While the engine is running, a tech pulls the PCV valve out of the valve opening and places his finger over the valve. No vacuum is felt. Tech A says that the PCV valve could be stuck closed. Tech B says that the hose between the intake manifold and the PCV valve could be plugged. Who is right?
Final Answer: Tech B
A lack of vacuum at the PCV valve during engine operation suggests a potentially blocked intake manifold hose. Tech B is correct.
Explanation:
In this scenario, Tech B is correct. When the technician places their finger over the PCV (Positive Crankcase Ventilation) valve opening and feels no vacuum while the engine is running, it indicates that the hose between the intake manifold and the PCV valve could be plugged. The PCV system relies on creating a vacuum in the crankcase to remove harmful gases and maintain engine efficiency. If there's no vacuum at the PCV valve, it suggests that there's an obstruction in the hose preventing the proper airflow.
Tech A's suggestion that the PCV valve might be stuck closed is less likely to cause the absence of vacuum at the valve opening. A stuck-closed PCV valve usually leads to increased crankcase pressure, which can result in oil leaks and other issues, but it wouldn't cause a lack of vacuum at the valve opening.
Therefore, Tech B's explanation aligns with the observed symptom, indicating a potential blockage in the hose, which can hinder the PCV system's function.
So, the correct option is Tech B.