Crankcase Filter: Purpose, Signs It’s Clogged, and Other FAQs

Reading Time: 4 minutes

When your engine is running, the combustion pressure pushes unburned fuel and gases from the combustion chamber to the crankcase. They pass through the piston rings, where they could leak, resulting in blow-by gases and harmful emissions.

The positive crankcase ventilation (PCV) system prevents issues by recirculating the vapors to the engine’s induction system, which has cylinders that burn them. The crankcase filter is one of the system’s crucial parts.

What Does the Crankcase Filter Do?

The crankcase filter cleans the blow-by gases or escaped gases to remove contaminants from the crankcase ventilation. The process returns gases to the engine’s intake. The engine will then draw the gases to the combustion chamber to burn and prevent them from getting out to the environment as harmful emissions.

Where Is the Crankcase Filter Located?

The crankcase filter is usually on the breather hose on top of the crankcase. It could also be on the valve cover, depending on the vehicle.

car blue valve cover focused
The crankcase filter could also be on the valve cover, depending on the vehicle.

Symptoms of a Clogged Crankcase Filter

Dirt, debris, and other deposits can clog the crankcase filter over time. Here are the telltale signs that your vehicle’s filter is clogged:

Oil Leaks

A blocked or clogged filter builds pressure, which leads to blown seals or gaskets that cause oil leaks.

Rough Idling

Rough idling refers to excessive vibrations when the engine is running while the vehicle is not moving. It often occurs when there are oil leaks, as the engine isn’t performing optimally.

Black Smoke

The filtered contaminants tend to build up and block the passageway, preventing the filter from doing its job. As a result, the debris burns alongside fuel in the combustion engine, causing the vehicle to produce black smoke.

Poor Engine Performance

A clogged filter makes it difficult for air to pass through, causing issues with the engine pressure and an imbalanced air-to-fuel ratio. This leads to decreased power and acceleration when driving at low speeds.

Illuminated Check Engine Light

If the powertrain control module (PCM) detects any problem in the crankcase filter, it will illuminate the check engine light. Mechanics use a scanner tool to get the on-board diagnostics (OBD) code that indicates the issue from the system.

For example, if the tool logged a P1507 code, which means “Crankcase Filter Restriction,” it indicates that there’s something wrong with the filter.

Remember that other faulty parts can exhibit the same symptoms as a clogged crankcase filter. So be sure to cross-check the other signs or let a mechanic check your vehicle for a proper diagnosis.

Causes of a Clogged Crankcase Filter

If your crankcase filter is clogged, it might be due to the following:

Engine Oil

Engine oil can become thick and sludgy when it’s old or contaminated, which clogs the crankcase filter.

Dirt and Debris

The crankcase filter traps debris to prevent it from contaminating the oil. The dirt builds up over time, eventually clogging the filter.

Carbon Deposits

Carbon deposits are a result of incomplete fuel combustion. They create a wall of black soot that hardens and blocks the passageway.

Condensation

Moisture can build up in the crankcase filter, especially if the engine often runs at low temperatures. It tends to mix with other contaminants, which clogs the filter.

Why Is It Important to Clean the Crankcase Filter?

Keeping the crankcase filter clean helps maintain high engine performance. For example, if it’s clogged, it could cause oil contamination, resulting in sludging, engine wear, and power loss.

Can You Clean the Crankcase Filter Yourself?

Yes, you can clean the crankcase filter on your own, provided that you’re familiar with your vehicle’s PCV system and have the tools and know-how needed for the task.

When Should I Change the Crankcase Filter?

mechanic looks at car hood finding crankcase filter
Experts recommend changing the crankcase filter when it’s damaged or at least once every two years.

Experts recommend changing the crankcase filter when it’s damaged or at least once every two years.

How Much Does Crankcase Filter Replacement Cost?

The cost of replacing a crankcase filter ranges between $60 and $180. New filters cost $10 to $80, while labor costs can set you back $50 to $100, depending on the auto shop.

How Long Does a Crankcase Filter Last?

It’s best to replace the filter every 25,000 miles or every two years, depending on which comes first. The lifespan of a crankcase filter depends on the filter type and the conditions of the engine.

Some factors might accelerate the need for replacement, such as weather conditions and the frequency of oil changes. It’s also worth noting that some manufacturers have recommended filter replacement intervals.

Final Thoughts

If you spot the symptoms of a clogged crankcase filter, address them immediately to prolong and preserve your vehicle’s performance and prevent irreversible damage. Take your ride to an auto repair shop as soon as possible.

The post Crankcase Filter: Purpose, Signs It’s Clogged, and Other FAQs appeared first on In The Garage with CarParts.com.



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