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Spark Control Computer Spark Advance Test

  1. Warm engine to normal operating temperature. Disconnect carburetor switch or unground it by placing a piece of paper between curb idle adjusting screw and switch. Be sure that coolant temperature sensor is connected and working properly.
  2. Remove and plug vacuum hose at vacuum transducer. Connect an auxiliary vacuum supply to vacuum transducer and apply 16 in. Hg. Increase engine speed to 2000 RPM and wait 1 minute before checking specifications. Advance specifications are in addition to basic advance. See Spark Advance Test Specifications table  .
    Spark Advance Test Specifications

    Computer Part No. Spark Advance (1)
    4145907 30-38°
    4145980 30-38°
    4145996 30-38°
    4145998 30-38°
    4289034 16-24°
    (1) With engine speed at 2000 RPM and 16 in. Hg vacuum applied.
  3. If computer fails to obtain settings, replace computer.
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