Title: Diagnose oil leaks, emissions, and driveability concerns caused by the positive crankcase ventilation (PCV) system; determine needed action.
Course: Automotive Technology III (20104-III) > Section: Engine Performance: Emissions Control Systems Diagnosis and Repair

Diagnosis should include

- checking for the presence of excessive oil in the air induction system
- checking for a plugged vacuum port/line in the PCV
- ensuring the proper PCV valve is used
- checking for proper PCV filter/breather function.

ASE Education Foundation
2017 Automobile Service Technology (AST) Level
VIII. Engine Performance
E. Emissions Control Systems Diagnosis and Repair
Task 1

Process/Skill Questions:

- What is blow-by?
- How might PCV faults cause excessive oil leaks?