1. With engine running, disconnect idle stop solenoid wire. Adjust carburetor low idle speed screw to gain specified low idle speed RPM.
  2. Set dwell and timing, recheck low idle speed RPM. Reconnect solenoid wire. Adjust screw on throttle to specified curb idle speed RPM.
NOTE: Combination Emission Control Valve adjustment may be applicable to carburetor adjustments being made. Valve is a component of some Controlled Combustion systems and should not be used to set idle speed.
CAUTION: If Combination Emission Control Valve is used to set engine idle, or is adjusted out of limits specified, decreased engine braking and poor performance may result.
Final Curb Idle Speed Specifications

Application Low Idle Speed RPM Curb Idle Speed RPM
140"
  Auto. Trans. (1)550 750
Man. Trans. (1) 800 (2) 1000
250"
  Auto. Trans. 500 600
Man. Trans. 500 700
307"
  Auto. Trans. 500 600
Man. Trans. 500 900
350" 2-Bbl.
  Auto. Trans. 400 600
Man. Trans. 400 900
350" 4-Bbl.
  Auto. Trans. 500 600
Man. Trans. 500 900
350" 4-Bbl. High Performance
  Auto. Trans. (3) 700
400"
  Auto. Trans. 500 600
454"
  Auto. Trans. 500 600
Man. Trans. 500 900
(1) Set at 550 RPM on 2-Bbl. Vega, all vehicles set with solenoid de-engergized.
(2) GT option, set at 1200 RPM.
(3) 9.0-1 compression.