What are the symptoms of a faulty car PVC valve?
3 Answers
When the problem occurs, after starting the motor vehicle, it will experience shaking. The idle speed will be either too high or too low. A large amount of white smoke will appear from the vehicle's tailpipe. There will be insufficient power when the vehicle is in motion. The fuel consumption of the motor vehicle will increase. Specific details are as follows: Once the motor vehicle experiences these issues, it must be repaired. Otherwise, it will affect the use of the motor vehicle, because any problem with the motor vehicle indicates a fault. If not repaired in time, the problem will worsen, affecting the normal use of the motor vehicle.
When driving my old car, the idle speed became extremely unstable, and I could feel the car shaking when parked. The acceleration wasn't as smooth as before, and the fuel consumption suddenly increased a lot. I took it to the repair shop, and the mechanic told me that the PVC valve was broken. This valve controls the exhaust gas recirculation in the engine, and when it fails, it causes pressure imbalance. Engine oil might leak or deteriorate, and the dashboard warning light sometimes comes on. In severe cases, black smoke with a strong odor comes from the exhaust, making the air quality poor and driving uncomfortable. Detecting it early could save me from major repairs. Now, I regularly check the engine compartment to ensure the valve is functioning properly and not clogged, which gives me peace of mind. Driving safety comes first, and such issues shouldn't be delayed.
With twenty years of car repair experience, I've seen countless cases of PVC valve failures. Typical symptoms include fluctuating idle speed, noticeable jerking during acceleration or when starting the car, and a lack of power resembling a misfire. Fuel consumption is significantly higher than usual, and exhaust emissions exceed standards, sometimes accompanied by black or blue smoke. A faulty valve disrupts crankcase ventilation, causing poor exhaust recirculation and rapid oil contamination, which increases maintenance costs due to frequent oil changes. During inspection, simply removing the valve to listen for sounds or checking vacuum levels can easily diagnose the issue. Replacing the valve promptly is cost-effective, but delays can damage engine spark plugs. I recommend car owners check the valve condition during annual maintenance.
