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Home › GMC › 1982 › S15 Pickup 2.8L Eng VIN B, Automatic Trans › Repair and Diagnosis › Engine Mechanical › Auxiliary Emission Control Systems › Computer Command Control › Diagnostic Procedure › System Checks › 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 driving wheels. On engines equipped with Varajet carburetors (E2SE model), remove bowl vent line and plug hose at carburetor during check. Reconnect hose 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 part throttle for several minutes and accelerate from idle to part throttle several times.
    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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