What is the inspection method for the PCV valve?
3 Answers
The inspection method for the PCV valve is as follows: 1. First method: Let the engine idle, remove the PCV valve from the cylinder cover hose, and check if the PCV valve is clogged. If you place your hand on the PCV valve interface, you can feel a strong vacuum suction. 2. Second method: After reinstalling the PCV valve, remove the crankcase intake pipe from the air filter, lightly cover the pipe opening with a thin piece of paper. When the pressure in the crankcase decreases (after about 1 minute), the thin paper should be noticeably sucked towards the pipe opening. Additionally, after stopping the engine, remove the PCV valve and shake it by hand to check. If you hear a "click" sound, it indicates that the PCV valve is flexible and usable.
I just checked my car's PCV valve, and the method is quite simple: First, turn off the engine, open the hood, and locate the valve, usually a small component installed on top of the engine. Then, disconnect the hose connected to the valve and try shaking the valve body. If you hear a clicking sound from the small ball inside, it means it's working properly. Next, perform a suction test by gently sucking on one end of the hose to check if the valve is clear. If there's significant resistance or blockage, you should take note. Also, inspect the hose for aging or cracks, as these can cause air leaks. Finally, start the engine and let it idle, then listen for any noticeable suction sound when removing the hose—if there isn't any, there might be a fault. I usually glance at these areas every month to prevent carbon buildup and increased fuel consumption. If it gets clogged, it can cause serious issues like oil accumulation in the engine or excessive emissions. Regular maintenance shouldn’t be skipped to avoid breakdowns and costly repairs—plus, working on it with a reliable friend can be fun.
I've been driving for years, and checking the PCV valve requires attention to detail: After turning off the engine, open the hood and locate the small valve near the valve cover—don't mistake its position. Remove the hose, shake the valve near your ear, and listen for a clicking sound, which indicates it's functioning properly. If there's no sound, it might be stuck; then, use your mouth to suck on the hose to feel for air pressure changes—smooth airflow is good, otherwise, it needs cleaning. When the car is idling, try pulling the hose; if you hear a hissing suction sound, the valve is working fine. Check if the hose connections are loose or cracked, and replace them if they're aged. This valve is often overlooked, and long-term neglect can lead to crankcase pressure buildup, damaging seals or causing engine vibration. I make it a habit to check it every quarter, especially when changing the oil—it saves time and ensures safety.
