Honda Accord PCV Valve Symptoms (9 Things To Be Aware Of)

You’ve undoubtedly heard of a gas/diesel engine PCV valve. Yet you probably didn’t realize how crucial this small plastic element is to your Honda Accord.

This little component is known to fail, and the issue happens in most gasoline engines on the market. Most PCV valves are constructed of plastic hoses that quickly wear down.

You may observe a variety of symptoms once it fails. Look what I found out about its different symptoms!

Honda Accord PCV Valve Symptoms

1. Your Check Engine Light Will Display On Your Dashboard

A check engine light on your Honda Accord’s dashboard is arguably the most prevalent and visible evidence of all malfunctioning PCV valve symptoms.

When the engine light illuminates, a fault code is recorded in the engine control module. An OBD2 scanner is required to read the problem code from your engine control unit.

However, some older vehicles with a PCV valve but no electronically controlled engine would not exhibit this symptom.

2. Rough Idle And High Idle RPM

Since the PCV valve regulates the airflow in the intake manifold and crankcase, a damaged PCV valve can produce similar symptoms as an intake air leak, causing the idle RPM to rise and other unusual idling characteristics such as highly rough idle.

Always inspect your Honda Accord’s PCV valve if you’re experiencing weird idling issues.

3. Rich/Lean Mixture

Due to the sheer concerns outlined, a malfunctioning Accord’s PCV valve might exhibit some same symptoms as your vehicle’s intake leak, resulting in an incorrect air/fuel combination.

Typically, your air/fuel combination would become lean, and you will experience the same symptoms.

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Rich combination, you can frequently notice that the automobile has a bit more gray/white exhaust than usual, and you can often smell petrol.

Lean mixtures are harder to discover, yet they frequently result in misfires, as we shall see later.

4. Misfiring

Because a malfunctioning PCV valve in Honda Accord might generate a complex lean/rich mixture, you may have misfires during both idle and acceleration.

If the mixture is excessively lean, the cylinders will not ignite properly, resulting in misfires.

Likewise, when you have an overly rich mixture, the gasoline might switch off the spark and produce a misfire.

5. Rough Acceleration

Rough Acceleration

When your Honda Accord’s PCV valve fails, resulting in an incorrect fuel mixture, you will notice harsh acceleration at low and high RPMs.

Most automobiles will not detect a damaged PCV valve at higher RPMs than idle, but it’s worth noting as it can happen based on the valve’s design.

6. Oil Leaks And Increased Oil Consumption

If your Honda Accord PCV valve or its hoses become clogged with moisture, the pressure within the engine crankcase rises, pushing the up pressure in the cylinders and then out through the gaskets.

If you notice multiple major oil leaks and excessive oil usage in your vehicle, check your PCV valve and the hoses that connect to it to ensure they are not clogged.

7. Black, Blue, And White Smoke From Your Vehicle’s Exhaust

When your Honda Accord’s PCV valve or hoses become clogged, the crankcase will force oil into the vehicle’s combustion chambers, causing oil to burn within the engine and exit via the exhaust pipe.

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It will produce a large amount of blue smoke from the exhaust system.

If the PCV valve is defective and enables the engine to run rich or lean, you may notice black or white smoke emerging from the exhaust pipe, varying based on the mixture problem.

8. Contaminated Filter

When your PCV valve breaks, an oil and hydrocarbon filter called a breather element may get clogged.

Increasing crankcase pressure drives water vapor through your breather element, causing this.

As a result, the water interacts with the gas, generating an accumulation and enhancing your vehicle’s fuel economy.

One method for evaluating this component is to check it for buildup physically. Another way is to calculate the fuel efficiency of your Honda Accord. If it drops quickly, your PCV valve may be failing.

9. Unusual Engine Noises

When your Honda Accord’s PCV valve or the valve hose breaks, your engine may start making strange noises. For example, you may hear a whizzing or whirring noise from under your hood.

Of course, this noise is caused by air escaping from your valve’s hole or valve hose.

So, make sure to hear out for unusual engine noises since an inconsistent noise almost always signals that something is wrong.

To know more, you can also read our posts on Honda Accord ignition coil symptoms, Honda Accord MAP sensor symptoms, and  Honda bad alternator symptoms.


Monitoring your Honda Accord PCV valve guarantees your engine runs at full performance, keeping you safe and saving money.

However, PCV system problems may be more challenging to discover if they are not connected to the valve.

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So, take your vehicle to a reliable technician for an inspection for proper judgment.

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