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Home >> Plymouth >> 1985 >> Horizon Base, 2.2 C, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> 1.6 & 2.2L Feedback Carburetor System >> Testing >> Electronic Spark Control System Tests >> Spark Control Computer Spark Test

Spark Control Computer Spark Test

  1. Warm engine to normal operating temperature. Set basic timing. Disconnect carburetor switch or unground it. Be sure 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 1985 SPARK ADVANCE TEST SPECIFICATIONS table.
    NOTE: On some systems with an accumulator (timer), the specified time must be reached with the carburetor switch ungrounded before checking for specified spark advance.
  3. If computer fails to obtain settings, replace computer.
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