PCV Valve – Regular Maintenance – Why You Need It

Replacing a PCV valve isn’t difficult, but sometimes accessing it can be a struggle, depending on your vehicle.

The venting of crankcase pressure into the intake by the PCV system can cause significant carbon build up on the intake valves.

PCV Valve - Regular Maintenance
PCV Valve – Regular Maintenance

You don’t realize how important the PCV system-regular maintenance is until a failed PCV valve disrupts engine performance and internal components.

So, The objective is to redirect or recycle the engine’s blowby via sending it back into the intake.

Lack of PCV valve-regular maintenance can eventually contaminate the air intake with oil.

And, If blocked the crankcase pressure will build to a level that will create leaks and burn engine oil.

Every vehicle, regardless of type or application, must have PCV valve-regular maintenance in order to remain in good running condition.

Dangers Of Extended Oil Change Intervals

As a former engine rebuilder I believed there were only a few things that would cause any engine to fail.

  • Lack of proper lubrication
  • Contamination ( Dirt,Fuel,Coolant Ect. )
  • Excessive heat

Every vehicle, regardless of type or application, must have regular oil changes in order to remain in sound running condition. The real question is which interval will work best for your vehicle.

Engine Maintenance-Oil Change
Engine Maintenance-Oil Change

Oil is cheap compared to many unexpected repairs from lack of regular maintenance.

Synthetic oil is much tougher than conventional oil. One reason to use synthetic oils is their ability to clean the engine. Because of enhanced cleaning properties they actually get dirty faster.

Contaminants must be removed once the cleaning is done. Oil also has a limited capacity on how many particles it can hold. By not changing the oil, particles already in the oil will act like an abrasive. Because of this, the oil isn’t capable of providing the necessary lubrication for metal parts after an extended period of use.

Engine Oil Sludge
Engine Oil Sludge

Sludge occurs when old oil begins to gel or solidify in an engine. When sludge begins to build up, oil isn’t able to flow freely through the engine and can cause oil starvation to:

Your Engine Also Needs Clean Air To Breath, This Includes The PCV system

The same contaminates that damage your oil, Also affect the PCV system. You don’t realize how important the PCV system is to the well being of your engine until you see what it can affect:

  • Increase in internal engine pressure
  • Failure of one or more oil seals or gaskets
  • Engine oil leaks
  • Increased oil consumption
  • Moisture and sludge buildup inside the engine
  • Can trigger the “check engine” light
  • Engine surges and possibly black smoke
  • Lean air-fuel mixture
  • Presence of engine oil in PCV valve or hose
  • Hard engine starting
  • Rough engine idle
  • Engine misfires at idle

As you can see replacing your PCV valve is more important than you think.

General Instructions For Replacing A PCV Valve

Consult your owner’s or repair manual for specific instruction, As they are not all the same.

PCV Valves
PCV Valves

I prefer to only use OEM parts ( From the Dealer ) for this. Why you ask !

  • Not universal but made for your vehicle
  • More exact tolerances
  • Better quality
  • Always the same fit ( Had one that had an elbow that was in the way )

  1. So, Start by locating the PCV valve using your repair or owners manual.
  2. It’s usually situated on or near the intake manifold, or on the valve cover. The PCV valve is connected to a hose. Loosen the hose clamp and check the condition of the hose. Replace any cracked, pinched, spongy, clogged, or sticky hoses.
  3. Remove the valve. Some valves are held in place with a grommet and can be pulled free. Other valves need to be unscrewed by hand or with a wrench.
  4. Check the condition of the rubber grommet. Replace the grommet if it’s showing signs of wear.
  5. Screw in the new valve by hand or push the new valve into the rubber grommet.
  6. Reconnect the hose and secure the clamp.
  7. Finally, Start the engine and check for any oil or vacuum leaks.

PCV Valve-Regular Maintenance – Conclusion

Finally, If you have a bad PCV valve, PCV valve replacement could eliminate the problems listed above. Over time, oil breaks down and becomes contaminated with dust, dirt and debris from the engine as well as the environment. When that happens, oil can’t properly do its job.

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About Danny Bender 177 Articles
I have been into cars for as long as I can remember but the engine is what interested me the most. Now with over 40 years in the engine rebuilding and machine shop industry I have retired. I will be spending my time sharing what I have learned while keeping up with the latest Technology - Helping Solve Engine Problems !