Question

the most common pcv system problem is a __________ leak.

○ a. gas
○ b. oil
○ c. fuel
○ d. vacuum

Explanation:

The PCV (Positive Crankcase Ventilation) system relies on vacuum to function properly. A vacuum leak disrupts its operation, which is a common issue. Gas leaks are less typical as the system's main concern is crankcase gases managed via vacuum. Oil leaks are more related to seals in other engine parts. Fuel leaks pertain to the fuel system.

Answer:

d. Vacuum