Technician A says that a 3 x 5 card should be held against the oil fill opening if the PCV system is operating correctly. Technician B says that if a PCV valve rattles, it definitely is good. Which technician is correct?
A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question

Quizplus · Accepted Answer

Technician A is correct. If the PCV system is operating correctly, holding a 3 x 5 card against the oil fill opening should create a vacuum and hold the card against the opening. Technician B is incorrect. Just because the PCV valve rattles, it does not mean that it is good. A PCV valve can rattle and still be stuck open, which would result in poor engine performance.

Technician a Says That a 3 X 5 Card Should