What are the consequences of a faulty PCV valve?
2 Answers
PCV valve damage can lead to consequences such as white smoke coming from the exhaust pipe, accelerated wear, and unstable idle. In severe cases, it can cause engine idle vibration, poor acceleration, excessive oil consumption, difficulty starting the car, and ultimately shorten the engine's lifespan. Below is additional information: 1. PCV Valve: The PCV valve is a metering control valve installed between the crankcase ventilation system and the intake system. The PCV is controlled by vacuum and regulates the flow of oil fumes from the crankcase ventilation system into the intake system. The flow rate is higher when the engine is running at high speed compared to low speed. Additionally, the PCV valve should cut off ventilation to prevent crankcase explosion in the event of engine backfire. 2. Inspection Method: With the engine idling, clamp the hose between the PCV valve and the vacuum source. If the engine speed drops by 50r/min or more, it is normal. Otherwise, check if the PCV valve or hose is clogged. Also, remove the PCV valve and feel for strong vacuum suction at the intake port, which indicates normal operation.
A faulty PCV valve can indeed be quite troublesome, as I've personally experienced with my older car. Its primary function is to regulate the recirculation of blow-by gases from the engine crankcase. When it malfunctions, it causes rough idling - the car shakes violently when stopped - and you'll often feel a noticeable lack of power while driving. Fuel consumption spikes because the gases flow back into the intake system, contaminating the engine oil and increasing carbon buildup in the engine. If left unrepaired long-term, it could lead to serious engine problems requiring expensive repairs. Don't underestimate this small component - it directly affects your vehicle's performance and longevity. I recommend visiting a 4S shop or reputable repair shop immediately if you notice symptoms like the check engine light coming on or unusual exhaust smells. For DIYers, sometimes simply replacing the valve may suffice, but it's best to have a mechanic inspect the entire system to confirm the root cause. This is a small investment that can save you significant headaches if addressed early.
