Crankcase pressure forcing crankcase gases through the clean air hose and into the air cleaner is being discussed. Technician A says the cause may be an excessive amount of blowby. Technician B says the cause may be a restricted PCV valve. Who is correct?

Question

Quizplus · Accepted Answer

Both Technician A and Technician B are correct. Excessive blowby can increase crankcase pressure, forcing gases through the clean air hose into the air cleaner. Similarly, a restricted PCV (Positive Crankcase Ventilation) valve can cause increased crankcase pressure for the same reason, as it fails to properly vent these gases.

Crankcase Pressure Forcing Crankcase Gases Through the Clean Air Hose