Hd11 Check For Base Engine Concerns

NOTE: The engine temperature may affect the results.

This step determines if there are any base engine concerns that may have caused the misfire DTC or drive concern.
Carry out the following tests in order to evaluate base engine integrity:
- Carry out engine compression and leakdown tests. Refer to the MECHANICAL - GENERAL
- Carry out valve train analysis. Refer to the MECHANICAL - GENERAL
- Check the positive crankcase ventilation (PCV) system. Refer to the MECHANICAL - GENERAL
- Check for possible leakage points. Refer to the MECHANICAL - GENERAL
Is a concern present?
- Yes: REPAIR as necessary. REFER to the MECHANICAL - GENERAL .
  CLEAR the DTCs. REPEAT the self-test.
- No: GO to HD12 .