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Home >> American Motors >> 1982 >> Spirit Base, 2D Hatchback, 2.5L Eng VIN B, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Computer Controlled Catalytic Converter >> Diagnostic Procedure >> System Performance Check

System Performance Check

  1. This check verifies that C-4 system is functioning properly. This check should always be made after any repair to C-4 system.
  2. The oxygen sensor will cool off after only a short period of time while engine is idling. This will cause engine to go into open loop. To restore closed loop mode, run engine at part throttle several minutes and accelerate from idle to part throttle several times.
    NOTE: Although there are many charts connected with C-4 diagnosis, only 2 charts are needed to prove the system is operating properly. Normally only 3 charts are necessary to find a problem, if one exists.
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