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Spark Control Computer Spark Test

  1. Warm engine to normal operating temperature. Disconnect carburetor switch or unground it by placing a thin piece of cardboard between curb idle adjusting screw and switch. Be sure coolant temperature sensor/switch 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.
  3. If computer fails to obtain settings, replace computer.
SPARK ADVANCE TEST SPECIFICATIONS (1)

Application Computer No. Degrees of Advance
2-Bbl.
Fed. 4289673 42-50
Calif. 4289673/4289811 42-50
4-Bbl. 4289819/4289821 34-42
(1) With engine speed at 2000 RPM and 16 in. Hg vacuum applied.
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