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Bad PCV Valve Symptoms You Should Know

PCV valve of commonly known as Positive Crankcase ventilation is a system that minimized the blowby emission from the engine of the car. It functions to recirculate the gases to ensure that the proper combustion takes place in the vehicle. Most of the people know about this small part of the engine, but what they don’t know is that it can create problems as well. For that, we need to look for bad PCV valve symptoms from time to time. Since these are made of plastic hoses with a spring inside it, you can understand how important it is to pay attention to its setting and care.

How to know if the PCV has gone bad so that you can repair it right after? Well, certain things can let you know if the PCV Valve has gone bad.

Bad PCV Valve Symptoms – Are You Noticing These Changes?

Well, these symptoms will show up when the valve goes bad, and this is what you will see.

Excessive Oil Leaks

One will notice a disproportionate amount of oil consumption and leakage. This valve releases the pressure when it is usually working. The pressure accelerates when the oil starts pushing itself out through those seals and gaskets. So when you start to experience such excessive oil leaks all of a sudden from your vehicle, be ready to take your car to the professionals to make it work smoothly. One of the Bad PCV valve symptoms that can show up in your vehicle was oil leaks.

The Untold Secret To BAD PCV VALVE SYMPTOMS In Less Than Ten Minutes

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Low Performance

Of course, PCV valve being so important for any vehicle, it will surely affect the overall working of the car. It will not shut down the vehicle entirely, but yes, you will see your car misbehaving. In case the valve is not closed properly, it will push oxygen into the combustion chamber. This mixes up the oxygen and fuel, which further pressurizes the exhaust. It can worsen the situation of the engine, and may even halt its functioning. Look for some effective maintenance tips from experts to make it work.

Polluted Filter

Often water vapors are pushed into the filter names as breather element, as pressure is buildup in the crankcase of the engine. This eventually leads to more consumption of fuel. This pressure combines water with the gas that can leave a deposit in the filter. Since the filter is polluted, one can’t expect the vehicle to run smoothly.

Other Symptoms

There could be several other symptoms including moisture inside the engine, black smoke from the engine, and even internal engine pressure. It could show up some more symptoms like a failure of one or the other gaskets. Hard engine start could also be another symptom if the valve is somehow stuck.

How To Test The PCV Valve Yourself?

It starts with a visual inspection of the vehicle and PCV valve as well. The first way to do this is by testing for vacuum. For this, start the engine and let it sit idle for a few minutes to warm up. Now open the hood, detach the valve, block the end with your finger, and watch it. Do you feel the vacuum at the tip of your finger? Besides, there will even be a drop in rpm. So, this is how you can test the PCV valve yourself.



Certain bad PCV valve symptoms that can show up in your vehicle were right above. We even discussed how you could check it yourself. So go ahead and check for these symptoms to make your vehicle run smoothly.

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