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1974 RX-4 & Pickup

  1. Pull choke knob out fully. Warm engine to normal operating temperature, then turn engine off. Push in on vacuum break diaphragm stem and hold in this position.
  2. Install angle gauge on choke valve operating lever and determine choke valve opening angle (from horizontal plane). See CHOKE VALVE OPENING ANGLE table  to determine that choke valve angle is correct.
    Fig 1: 1974-77 Choke Valve Clearance Based On Ambient Temperature
    G09326836Courtesy of NOT AVAILABLE
CHOKE VALVE OPENING ANGLE

Outside Air Temperature °F (°C) Man. Trans. Opening Angle Auto. Trans. Opening Angle
41 (5) 0 3
50(10) 5 13
59(15) 15 13
68(20) 25 33
77(25) 35 43
86(30) 45 53