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Home >> GMC >> 1983 >> Jimmy 6.2 C >> Repair and Diagnosis >> Engine Performance >> System >> Feedback Carburetor Tests W/Codes >> Diagnostic Procedure >> System Performance Check

System Performance Check

  1. This check verifies that CCC system is functioning correctly. This check should be made after any repair on CCC system.
  2. When performing check, always engage parking brake and block drive wheels. On engines equipped with Varajet carburetors (E2SE model), disconnect bowl vent at carburetor. Reconnect after check is complete.
  3. In some cases, the oxygen sensor will cool off while engine is idling. This causes engine to enter open loop mode. To restore closed loop mode, run engine at fast idle for several minutes to heat oxygen sensor.
NOTE: Although there are many charts connected with CCC diagnosis, only 2 are needed to prove proper system operation. Normally, only 3 charts are necessary to find an existing problem.
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