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Home >> Plymouth >> 1981 >> Horizon Base, 2.2L Eng VIN B, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electronic Fuel Control >> Testing >> Electronic Spark Control System Tests >> Spark Control Computer Spark Test
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Spark Control Computer Spark Test

  1. Warm engine to normal operating temperature. Disconnect carburetor switch or unground it. Be sure coolant temperature switch/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. 
    NOTE: On some systems with an accumulator, the specified time must be reached with the carburetor switch ungrounded before checking for specified spark advance schedule.
    Spark Advance Test Specifications (1)

    Computer Part No. (2)Spark Advance
    5212101 38°
    5213111 35°
    5213268 43°
    5213128 28°
    5213133 25°
    5213138 23°
    5213143 25°
    5213249 33°
    5213343 25°
    5213345 25°
    (1) Engine speed 2000 RPM and 16 in. Hg vacuum applied.
    (2) All readings ±4°. If amount of advance differs here from emission control label, use label as accurate listing.
  3. If computer fails to obtain settings, replace computer.
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